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1979-2004 V6 Mustangs General Discussions

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Unread 03-05-2011   #1 (permalink)
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Default 1998 mustang no power to fuel pump.

i just got a 1998 v6 mustang from my sister. they had it running two months before i picked it up. Now it has no power to the inertia switch or fuel pump. I replaced the constant control relay module and its the same thing. i know the odd of buying a bad constant control relay module is slim. So what else could it be? I know when you first turn the key to the run position the pump should run around 5 seconds to build up pressure but after that will the power turn off until its needed? I can't turn the key on and check the wires in this short time frame by my self. I have ran a hot wire from the battery to the brown wire with the pink strip and i still don't here the fuel pump turning on. Is it just a fuel pump gone bad and my lack of trouble shooting by mself hindering things? Should the fuel pump be hot (12volts) all the time the key is turned on?
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Unread 03-05-2011   #2 (permalink)
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The inertia switch has a red botton and it should be pushed down to make sure the power goes to the pump. If you have power going into the switch but not out would mean it has tripped and needs to be reset by pressing the button down. The 1998 models did not have returnless systems so yes the pump should be pumping all the time and the fuel will circulate through the system. That being said it means yes the pumpm should be Hot as in on at all times the key is turned on.
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Unread 03-05-2011   #3 (permalink)
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Also, check your fuel pump fuse in the pdi box........
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Unread 03-05-2011   #4 (permalink)
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No power to inertia switch either. Red top is pushed down. According to the wire diagram i have for a ccrm i have the power from the fuse to the ccrm for the fuel pump relay. this should be pin #11 and it has 12 volts when key is turned on. I guess i'm going to see the ground is still thier pin 18.
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Unread 03-05-2011   #5 (permalink)
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Unread 03-05-2011   #6 (permalink)
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My pin #5 lights up when key is on. pin #11 lights up all the time. pin #18 lights up when key is on. Pin 15 lights up when i switch to positive side of battery. What am i missing with this diagram?
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Unread 03-06-2011   #7 (permalink)
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What are signs of the pats system failure? Will the car still crank?
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