Idiot boyfriend put GAS in my DIESEL. Help!?

Expect the worst and hope for the best.

You'll probably be fine, but expect to pay for it.

Ps, get a new boyfriend that can tell his ass from his elbow

Sounds like you’ve got a girlfriend.

Time to get a new boyfriend

This is borderline , could go either way.

Be thankful the engine didn’t grenade itself yet because CR for diesel is so much higher than gas and gas in a diesel engine is a big no-go.

Best case scenario- you will need the full fuel system back to front flushed, new fuel filter, pump, the whole set.

I don’t think you need a new engine but you need it fixed asap. Gasoline has evaporative emissions (gas vapors leak very tiny amounts through injectors and into the combustion chamber).

The gas needs to be dumped out asap.

Others will chime in and contribute more to this I hope.

EDIT: $2000 for the drain. The fuel system including the Bosch CP4 and everything upstream of it could be $4-6000 depending on the truck? Please feel free to correct these figures.

Bottom line - expensive repair job and at any cost, DO NOT TRY STARTING THAT TRUCK.

you got a girlfriend miss 😂 but in all seriousness you should be fine. drain the tank. change out filters. add some additive it’ll be fine. i’ve drained full fuel tanks of DEF and had some lucky customers back on the road. however someday that CP4 will crap the bed unless you CP3 swap it.

I did this because the station had green gas handles. 22 gallons of gas in my duramax. I siphoned the tank, the gas sits on top of diesel. Filled the truck with diesel and it has been fine since.

Happens all the time, all day, all around the world. All you gotta do is say "gas in diesel" to the tech at the shop. They aren't even going to bother to get 100% of the gas out. Just most of it. They'll change the fuel filter and send you on your way.

[GIF] 

I think this is your only option with them..

While I’m not a Chevy man I can tell you that where I work when dopes do this which happens quite a bit we drain and clean the tank and replace the fuel filters. I wouldn’t think you’d need a whole engine for that by any means. Could be wrong, happens occasionally. Still gonna hurt. And hell if I’d pay for it if it was me that boyfriends paying for it and idc what he has to say about it lol

This is why everyone with a newer diesel needs to get a locking gas cap that they are the only ones that have the key to

So I have had about 100 rigs towed in over the years with gas in the tank. Drain it all out, I usually drop the tank to get it all out. Blow out fuel lines, new fuel filter. Put diesel in and boom that’s all it ever takes. Not a huge issue but it sure happens about once a week I swear.

Tell the shop you'd like to start with flushing the tank and changing fuel filter. Put 5 gals of diesel in the tank (because if that doesn't work then you didn't waste 25 gals of diesel) if it doesn't run smooth after about 5 miles of easy throttle driving, then get the rest of the fuel system replaced. If the engine was going to be shot, it would have blown up on the way home. Good luck. Don't let your BF fill it up again. Although I doubt he'll make the same mistake twice.

If I was you I would call a good diesel shop near you and talk to them. some parts will have to be replaced and it will cost you. Also check with your insurance provider, they way cover part of the repair. But above all else don't try to run it anymore until you get that gas out of your truck's fuel tank.

Sometimes your insurance will pay for it. You probably need to check with them

You’ll need a fuel system. That sucks.

Different truck but I had a similar situation. My cousin filled my 5.9 Cummins with gas. Empty tank 50 miles.. truck was fine after drain. 40,000 miles later still no issues

• Siphon out as much of your tank as possible.
• Refill with diesel.
• Continue driving and stop worrying about it.

One of the ways to make winter-blend diesel is cutting regular diesel with gasoline.

Learned that trick from New Yorkers up in the Adirondacks.

I did this over 20yrs ago with a 7.3L powerstroke. Station had different color handles than everywhere else. Made it a few down the highway and black smoke went everywhere and lost power. Had it towed home. Dropped the tank and drained it. Cycled the full pump and drained the fuel bowl several times after refilling with diesel and away I went. Still have the truck and it runs great. Never repaired anything involved with fuel system until recently when fuel pickup disintegrated in the tank.

It's fine, drain it at the filter and refill.

Ah, I did this last year on my brand new truck!

I can laugh about it now.

