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CrownVic55 · 04-12-2021, 04:30 PM

You may have a restriction in your vent line on the tank resulting in a vacuum condition which sucks the fuel back to tank. Try removing the gas cap as soon as you shut car off and see if it goes down then.

04-12-2021, 04:30 PM	#4
CrownVic55 Senior Member Join Date: Mar 2013 Location: Collinsville, OK Posts: 171	Re: Fuel line check valve? You may have a restriction in your vent line on the tank resulting in a vacuum condition which sucks the fuel back to tank. Try removing the gas cap as soon as you shut car off and see if it goes down then.