@

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.

See the latest solved car problems :-----
For more Fuel/gasoline related help, follow the list mentioned below: -----

How to relieve fuel pressure?

http://technoanswers.blogspot.com/2012/01/how-to-relieve-fuel-pressure.html

Refueling problem?

http://repairhelpcenter.blogspot.com/2012/01/refueling-problem.html

Toyota Tercel consuming more fuel?

http://repairhelpcenter.blogspot.com/2012/01/toyota-tercel-consuming-more-fuel.html

How to maximize fuel economy on your vehicle?

http://schematicsdiagram.blogspot.com/2011/11/how-to-maximize-fuel-economy-on-your.html

Fuel pump relay and cooling fan relay troubleshooting on 1997 ford thunderbird?


How to Increase gas mileage on 2011 2500HD Duramax 6.6?

How to Test and Replace Fuel Injectors on Acura Car Models?


How to replace Fuel Tank Assembly?


FUEL LINES AND FITTINGS on Acura Car Models?


Replacing Fuel Charging Assembly on Car?

                          

How to replace Fuel Pressure Regulator on Acura Car models?


How to test Fuel Pressure and replace Fuel Pump on Acura Car models?


Car will not take fuel into the fuel tank?

http://repairhelpcenter.blogspot.com/2012/01/car-will-not-take-fuel-into-fuel-tank.html

PGM-FI Main Relay on Acura Car models?


How to Relieve Fuel System Pressure on Acura Car Models?


How to Replace a Fuel Injector

How to Replace a Fuel Pressure Regulator?

How to Replace a Fuel Pump?

HOW TO CLEAN A FUEL SYSTEM


HOW TO REPLACE A FUEL TANK

 

HOW TO REPLACE A FUEL TANK CAP


HOW TO REPLACE A FUEL PUMP ASSEMBLY

Time to replace Fuel pump on 1998 Ford Explorer?

Emergency fuel shut switch on Ford car?

How to jump fuel pump On Chevrolet Silverado 1500?

Car won’t start when cold?

Car won't start after sitting overnight?

Car loses power while acceleration?

Fuel leaks from fuel pulsation dampener on Toyota Corolla?

Car will not allow to put fuel?

Adding performance chip to increase Fuel mileage MPG?

How to test Electric fuel pump on GMC sonoma?

Fuel gauge drops to Empty?

Fuel pump not working on 1991 Ford Ranger?

http://technoanswers.blogspot.in/2012/01/fuel-pump-not-working-on-1991-ford.html


@