Monday, February 27, 2012

Fuel pump not running?

This problem is noticed on Ford expedition.
Its a 2000 year model ford.

In this case the fuel pump has no power and its not running.

On that basis the troubleshooting is as follows :-----

First check the fuel pump relay,then inertia switch and the fuel pump wiring.

The location diagram of fuel pump relay is as follows :-----
graphic



Try to jump fuel pump directly.

To do this try this :---

Test the pink wire at the plug where it connects pump.Now run 12 volt power in to pump side of that wire and see if the pump starts and runs.
If the pump runs then wiring is the issue and pump is ok.But if its not running then pump is issue.

Also try one more procedure for confirming the problem :----

Do a quick test, make sure the truck is back to normal, all connector and stuff plugged in. On the fuel rail on the engine you shoud see a small valve that looks like the valve on a tire. It may have a cap on it. Now  try starting the truck 4 times. When its done take a screw driver and push in on the valve. Keep your face away. If your pump is working then you should get a burst of fuel. If nothing comes out then something is wrong there and we can hunt it down.

If it works then inertia switch and relay needs to be checked to confirm the issue.
Try this test as follows :----

First thing we need to do is divide the circuit and see where we are losing power. The inertia switch is right in the middle of this circuit. So first thing i want you to do is disconnect the inertia switch and test for power on the green wire/with yellow tracer. Now when you turn the key on the pump relay is commanded on for only three seconds, so set your test up first, then turn truck on. You should see power for 3 seconds. It should be on continuously when you crank the engine.

This tests and troubleshooting possibilities will help you to confirm the problem.

so as per that you can go for replacing and repairing the particular parts.

This will help.
Thanks.

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