This Guy I no might have taken out his injection pump but idk what the fuel pressure of the pump at an idle with a stock lift pump. The trucks a 93

Thanks again Mike

 

Pump, pump, and another pump; I think you are asking what is the normal pressure of the stock diaphragm lift-pump at idle.

If so, a healthy pump will register between 4- and 7-PSI.

I have seen them as low as 2-PSI.

BUT, you can have a completely dead diaphragm lift-pump and the truck run the same; in fact, there are many of these old trucks that have been running around on a dead lift-pump and the driver none the wiser.