What I did, is I disconnected the discharge hose from the fuel pump to the first pipe it connects to.

I added an extension hose so that when the pump activates, it'll discharge into a 5 gallon bucket.

I found the terminals inside the plug harness to the pump and connected two wires to the terminals that power the pump.

I used the truck's own fuel pump to empty the tank.

I kept adding diesel while the pump ran and now everything is working great!

I didn't start the truck when I realized what I had done, so.....you may or may not be able to save your motor.

Not looking great. Make your ex-boyfriend pay for it

So you’re single now?

Insurance company will cover it. According to my agent they pay these claims on a regular basis in excess of $15k to replace the entire fuel system.

sounds to me like in addition to possibly replacing a fuel pump, time to replace boyfriend as well. Plenty of fine fellas in here. If it were me, I'd try to drain most of it, mix in some diesel and a little automatic transmission fluid to thicken it back, up, crank a little to get the gas out of the lines as much as possible , and fire it up. Gas has a hard time igniting because it actually has a HIGHER auto ignition temperature than diesel, which is sort of counter intuitive. That's probably what's going on here. Old military vehicles can burn gasoline in their diesel engines (like a deuce and a half)

This reminds me of a aircraft maintenance company that I used to work for.

I went to this one newly acquired site. I had to drive to a meeting about two hours away and I borrowed one of the company trucks.

Now if you know about aircraft maintenance, you know that jet fuel has to be pumped out of the tanks before moving into the hangar for maintenance and that this fuel cannot go back into the tanks again.

So I get i this truck and start it. Seems odd. I drive to the fuel station and pull up to the diesel pump. No diesel markings. I then spent the next 15 minutes just confused as all hell by the manual and my eyes and ears were telling me. It just made no sense at all.

Turns out the damn crooks that were running the place purposely bought gas engine trucks so that they could make use of all the jet fuel in their personal vehicles, boats, etc. They couldn't even limit themselves to the fuel the company vehicles couldn't burn.

Def got a girlfriend

There's nothing you can do about it at this point but not drive it, not try to start it, and get it to a mechanic.

The internet is right - hope for the best, but plan for the worst.

Since there WAS diesel in the tank and he only drove it 5 miles, the fact it stopped it might be fine. Diesel lubricates the injection pump and injectors. Also, gas doesn't compress so the alternative problem is that the engine hydro-locked and bent rods.

That said - that's worst case. Mechanics deal with this all the time. They will empty the tank, flush the lines, and bleed the system. If the engine runs after that, you're probably fine.

Be sure to have the oil changed since it's 100% certain that the fuel leaked down the rings and into the oil. So don't avoid that step.

Good luck and post back!

I love all the "you have a girlfriend" comments implying girls are too stupid to know the difference between gas and diesel ... TO A GIRL

My experience is with a power stroke but we’ve had the same truck filled 1/2 tank of more with gas by new employees about 3 times now(BP and Sun-Do stations suck) We’ve drained the tank by sending fuel out through under hood filter line and filled with diesel out of fuel cans, then replaced both filters. So far so good, but the truck only has 50-60k on it by now. I’d bet you are probably good, more so if you could drop the tank yourself of get a jiggler pump if your tank does not have an anti siphon device in the fill neck.

Don’t try to turn it over anymore. Drain the tank. Drain the fuel lines going into the motor. Fill her up with diesel and start it and let it idle for a while. It should be okay. Diesels are pretty tough.

$3800 to fix a bad diesel issue for me. Drop and drain tank, replace filter. Did it at the dealer since it was still under warranty at the time.

According to Niki Santoro’s advice in Casino: dig the hole first, that way, if anyone catches you, you’re just digging a hole….

I have a 7.3l diesel so not sure if this would apply to modern diesels.

I would drain the tank fully and all lines that can be removed. Then pour 3 gallons of diesel in the tank. Turn key to auxiliary to run fuel through lines. Then drain again. Then put 3 more gallons of diesel in and see if it starts and clears up.

