Ford Repair Questions? Ask a Mechanic for Answers ASAP
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If you take your 12 volt test light and or a volt meter are you getting key on engine cranking power in and out of the inertia switch?
The inertia switch on your 2003 is located in the left rear quarter panel. See the link below. Check and see if you have key on engine cranking batter power in and out of it and let me know what you faind.https://dl.dropboxusercontent.com/u/104923897/Inertia%20switch%20Oct%209.pdf
There is an addition charge for a live phone call of 26.00 Im pretty sure we can get this resolved with out having to spend this money if you can check the voltage in and out of the inertia switch and let me know the results.
Okay, if you find you have no power there while cranking the engine then its is likely the fuel pump relay but the relay is incorporated in to the CJB (interior fuse panel) and can not be replaced with out replacing the panel. Lets see if you have power in and out of it first and we can work from there.
Did you try to rest the switch, if the switch is reset and you are still lacking power in and out of it the that means the switch has failed and needs to be replaced. Before you consider replacing it, press the button on the top of it and see if it clicks. If it dose then it should now supply power to the pump. If it dose not then its likely failed.
Okay try unplugging it and install a jumper wire in the connector so both wires have cranking power, if so the pump should run and that would indicate the switch is bad.
Did you have power in and out of the switch when you jumped it?Did you hear the pump cycle on while cranking the engine over?
Okay so you not getting power to the switch as you said you where in your previous response while cranking the engine?