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Often the relay is controlled by the fuel pressure sensor. Not sure what you model is but its usually at front near pump. Its there as a safety device and to stop lift pump after it has done its job.Try bridging its terminal for a test.
the oil pressure sensor has a 3rd wire which feeds to the fuel pump .. If you turn the ignition key on and do not hear the fuel pump running for 5 seconds, replace that oil pressure sensor. That sensor does turn the fuel pump circuit off once oil pressure is acheive and the the computer switches the fuel pum relay on to take over running the fuel pump
there is not a fuel pump reset. but there is a fuel pump relay toyota calls it a circuit opening relay it is behind the right kick panel above the ECM, power comes from the ECMwhich gets its power from the ECM main relay.
Underhood fuse block swap out relay #7 thats the ECM relay. Ground Circuits Using a DVOM, touch negative voltmeter lead to a good ground. Touch positive voltmeter lead to each ground terminal. With vehicle running, voltmeter should indicate less than one volt. If reading is greater than one volt, check for open, corrosion and loose connection on ground lead. See ECM GROUND LOCATION table for ECM ground location. Page 1 of 1 SYSTEM/COMPONENT TESTS - 2.6L EFI -1994 Isuzu Rodeo
Your have a Fuel Pump A Control Circuit /Open try these possible solutions. Using a OBD II scan tool. Free use at Autozone. Check operation of fuelpump. Remove the glove compartment. Turn the ignition switch to ON. CHECK: Connect terminal FC of the ECM connector and the body ground. Check for the fuel pressure in the inlet hose when it is pinched by hand. OK:There is pressure in the fuel inlet hose.At this time, you will hear a fuel flowing noise .OK. Check for starter signal circuit Check for ECM power source circuit, if no good Repair or replace.OK Check circuit opening relay, if no good Replace circuit opening relay.OK. Check voltage between terminal FC of ECM connector and body ground to do this Remove the glove compartment Turn the ignition switch ON. Measure the voltage between terminal FC of the ECM connector and the body ground OK: Voltage: 9 – 14 V OK. Check for open in harness and connector between EFI main relay (Marking: EFI) and circuitopening relay, and circuit opening relay and ECM. Check fuelpump, if no good Repair or replace fuelpump.OK. Check for open in harness and connector between circuit opening relay and fuel pump, and fuelpump and body ground, if no good Repair or replace harness or connector.OK Check and replace ECM. Good luck and I really hope this solves that problem you are having. Please rate me. If you need further assistance you can always ask me.