You need to find a mechanic that has a "smoke machine" this is a machine that can introduce smoke into the system which will then leak out wherever the leak is.
You might also have a purge solenoid that has gone bad. This is sometimes that cause of your problem.

Answered by promechanic (expert)
556 answers provided

ck the dealer for bullitins to

Answered by cadieman (expert)
2,864 answers provided

look under the truck at the Charchol Canister it has a few vaccume lines coming and going and that is sensitive if any are dry rotted it will cause a leak in the fuel pressure system and throw a MIL light

Answered by tedwright
0 questions asked

I had the same thing in my 99 sport. I checked the char can and noticed I had a crack on the housing for my gas tank that wasn't very big but after throwing some epoxy on it. FIXED. Moral of story... Look around the canister and gas tank housing for any cracks. Mine was only about an inch big.

Answered by Norcal
8 questions asked