My 235 6 on my 55 2nd suddenly stopped working. this has been a complete frame off rebuild and I have a new double action fuel pump. The engine will fire off if primed but there is no fuel pumping. I checked all the fuel lines (they are all new) and everything up to the engine is clear. I've been driving the truck on and off for probably a couple of hours so the sudden failure is weird.

Question: Does the vacuum inlit on the pump need to be blocked off if not in use?
Any suggestions on how the pump could fail? I was going to open it up and see if perhaps something got stuck in there.


It's a work in progress! Started August 08. gotta finish before the baby comes August 20th!

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