Quote:
Originally Posted by blk95lumina
So it turns out my theory was right.
Somehow the small vent that resides inside the gas tank and is part of the fuel pump assembly vapor line became restricted and was not allowing fumes to vent from the tank.
The line was NOT clogged with any carbon, dust, debris, etc. and was completely clear all the way through the metal vent line on the fuel pump assembly. The carbon canister also does NOT have any restrictions or carbon in the lines, etc.
I noticed on the new fuel pump, the vent located on the metal vapor line has a small, metal ball bearing located inside the vent to prevent fuel from flowing out if the vehicle flipped over I presume.
On the defective 4yr. old fuel pump, there was not a loose metal ball bearing inside the vent. Maybe they changed the design or maybe somehow the ball bearing became stuck and was restricting the vent on the fuel pump assembly.
Anyways, new pump with a free flowing vent and absolutely no fuel tank pressure build up. I confirmed and tested each pump by blowing directly in and out on the new and old fuel pump vapor lines. I have also been driving the car for a week and checking the pressure by removing the cap after my drive home from work. Temps are also rising here in TX so it seems it is properly venting.
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so the fuel pump caused the pressure build up . never heard that one.
could be the vent line had a blockage but if it did it was a perfect seal.
I would think a kinked vent line or the canister .