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#4120908 - 09/15/21 01:31 AM P0191 F'd me
bigdaddyd Offline

Member

Registered: 08/16/03
Posts: 469
Loc: Austin, Tx
my '08 just died rounding a turn. got it home and had only 1 code. p0191. did a quick search and found fuel pressure sensor or fuel pump driver module. bought the sensor and nothing!
did some more homework and found fuse #4 blown. switched out fuse and relay. tried to start and did not hear the pump prime and car did not start. #4 is blown again! noticed that AZ brings up a pigtail when looking up the FPDM.
is there a known issue with the FPDM shorting out and blowing #4? already $130 in and don't want to do fuel pump if i don't need to!
HELP!!!
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07 P71,09 P71,05 P71, 99 P71, 06 P71 totaled! sold my first 4 P71's
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#4120988 - 09/15/21 05:46 PM Re: P0191 F'd me [Re: bigdaddyd]
bigdaddyd Offline

Member

Registered: 08/16/03
Posts: 469
Loc: Austin, Tx
I'm really in a pinch! I need to figure out what is blowing #4 asap!!!
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07 P71,09 P71,05 P71, 99 P71, 06 P71 totaled! sold my first 4 P71's
http://www.supermotors.net/vehicles/registry/media/570548_1

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#4121028 - 09/15/21 10:04 PM Re: P0191 F'd me [Re: bigdaddyd]
RF_Overlord Offline

Poobah

Registered: 12/14/02
Posts: 7676
Loc: MA
Trigger the fuel safety shutoff switch and see if the fuse still blows. If not, then unplug the FPDM and try again. That will either point to (or eliminate) the circuit from the fuse and relay in the BJB all way to the FPDM. That just leaves the FPDM itself or the wiring from there to the fuel pump and the pump itself.
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#4121090 - 09/16/21 04:45 PM Re: P0191 F'd me [Re: bigdaddyd]
bigdaddyd Offline

Member

Registered: 08/16/03
Posts: 469
Loc: Austin, Tx
i replaced the fuse and tried to start her again. car ran for 2 seconds then stalled. checked fuse and was ok. tried again, nothing. fuse blew on the 2nd try. checked shutoff in trunk and pushed down just to be sure, felt no movement so assumed not it. do not hear pump prime any of these times!??? will try unplugging fpdm next and go from there.
is the relay being damaged by the fuse blowing???

thanks RF O for suggestions!!!
_________________________
07 P71,09 P71,05 P71, 99 P71, 06 P71 totaled! sold my first 4 P71's
http://www.supermotors.net/vehicles/registry/media/570548_1

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#4121102 - 09/16/21 06:43 PM Re: P0191 F'd me [Re: bigdaddyd]
bigdaddyd Offline

Member

Registered: 08/16/03
Posts: 469
Loc: Austin, Tx
put in a new FPDM and car started. ran like [censored] for a minute then died. blew #4 again! did i just kill the new FPDM? if i put a new fuel pump in do i need to replace the FPDM too? Why is #4 blowing??
_________________________
07 P71,09 P71,05 P71, 99 P71, 06 P71 totaled! sold my first 4 P71's
http://www.supermotors.net/vehicles/registry/media/570548_1

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#4121106 - 09/16/21 07:05 PM Re: P0191 F'd me [Re: bigdaddyd]
ironmarinebill64 Offline
Rookie

Registered: 01/30/21
Posts: 54
Loc: New York, USA
What you describe sounds (reads) to me like there's a short in the wiring.

I'm not a master electrician but he repeated blown fuses would be indicative of a 12 volt positive wire grounding to the frame or body. I'd recheck all the wires across the top of the tank and coming from the FPDM to the tank to see if the insulation is rubbed off and shorting somewhere.
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#4121416 - 09/18/21 04:42 PM Re: P0191 F'd me [Re: bigdaddyd]
bigdaddyd Offline

Member

Registered: 08/16/03
Posts: 469
Loc: Austin, Tx
this site ain't what she used to be!!! oh well...
_________________________
07 P71,09 P71,05 P71, 99 P71, 06 P71 totaled! sold my first 4 P71's
http://www.supermotors.net/vehicles/registry/media/570548_1

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#4121418 - 09/18/21 04:59 PM no prime noise?
bigdaddyd Offline

Member

Registered: 08/16/03
Posts: 469
Loc: Austin, Tx
where do you check for power to fuel pump? when the key is turned to run i'm not hearing the prime noise??? also keeps blowing #4 fuse!
_________________________
07 P71,09 P71,05 P71, 99 P71, 06 P71 totaled! sold my first 4 P71's
http://www.supermotors.net/vehicles/registry/media/570548_1

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#4121424 - 09/18/21 06:27 PM Re: P0191 F'd me [Re: bigdaddyd]
SocalSam Online   content
Over the Hill

Registered: 03/30/13
Posts: 2842
Loc: SFV, Calif.
Originally Posted By bigdaddyd
this site ain't what she used to be!!! oh well...


Man, I don't feel like helping but I will anyways. Sometimes mechanic will short cut fuel pump replacement by splicing wires to save time and headache. The correct way is to drop tank to dig out the connector which is buried up in the body somewhere. If spliced, check and correct.
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#4121476 - 09/18/21 11:22 PM Re: no prime noise? [Re: bigdaddyd]
TheShadow Offline

Over the Hill

Registered: 05/01/07
Posts: 1784
Loc: SoCal High Desert
The harness runs through a hole in the forward end of the trunk shelf, in the middle. If the connector is not there, you should be able to pull it into the trunk. If not, then it's tiewrapped underneath, and would be accessible in front of the tank, up top by the body brace.

You could also check at the cutoff switch, whichever is easier for you to get at.

A trouble light will help troubleshooting, or an assistant to turn the ignition key...remember the pump only primes for a second or two, so the voltage will disappear fast...
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