Quote:
Originally Posted by BullF-16
Seems like its a check ball that is too soft and lodging internally. Its the check ball that prevents hot fuel to backflow thru the pumps and into the tank after shutdown.
When jumping the hobbs the 2nd pump is enough to kick the ball out and the car runs fine on the primary pump. Then shutting it down, the check ball that is too soft gets lodged again and limits the psi when the car is warm.
Let it sit 24 hrs (fuel and check ball cool and shrink) and it again runs fine until shutting it down, the residual heat in the fuel expands the check ball and it get wedged in the inlet again.
Anyway, Andy has been outstanding and is waiting for me to send it back into him free of charge. It seems there was a batch of units that went out long ago that has the out of spec check balls.
I have about 22,000 miles (3 years) on this set of pumps btw and its been able to feed the motor well.
FHRC
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Did you get this issue straightend out yet?. I seem to be losing my main pump but I haven't had the chance to test the secondary pump.