I have weird anxiety at dual pumps with diesel and gas. I know I’m getting gas and it’s the gas pump but like what if I make the mistake somehow. I always be thinking my body is gonna do some wild shit lmao

I love all the dudes on here who can barely change a tire going after this dude for a mistake, saying he's somehow inadequate. My boss used to keep diesel and gasoline in almost identical containers. I put some gas in the tractor once and ended up having to drain the tank and bleed the lines. I learned a lesson, the tractor was fine. Give a little grace, our boy was trying to help, and he just got ahead of himself.

To be fair... The cp4 - high pressure fuel pump is a ticking Time bomb. They already suffer from the lack of lubricity in the United States diesel fuel. The gasoline that was pumped through that probably accelerated its demise. I would think about replacing it soon anyway.

If that high pressure fuel pump grenades it turns an expensive maintenance procedure into an extremely costly fuel system replacement.

I also have a 2016 GMC Duramax. My CP4 pump went out in 2021 at 45k miles. Then 3-4 months later my wife filled it with gas and left it running while she fuels it up so it died and has gas ran through everything. Cost me $3k to replace an already brand new fuel system that the warranty paid for from the CP4 pump going out.

LMAOOOOOOOOO, usually the other way around happens....

I did that to my 05 cummins years ago. After the shop flushed the tank and the lines and costing me about 600 it was fine. I drove it a few miles before realizing what I had done.

Comments arent showing up here either. There's something going on with reddit right now it seems.

Don’t run it anymore just take it in and they will flush it and hopefully you’ll be fine. Unless you’re competent at doing it yourself.

No need to prepare for the worst.. just expect the best!

😂😂😂😂😂😂😂

i don’t understand how people accidentally do this when you have to select which octane of gas.

so it’s 3/4 full of gasoline? have it towed to the mechanic and let them have at it.

Drain your tank, replace fuel filters, prime fuel filters according to manufacturer specs, turn it over and send it. Don’t hold it against him. I had a buddy put premix in my mower one time. Stuff happens and life is too short. It will be okay.

Here’s your red flag, doing something this ridiculously stupid is called foreshadowing.

You could try sucking it all out and see what happens as for your car, just add more diesel.

Seems like your boyfriend is the girlfriend as in how tf does he put in regular gas in a DISEL truck that his Gf drives

It depends on how much fuel was in the tank before the gasoline was put in?

Uhm the high pressure pump is what I'd be worried about. Gas is a solvent and diesel is a lubricant.

I had an m2 with an isb yesterday two full tanks of gas completely drained the tanks flushed the lines changed the filters it was fine i would start with that and try it gonna be a decent amount of work but filters are cheep just be glad it wasn’t def in the diesel

I’ve seen it several times in 30 yrs drop tank empty it since your there if you don’t have a lift pump And it’s a lml I’d put a fleece tank lift pump in seems adding a pump is helping the cp 4 last longer. Blow everything out put new filter on prime it let her go. I know there’s all the back lash on the cp4 issues it is a concern as stated most are because of poor fuel system maintenance. We specifically work on about 80 percent dmax we have seen more issue with cracked pistons by a large margin then blown cp4 to the point I won’t even buy one to put on our lot

shouldn't be an issue. get it drained, flush the fuel system with clean diesel. fill it up and should start and run just fine. see stuff like this come through my shop more often than youd think

Depending on the motor it’ll be fine, had a guy do this to a 5.9 HO and mechanic told us to just dump a quart of 10w in the fuel tank and it was good to go. Not sure if the duramax or 6.7 are as tough though.

Completely drained the system change the filters put 10 gallons of diesel in. Let the pump cycle for about 25 ignition cycles drain the tank, put in fresh diesel pray for the best most important thing is you have to get the gasoline out of the lines.

I went through this in my 2012 Duramax. It’s not the end of the world as long as you get all of the fuel out of the lines I recommend dropping the tank so that you can get every drop out.

Flush the tank definitely, a little bit won't hurt but if it was filled from a quarter tank it will kill your motor

Ur fuqqed

Until someone gets in there and looks, all we have is speculation. Honestly, it can go either way, not to mention there’s also potential damage to the EAS system. You didn’t say anything indicating that he experienced detonation misfires (from premature combustion), so that’s a hopeful thing there. If that’s the case and not something which happened that he neglected to mention, I wouldn’t expect the engine to be trashed. Fuel pump, perhaps. One of the functions of diesel fuel is to lubricate, whereas gasoline is a solvent. Five miles can be a variable. If we’re talking five miles in a city in stop and go traffic, that’s not the same as five miles on a quiet country road.

