To run a pump test you'd have to have a pressure gauge on yer line and while the engine is running the gauge would show if the pump is holding pressure. Least that's the way I've done it anyhow.

Last edited by TJ's Chevy; 03/16/15 11:43 PM.
1966 C10 292/tko600 http://67-72chevytrucks.com/vboard/showthread.php?t=596643
1964 C20 292/sm420