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You are watching: Isuzu rodeo fuel pump reset switch


I"m helping my neighbor with his 95 Rodeo with the 3.2L engine. He replaced the fuel pump which wasn"t the issue. The pump won"t run when you turn on the key. The fuse and relay from the box mounted on the fender well checked out as did the power supply to the fuse. When I applied a test light to the positive lead at the connector by the fuel tank, it would light up for a half a second when the key is turned on. Repeatedly turning the key resulted in nothing. I switched the relay with the one for the heater and got the same results, lighting up breifly, then nothing. Chilton"s manual doesn"t help. Thanks for any suggestions...
Okay, 19 views and no response. Let"s try this, is there a electric pressure regulator on this car and if so where might it be located?
check that the pump and tank has correct ground, IMO pull it back out of the tank, hook it up directly to the plug and test power at the pump connectors itself, and verify that the new pump is even good in the first place. AND that its correctly installed and connected.its a simple basic electric pump setup,Vacuum spring mechanical regulator on the fuel rail, 1-2 second initial key on prime, and stays running once the engine cranks over.
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On a 95 Rodeo 3.2L the fuel pump relay is controlled by the ECM. When the ignition switch is placed in the Run position the ECM will momentarily energize the fuel pump relay to start the pump to prime the injectors for startup. Once the engine is rotating the ECM will continue to keep the fuel pump relay energized as long as it is receiving a "engine rotating" signal. Isuzu uses several different methods of obtaining an "engine rotating" signal. I believe on a 95 Rodeo it uses a signal generated by the electronic ignition module. It is a safety issue, if the engine is stops rotating after initial startup or never starts the fuel pump is shut Off. It appears from your test the ECM does momentarily start the pump to prime the injectors, but since the engine does not start there is nothing to create the necessary signal to keep the pump running. You may have a defective electronic ignition module.