Question about 1994 Chevrolet C1500
It sounds like the engine is pulling fuel from the tank, and not replacing it with air, causing a vacuum to build in the tank. The vacuum, may build to the point that it resists the fuel pump's efforts to **** fuel from it. If the vacuum is sufficient, it may collapse the tank, or expand the fuel enough for the engine manifold vacuum to **** raw gas into the evaporative emissions control system, hence the cannister.
Replacing the fuel pump, and filter will both break this vacuum, and make it run well for a few more miles, until the vacuum builds again.
The tank is usually vented to relieve pressure and vacuum through the gas cap.
Basically, sounds like a bad gas cap.
Try driving with the cap loose or removed. If that fixes it, buy a new cap. Preferably a locking one, as the amount of fuel these trucks hold is pretty tempting to less than honest folks. My 1990 C2500 has a 34 gallon tank.
Coil?? with the other symptoms, how'd you come up with that?
Posted on Apr 08, 2009
Sounds like you need a new coil get it checked its free. they sometimes stop workin when they get hot just before they die
Posted on Mar 08, 2009
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Posted on Jan 02, 2017
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