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Off the truck.... press the lever in. Hold your finger over the SUCTION side. Let go of the lever. It should hold vacuum as long as you keep your finger over the port (I just check for 15 seconds or so).

Ditto with pressure on the output side (you have to keep pressing in the lever).

All the pump is: rubber diaphram. Two valves (inlet & outlet). Valves held down by a small sping. Quite often I've pulled the pump apart, and discovered a piece of crud lodged into the valve that caused it to stop pumping. Clean out the crud, reassemble... worked fine.

Oh, obviously I like the early fuel pumps that you can disassemble in the field... later with crimped cans... still check the same way, but have to be tossed. :(

Tom :usa:
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