Quote:
Originally Posted by Kenth
There is NO suction going on in a mech fuel pump.
The pump creates a vacuum on the tank side of the membran and s pressure on the carb side.
Technically speaking it's atmospheric pressure that pushes the fuel from the tank to the pump.
FWIW
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TRUTH which is why tank vents that let air into the tank are so important.
In the old days you also had a vented gas cab that would dump gas on the race track, when the car launched,
and really piss off the track crew.
Much better to have proper tank venting lines and then you can run a a non-vented gas cap.
A lot of cars in the early days had a small restrictor in a looped line that went into the trunk
and back out to air under the floorboard. That started in the 1965/1966 time frame.
Tom V.