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Old 12-17-2010
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Join Date: Dec 2010
Location: Edmonton, Alberta
Posts: 4
Help diagnosing fuel pump issue

Hi guys,

I driving a 1996 Ranger 2.3L 4cyl. I am new to the forum and need some expertise diagnosing why my truck suddenly died the other day while driving.

I don't hear the fuel pump now so I thought I would check for voltages with a meter

there are 3 wires going into the inertia switch and there is continuity between the 2 thicker wires. When key is in the on position, there is no voltage to either thick wire but there is 12v to the thinner wire;I am not sure what this wire is for (it does not exist in my haynes wiring diagram).

I would like to check the relay under hood next but I don't have a diagram and nothing is labelled.

Does anybody have a diagram for the relays and fuses under the hood?
Can somebody explain the 3 wires in the inertia switch?


Last edited by karmtec; 12-17-2010 at 12:24 PM.
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Old 12-17-2010
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Originally Posted by karmtec View Post
Can somebody explain the 3 wires in the inertia switch?

The inertia switch normally has power in from the fuel pump relay on the Dark green/Yellow and power out to the pump on the Pink/Black. When the inertia switch is tripped, the power is disconnected from the pump and redirected through the Gray/Orange to a "Fuel Reset" indicator light in the instrument cluster.
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Old 12-18-2010
Join Date: Aug 2010
Location: Vancouver, BC
Posts: 42
You can always bypass the inertia switch with a heavy gauge wire, even rebar wire, as it holds it shape. Take the harness off the switch and insert the wire. Be careful, as there is a lot of current through this switch, so the wire will get hot if it has current through it for any amount of time. After doing this, listen for the pump to prime when you turn on the key, and try turning the engine over.
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