Fuel Pump

[JimB]

Hey all. I am having fuel pressure issues. Early 87 4.0 (no resister) I was able to limp home yesterday barely made it. Put pressure gauge on. Turned key on 20PSI. Started engine slowly crept up to 31 psi. Held pressure. Shut engine off. Waited a little while, pressure slowly went down. Turned key back on, heard pump come on but no pressure increase. Started engine pressure slowly returned to 31.

I do not remember what brand or when I last replaced pump. I am sure it has been at least five years. The filter, regulator and lines were replaced recently. (Less than one year). Also noticed the low fuel light came on just under half tank. Gauge was reading between 1/4 and 1/2. Yesterday the gauge moved up to 1/2 tank. I have added a ground wire for the sending unit and pump years ago. Before I pull the pump, I want to get a new one. Having problems finding a Bosch. All local stores carry precision, Delphi. Really do not want to wait a week for a Bosch. Here are my questions. 1) Are Precision, Delphi any good?  2) Should I install a resistor? Sorry so long. After writing all this went out and pressure was still at 30. Started engine and watched pressure drop to 10 before engine died. 3)Any ideas?

[ghetdjc320]

I ran the precision for a few years. Good pump overall. I’d recheck all the grounds though and check the quality of the wiring and connectors to the sending unit. Cruiser has some grounding tips for the fuel pump iirc.