Engine isn’t destroyed but everyone that says drain and fill the tank is dead wrong the 11-16 HD had CP4 fuel pumps in em it needs a decontamination kit, all new lines, injectors, pumps, filters, drain and fill tank. Idk how much on the Silverado’s but it’s about $13k on the powerstrokes (from a dealer) aftermarket diesel shop will probably do it cheaper but still use OEM Decon kit the aftermarket kits are shit

Check YouTube videos how to flush the system. It's easy and will save you 1000$/s of dollars.

I’m heavy duty mechanic. If you don’t not know what to do. Tow the truck in. You will wipe out the fuel system, which is a very expensive repair

If it was just a little, it probably wouldn't be much of a problem, just fill it the rest of the way with diesel and it would probably be okay, but if he put in a lot or even filled the tank completely, it could easily cause problems.

First of all where are you located? You should seek to get a mobile mechanic drop your tank and clean it replace the fuel filter and then try it. If it doesn’t work then there is something else wrong

I hope your boyfriend has a few thousand dollars

Your probably screwed, but you might get lucky. If it were diesel in a gas engine it would be hosed for certain. Depends on how much diesel you had in the tank. If it was really low on diesel you may have some damage. You can use some gas in a diesel in cold months to prevent jelling. But not a lot. Diesel engines are built to take a beating and are somewhat tolerant to the point where they will run on almost anything. Seeing as how this is one of the electronic controlled engines, a sensor may be toast. The not starting part is most concerning from my point of view. I'd just have it towed to a very reputable shop. Don't screw with it yourself. If it's broken badly, you aren't going to fix it.

Not a big deal. Literally hundreds of people do that every day. The truck shuts itself off. Just gotta drain it. Sometimes they have green e85 pumps. Accidents happen. It’s happend to almost everyone I know over the years

This MIGHT NOT BE A BIG DEAL!!! How much diesel fuel was in the tank when he filled up? A mixture will not kill the fuel pump instantly, well not as fast as straight gasoline. If there was still diesel fuel in the tank, I would venture to guess that it just needs to be drained and replaced with legit diesel fuel. You might have dodged a bullet. Straight gas is 1000 times more damaging than gas mixed with diesel. I hope your okay. What dude doesn't know the difference between gas and diesel? You sure he ain't a girl? Pull that man card!!

He do that shit on purpose? That’s pretty fucking hard to mix up

I used to be a fleet mechanic and we had stupid guys fill diesels with gas on a couple of occasions. Worst one was the guy drove 30 mins north to plow some roads. Worked it till the truck shut off. Got it back to the shop and I drained the tank, refilled with diesel and surprisingly that truck is still going. This was on a 6.4.

You might get lucky with a drain and fill. Fingers crossed for you.

Edit: also changed filters. Can't neglect that

Easy get new filters , Attach fluid transfer pump at the tank side if the filter by the fuel tank . Suck out all the gas depending on your vehicle you might have a tank drain. Then add diesel , Highly unlikely it’s damaged but the one thing is you need to come to terms with the fact that you need a bf that wears pants and knows the difference between gas and diesel. Oddly this happens a lot usually it’s the gf that makes the mistake. Very rarely does it affect the fuel pump unless you have some other issues.

Drain the tank. You’ll be fine.

I’m going to guess you’ll be fine. I’m friends with a fire department mechanic and he said that on brush fires in a pinch they will put gasoline in the rigs and add a quart of oil to it and it will run. Not sure why he would lie about it. Meaning mixing gas and diesel and driving 5 miles should be ok.

I've seen this when I was in the army way back when. The young guys that came from cities didn't know the difference between gas and diesel fuels for trucks. There was an incident where 2 pick up trucks our unit had rented were totally killed because of that. The country boys were laughing their ass off over it all.

