Tuesday, January 31, 2012

Fuel pump has no power on 2002 ford 350 7.3 diesel?

This was noticed on many other ford models too.
The fuel pump will not get power,but if direct wire run from battery to fuel pump,then fuel pump with start and run.
This clearly indicates,that fuel pump is not faulty,but something is causing  no power issue on fuel pump.

Check for power at Inertia switch.
Try this check for power at the inertia switch after the key is turned on. If you have power at inertia switch,then run a positive wire from battery to the pink wire on the fuel pump and see if the pump runs fine and the truck starts or not.

If this is the case,in your problem,then read as follows :----

The power to the inertia switch come from the fuel pump relay on the Dark/green power wire at the Inertia switch and goes through the switch and out on the Pink/black wire directely to the pump. You need power in and out of the inertia switch while cranking. 

If you have power in and out and none at the Pump then you have a broken wire from the switch to the pump.

See the enclosed diagram shown below for better understanding :--------

graphic

Now if you have cranking voltage both in and out of the inertia switch .Then the problem is wire between inertia switch and fuel pump.That wire has to be replaced.
If so then simply overlay a new wire and you should be fine, its much easier than stripping the harness back to find the break. Just be sure to solider the connections on the new wire.

This details will help.
Thanks.

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