Re: double action fuel pump

Posted by Owen_Dyneto On 2011/4/8 18:36:21

As a generalization:

On the vacuum booster side of the pump, a couple of strokes of the arm should give and hold at least 14 inches of vacuum. If it doesn't hold the vacuum you either have a ruptured diaphragm or leaking check valve.

The fuel diaphragm is checked by output pressure, 3-1/2 to 5 lbs typical. And it should hold a vacuum on the inlet side and if it doesn't again you either have a ruptured diaphragm or faulty check valves.