Quote:
Originally Posted by PAUL K
X 2!!!
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X3
When I got into about mid 12's the puller became an apparent impossibility. The fuel pressure gauge also told an interesting story after I switched to an electric pusher pump. I initially installed a Mallory 110. It's the same pump as the 140 except it has a lower pressure internal bypass spring (7 psi?). The 110 was initially set up with a deadhead regulator. The pressure was steady 6.5# during idle and moderate driving conditions. Upon hard acceleration, it would dip to 4#. Upon braking it would climb to 9#. So, I blocked the pump internal bypass and installed a bypass regulator and return line. Then it was rock steady 6.5# under all conditions. The inertia acting on the column of fuel is significant. Oversizing a supply line, in a deadhead system, can have diminishing returns. In a return system the inertial affect is offsetting. The suction line on a puller should be minimum to suffice.