☑ How To Test Fuel Pump Resistor

This video explains how to test fuel tank sending units using the ohm setting on a digital multimeter. Resistor added solves cavitation issues.

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How to test fuel pump resistor. Bridge the vehicle side harness connector with a solid piece of wire. Some guys after doing pumps etc. It allows the pumps to function on the dual voltage setup so at low rpmlow throttle only one pump is running then at wot both pumps kick in.

The fuel pump relay should have power on 2 terminals. Free fix how to diagnose and adjust an ac compressor clutch in car truck blows cold then warm duration. Here is an easy method to bypass the fuel pump resistor which puts the fuel pump in the high speed mode which is done at relay 18 fuel pump speed control relay located at the engine compartment fuse box.

During the video is mentioned that the readings will vary in between different makes and. This will make the pump run full speed at all times regardless of the commanded speed the bypass relay either on or off. The fuel pump relay is powered through the efi 1 fuse the efi relay and the copn relay.

A tabcontact on relay 18 is bent out which puts the fuel pump in high speed mode. End up having some fuel pressure problems and pull the resistor and jumper the plug to just run the full voltage both pumps on at full all the time. Check this fuse first then try swapping out each of these other two relays to see if you get power to the fuel pump relay.

The first thing to do is unplug the resistor located on the driver side inner fender just in front of the fuse box.