Originally Posted by lewtot184
another thing to think about is adequate venting of the fuel tank. i did some tests on some pumps and an original hipo 440 pump pulled 19" of vacuum. in fact it pulled more vacuum than any pump i tested. if the fuel supply system isn't properly vented high vacuum in the lines can contribute to the fuel flashing.


Agree, tank venting is important.

I've seen several cars over the years that had the factory fuel tank venting altered and it caused the tank to pull a vacuum causing the car to stall.