Screwed up big time
Thread Starter
Heel & Toe
Joined: Apr 2021
Posts: 21
Likes: 5
Screwed up big time
Was going to work and not paying attention when I filled 5 gallons of diesel in my ls2 c6 corvette.
I then topped it off with 10 gallons of premium and drove it like 4 minutes.
what should I do ?
get it towed and cleaned out or just drive it ?
or siphon the fuel myself with a pump. I drove it very little with this mix of fuel.
thanks and sorry guys won’t happen again
I then topped it off with 10 gallons of premium and drove it like 4 minutes.
what should I do ?
get it towed and cleaned out or just drive it ?
or siphon the fuel myself with a pump. I drove it very little with this mix of fuel.
thanks and sorry guys won’t happen again
Last edited by maurihermoza; Jun 25, 2024 at 02:56 PM.
Popular Reply
Jun 25, 2024, 10:49 AM
Le Mans Master
Joined: Dec 2013
Posts: 6,337
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From: Charles Town WV
2024 Corvette of the Year Finalist - Modified
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Unhook your fuel line at the firewall, find a container to pump it into, run a rubber hose from the fuel line to said container, then do a key on engine off, jump the fuel pump relay at the fusebox and pump it out until its dry.
I gotta ask though? How? Theres alot of steps you have to go through to select diesel at the pump.
I gotta ask though? How? Theres alot of steps you have to go through to select diesel at the pump.
Melting Slicks
Joined: Jul 2019
Posts: 2,004
Likes: 848
From: FL Keys
2025 C5 of the Year Finalist - Unmodified
If possible, siphon the fuel out as much as possible and fill it up with 93. If you only drove 4 miles very little even got to the engine. Good luck.
Le Mans Master
Joined: May 2005
Posts: 7,913
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From: Cypress TX
You're going to need to drain and flush the system. Remember that these cars essentially have two fuel tanks that are connected with a crossover tube. Diesel is thicker and doesn't burn near as fast as gasoline. If you continue to run it, bad things can happen (injectors, spark plugs, fuel pump, fuel filter, etc.). On the bright side, it's actually a lot worse to run regular gas in a diesel engine. At least you don't have to worry about blowing up your motor. Good luck. 
Le Mans Master
Joined: Dec 2013
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From: Charles Town WV
2024 Corvette of the Year Finalist - Modified
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Unhook your fuel line at the firewall, find a container to pump it into, run a rubber hose from the fuel line to said container, then do a key on engine off, jump the fuel pump relay at the fusebox and pump it out until its dry.
I gotta ask though? How? Theres alot of steps you have to go through to select diesel at the pump.
I gotta ask though? How? Theres alot of steps you have to go through to select diesel at the pump.
Melting Slicks
Joined: Oct 2022
Posts: 3,339
Likes: 1,934
From: Ulta Vista, AZ
I feel like of have heard of people running it out and being “ok”
I personally would not want to take that risk and would drain it.Aren’t the diesel pumps bigger nozzles that they cannot fit in a standard filler neck?
I personally would not want to take that risk and would drain it.Aren’t the diesel pumps bigger nozzles that they cannot fit in a standard filler neck?
Le Mans Master
Joined: Dec 2013
Posts: 6,337
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From: Charles Town WV
2024 Corvette of the Year Finalist - Modified
2023 C6 of the Year Winner - Modified
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Maybe less than a gallon, 5 gallons no chance, bad thing is the damage may already be done. Injectors are probably toast.
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Race Director
Joined: Jun 2013
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From: DFW TX
I would say this - then fill it up with premium & run it.
Le Mans Master
Joined: Dec 2013
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From: Charles Town WV
2024 Corvette of the Year Finalist - Modified
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Thread Starter
Heel & Toe
Joined: Apr 2021
Posts: 21
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Just too distracted
been working with my dad filling diesel trucks and then I was just foggy this morning and went into automation mode. I didn’t even notice the nozzle being different. Honestly feel awful about it. It got towed to a shop for free via road side assistance and they will fix it up for me .
Race Director
Joined: Oct 2012
Posts: 17,377
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From: Melbourne, FL
been working with my dad filling diesel trucks and then I was just foggy this morning and went into automation mode. I didn’t even notice the nozzle being different. Honestly feel awful about it. It got towed to a shop for free via road side assistance and they will fix it up for me .
Le Mans Master
Joined: Dec 2013
Posts: 6,337
Likes: 5,115
From: Charles Town WV
2024 Corvette of the Year Finalist - Modified
2023 C6 of the Year Winner - Modified
2022 C6 of the Year Finalist - Modified
you win Covette Forum today sir
Thread Starter
Heel & Toe
Joined: Apr 2021
Posts: 21
Likes: 5
Thread Starter
Heel & Toe
Joined: Apr 2021
Posts: 21
Likes: 5
Melting Slicks
Joined: Dec 2003
Posts: 2,340
Likes: 722
From: Chicago N/W Suburbs
What residual diesel fuel remains inside, should not harm the vehicle systems. Just burn it out using 93 octane gasoline as the flushing agent. I would then run down the tank until the fuel warning light comes on, then repeat once more. And don't take your time doing so. Use your Corvette as your primary vehicle to burn through two tanks of 93 octane in a timely manner.
Like it was mentioned, burning a gallon of diesel with a full tank of gasoline might be okay, but 4 gallons is surely risky. You just might be okay, but I would not take the chance.
I wonder if diesel fuel will naturally mix with gasoline, or if the two fuels will separate like water and gas. Hopefully they mix well so the car does not experience 100% diesel at any given point.
Last edited by Ron Dittmer; Jun 25, 2024 at 02:30 PM.
Pro
Joined: Apr 2022
Posts: 523
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From: Stevens Point, Wisconsin
I think I've even heard of people putting 10% ethanol gas in their high end car by mistake and had to get the system flushed. Opposite of cheap, we're not talkin about a radiator and a garden hose.
