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2004 Mustang GT 4.6 P1237 Fuel pump error

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2004 Mustang GT 4.6 P1237 Fuel pump error

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Old 07-14-2011, 08:41 AM
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rustydog001
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Default 2004 Mustang GT 4.6 P1237 Fuel pump error

This 2004 4.6 X engine just started surfacing a P1237 error (fuel pump secondary circuit fault). This car has been mostly sitting, it has 9200 miles on it.
I took it out of storage it had a bad hesitation problem during acceleration, any load above 2k rpm, (it did have some drivability issues prior to storage but never threw an error). After I replaced the fuel filter it ran great for about 10 miles. I opened the filter and it looked clean, the pores my have been plugged but it looked clean. I just surfaced the p1237 this am but can't find any troubleshooting information. Does anybody have shop manual detail or personal experience on a P1237.
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Old 07-14-2011, 08:44 AM
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rustydog001
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Just joined and love this forum already. After my initial post I started searching and found some great info from ckiffyk (Great tech info) and koolersl2. I have a lot to check out, thanks guys.
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Old 07-14-2011, 08:58 AM
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rustydog001
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Where is the FPDM, fuel pump driver module located?
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Old 07-14-2011, 02:57 PM
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rustydog001
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Followed the wires back to the trunk side of the left rear fender. Partially dropped the tank found nothing wrong, ordered the FPDM.
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Old 07-26-2011, 09:42 PM
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The fuel pump driver module fixed my hesitation problem. Prior to replacing the module , with a scanner I could see the fuel rail pressure dropped from 40 lbs to 5, the pump voltage dropped instead of increesing.
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