How do we siphon gas contaminated with deisel from a 2001 Yukon Denali? Specifically, are there compartments or baffles within the gas tank that would prevent siphoning with a hose?

Asked by Dec 04, 2015 at 11:08 AM about the 2001 GMC Yukon

Question type: Maintenance & Repair

The vehicle has not been started so
the fuel pump has not been
contaminated.
The straps holding the tank in place
are pretty rusted and would be hard
to get off without professional help.
The vehicle has been jacked from the
rear so gas is likely pooling in the
front of the tank.
Estimates from professionals are
$300-400 to tow, drop the tank, flush
and refill with gas.

7 Answers

18,755

Dropping the tank and flushing is the best option. Those estimates are pretty good for that amount of work. You could look into a mobile mechanic, to save even more (you can find one on Craigslist). Option 2 is siphoning and diluting with good gas. Siphoning alone will never get all that contaminated gas/diesel out, but if you get most of it out, fill up with good gas, and add some high-octane gas treatment (for the next few fill-ups) your engine will survive. After all that is said and done, you'll need to replace the fuel filter and maybe run some engine cleaner through the engine as well.

1 out of 1 people think this is helpful.
18,755

Found this on the interwebs: http://blogs.tech-recipes.com/qmchenry/2006/10/13/what-to-do-if-you-get-diesel-fuel-in-your-gas-vehicle/

1 out of 1 people think this is helpful.
40,585

Siphoning fuel from modern cars is pretty much impossible. You may need to remove the tank or use the fuel pump to pump the fuel out. A small amount of diesel should not hurt anything.

1 out of 1 people think this is helpful.
40,585

How much diesel did you put in the tank?

35,145

Agree with Full of Regrets, how much diesel is in the tank? If it were 2 gallons or less I probably would fill the tank with gasoline and drive it. If there is more than a couple of gallons do some creative tinkering and use the vehicles fuel pump and pump it out. No need to flush the tank in this situation. Small amount of diesel won't hurt a thing.

2 out of 2 people think this is helpful.

A full five gallons. A horrible mistake involving using a gas can to store diesel and then forgetting. This model holds about 30. It already had about 5-8 gallons of regular gas in it. We got under neath and removed the hose from the mouth of the tank and were able to get about a gallon out with a common gas siphon but either the hose we are using is too thin, too short, or maybe it is looping on itself because we haven't been able to get any more out. That's why I wanted to know whether the fuel tank has internal compartments or valves or whether it is just one big open container. If the former, and we can't get to the rest of the deisel then the tank may have to come off. If the latter then we get a longer, thicker hose and try again. Thanks for all the help.

40,585

I believe there is an anti-siphoning device in the gas tank neck and there should be baffles in the tank itself.

1 out of 1 people think this is helpful.

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