If it was running when it shut off your fine. Don’t go to the mechanic like u did on Reddit or they will soak you. Just have them drain the tank and change the fuel filters. You can add 1 gallon of gas to a diesel tank and it won’t hurt the engine , so like i said, just drain the tank and change the fuel filters. About $500 plus a tank of diesel. I would fill the front filter with a can of liquid moly diesel purge before you start it the first time. Good luck. Hope you have an honest mechanic, they r rare.

if it has the bosch CP4 HPFP you will likely need a new HPFP as the lubrication of it is very important.

As you've seen by some good posts...you are "probably" ok???? Keeping your fingers crossed. Hopefully your male girlfriend didn't use much of to go pedal and the gas didn't get sucked jnto the pump and lines and injectors until pulling into the driveway.

Engine itself is gonna be OK, worst case....CP4 is F'd, it's already got 8 years on it, might be on its way out even before the man child put gas in it. Also fuel rail can be contaminated with metal shavings as well as injectors clogged and F'd too. That's worst case.

He didn't drive far.. You still had 1/4 tank...you might get lucky with fuel system drain/flush/filters....

On a side note...where to I apply for the new boyfriend position? (I can see it already, nice Prius bro 🤣...my GIRLFRIEND a Duramax...)

Good luck, may the organic dinosaur juice gods smile on your fuel system.

Unusually it’s the opposite sex you hear about 🤣🤣🤣🤣

Happened to me 2 times the idiots pump fuel for a living and screwed it up. I got lucky and never ran it but the gas eats the components in the tank so they need to be replaced

Old BPs still have green handle gas pumps

The boyfriend is clearly not the boyfriend lol

Just drain the tank and put diesel in. Worst case scenario you’ll have to replace the fuel pump and/or fuel filter. Dont kill your battery trying to diagnose it (I had water in my tank and a dead battery makes fixing it 10000x worse)

Boyfriend probably pays shops to change air filters

gm tech here, the cp4 high pressure fuel pumps on these are very picky, it's likely that the pump is wiped and you will need an entire fuel system, including HP pump and injectors. I feel for his wallet cause it's gonna be an expensive lesson.

Remove the gas. Add diesel. Forget about it.

You need a new boyfriend

Put some oil in it and burn it

If you’re driving a diesel, you definitely need to step up to get a man and lose the little boy!

How aren’t the entry points for disel and gas cars sized different, how did he fill it?

If it won't turn over it's a dead battery or dead starter.

5 miles should be fine. I had to drive around 20 miles when it happened to me. Drop and clean the tank, replace the filter, and refill it with diesel.

I know cause my child grabbed and filled my diesel with gas. I was a wreck. Good luck. Hoping the same happens for you.

How many miles are on the truck?

Definitely go find a real man because no one makes this mistake but women😂😆

I believe the Duramax uses a CP4 pump. If so the pump, injectors, and the rest of the fuel system is going to need replacement and the tank and remaining lines, filter housings, etc. Will have to be flushed and cleaned.

Pull the fuel filters and look for glitter, if you find any you're looking at probably $10k to $14k in repairs.

Fire the boyfriend (but not before he pays for the damage).

I got secondhand embarrassment just reading this. Obviously don't drive it, tow it to a shop and hope for the best/expect the worst.

Out of curiosity, what does the gf...uh, I mean bf drive? I get that most Silverados have a similar look but even the fuel cap will say Diesel Fuel Only. Here's to hoping a good flush and a fuel pump/filter change is all that's needed, good luck OP.

Does insurance cover this?… they typically cover stupid…

Diesel engine, makes diesel sounds, smells like a diesel truck. What a clueless boyfriend.

Updateme

I accidentally did that same thing to my son’s 04 Silverado diesel truck. Drove it home and then couldn’t get it to start. My mechanic took it in after I had it towed, dropped the full fuel tank and drained all the gas out of the fuel system that he could. Filled it up with diesel, started it right up and charged me $500.

Insurance claim might save your butt

Had this happen to my 24v 5.9 Cummins. $12,000.00 had to rebuild the engine. Rings were broken on the front two cylinders. Blow by blew out the side cover gaskets and the it dumped engine oil out the side until the low oil light came on along with low oil pressure warning.

I've seen an independent shop handle this on 2018/2019 Ford for $1800 (this was about 5 years ago). No engine damage.

