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Three wires - the dark green with yellow stripe comes from the fuel pump relay ! When energized the relay sends battery voltage to the inertia switch via the dark green with yellow stripe wire . Inertia switch's don't go bad ! What's the problem ? fuel pump not working ? Test from the relay > Do you know what a relay is and how it works ? Watch this guy's video ! He shows chrysler first then ford . Do you know how to do electrical testing ! It doesn't matter that your inertia swich has three wires . Only two matter ! Fuel Pump Electrical Circuits Description and Operation
Your vehicle has an inertia switch, which is located on the tow board to
the right of the transmission pump. Usually the fuel pump does not shut
off except in the case of an accident but you can check it anyway.
Being fuel injected, your fuel pump is probably in the gas tank and if
there is no power to the wires coming out of the tank, you probably have
a bad fuel pump
Fuel Pump relay switch is in the main box usually located on the drivers side Fender in a black box.
According to the owner's manual in the power distribution box in the engine
compartment (Ford recommends disconnecting your battery)
Relay # 5 is the fuel pump relay , and also in the PD BOX is a 20 amp mini-fuse
for the fuel pump relay + RAP module in location # 9
( P.S. - don't forget your fuel pump inertia switch , in the right front passenger area ,
by the right front kick panel )Sometimes this gets kicked by passenger or if the car is bummed hard it could set this item to shut down fuel system. Best of Luck
check for fuel, fuel pump could be getting hot then shutting off,
could be fuel pump relay, could be coil, computer,etc just a couple places for you to start
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