Learned the hard way yesterday morning at my 5:30am fill up that BP stations green handled pumps are regular gas and the black ones are diesel. I only put 2.5 gallons in it, before catching that mistake. I then topped the tank off with diesel, and every 30 miles I’d stop again and fill it up. It cranked wonky several times, but after filling it up again this morning the F350 is healthy again.

So kids the moral of the story is - be aware the green handle is not always diesel.

It will be about 10-15k for stock replacement parts. Just to give you an idea You can get a 700HP built short block with AF cam and aftermarket PPE cast iron heads for around 15,000$ with gaskets and studs it ran around 17,000$. I did not use them so I cannot speak for quality but if you have to replace stuff DHD has good options. I think they have a remanufactured long block for like 12k

Damn usually this is the other way around . Get a new boyfriend

He knew what he was doing...he wanted you to go green and get a prius.

Tell him you're not a lesbian and go find a real man. 😅

Coulda flushed and drained it yourself and saved 900 bucks!! Thats robbery

You still respect your boyfriend? You don't respect yourself.

Dude is a real weakling, not knowing he's driving a diesel and then just dumps a bunch of gas into it. Jesus Mary and Joseph..

Time to educate your boyfriend on how to read? Maybe get him some ADHD medications?

I wonder if he understands the concept of glow plugs or a grid heater?

I had the same thing happen to me with a Mercedes-Benz diesel engine, the pump I pulled up to was at a full service station; I parked and got out to used the diesel pump. The attendant came by and ushered back into my vehicle. He then proceeded to pump gasoline into the tank, until I yelled "Stop! It's diesel!". Luckily it was only 7 litres.

If you want a new boyfriend let’s get together, any woman who drives a diesel needs a real man.

Any damage needs to be paid by your “ex”. He knew he fucked up.

I can tell that you respect him because you call him an idiot right out of the gate.

It'll be fine.... had a buddy do the exact same thing 10 years ago, still have the truck and it runs just fine..... it's a common mistake. Give the BF a break.... his intentions were genuine... and I'm almost certain he won't make that mistake twice.

You may not need a new truck, but you do need a new boyfriend.

First: dump the boy friend! Second: make sure he pays for the work and Think seriously if you this dolt in your life!!

Just add some 40w to the gas in the tank. You'll be alright

Time to trade in?

Engine should be fine but definitely get rid of your girlfriend and go find a boyfriend.

IN HIS DEFENSE I did this once. It was 6 am and I was on my way to work. Went to a BP where they had green pumps for regular gas and black for diesel, where everywhere else has the opposite. I was half asleep and not paying attention but I still blame BP.

Get a new bf

Hope it’s all good 👍

Get an extended warranty and hope your mechanic does use car facts.

Wow so many people insulting the bf and asking OP to dump him? Over a mistake? Ooook.

What's your boyfriend's name ? Becky ?

My fiancé drove my 6.0 powerstroke and hasn't filled mine with gas thank goodness but she loves it thou accept now it's sitting in my driveway with shavings from the turbo and clogged injectors the shop I took it too told me 6 grand to fix it but I have great compression so I probably need a new turbo and flush the fuel system and just do a basic rebuild on mine witch will be cheaper 3500 bucks

Yeah I mean get rid of your boyfriend immediately and your truck ASAP. Thing is a goner. 

Purdy sure he knows what the green thingies are for at the gas station now, 👌 Glad to hear it wasn't so bad. So What you're saying is, I was right 😉

Your boyfriend sounds like a girlfriend. You should probably get him checked out along with the truck…

You'll be making him pay for repairs, right?

Pretty bold statement thinking he would pony up for a $22k engine redo...big diff from $900

Sorry to hear about your girlfriend

Your engine is most likely fine. It's they high pressure pump that goes out sending metal into the whole fuel system. If it ran till dead, it's a time bomb. The fuel system is expensive. If it's running, you might want to concerter trading it in.

Man card revoked.

I have a idiot brother who did the same with my truck no long term damage

Just stop. It won’t start? Tow to dealer. Gird your loins. Get a lawyer.

The pump doesn’t fit?

You don't see a girl with a diesel very often.

Breakup is the only answer