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#4115844 - 07/21/21 09:41 AM Re: Possible Fuel/Air mixture problem [Re: Site66]
DonnieK Offline
n00b

Registered: 01/15/20
Posts: 12
Loc: Nashville, TN
Originally Posted By Site66
May be the fuel pump only becasue at that age its such a high failure rate.
Replace the fuel filter by the passenger side tire first.

Been through a pump replacement on another CV myself it sucks. But I confirmed it by renting a fuel pressure meter and it has a shrader valve on the fuel rail to hook it too. It reveled low fuel pressure that changed over time.

At the time it was so common I could not find a pump anywhere locally. Dealers sold out auto stores sold out.



So, I had this issue again, and you are correct. Im having a low fuel pressure issue. I took it to a professional mechanic this time, and he mentioned something about a Fuel Pump Control Module or something like that. He said its maybe located in the trunk. He was still trying to track down the part and all the exact info, but sounds like I might be in for a new fuel pump. That would explain my lean misfires when the problem occured. I googled and seems like 06+ only have the fuel pump control module. My 05 system diagram only shows the pump.
_________________________
2005 CVPI, Street Appearance Package. Former Detective car from Small town TN.

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#4115880 - 07/21/21 01:04 PM Re: Possible Fuel/Air mixture problem [Re: DonnieK]
RF_Overlord Offline

Poobah

Registered: 12/14/02
Posts: 7614
Loc: MA
That control module is called the FPDM...Fuel Pump Driver Module. It's located in the front left corner of the trunk. FPDMs have existed since 2003, when Ford switched to a returnless fuel system.

Its purpose is to vary the duty cycle of the pump to maintain the desired fuel pressure.
_________________________
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen

'04 Grand Marquis LS Limited Edition (Spruce Green)
Daily Driver (Thanks, Adam!)

'00 Grand Marquis GS (Silver)
Rotted frame and broken transmission crossmember
Being resurrected...slowly.

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#4115882 - 07/21/21 01:29 PM Re: Possible Fuel/Air mixture problem [Re: RF_Overlord]
DonnieK Offline
n00b

Registered: 01/15/20
Posts: 12
Loc: Nashville, TN
Awesome. So my guy says that he has to go through Ford to get one. Every had any problems with that, and what I might be possibly looking at to get it replaced?
_________________________
2005 CVPI, Street Appearance Package. Former Detective car from Small town TN.

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#4115886 - 07/21/21 02:43 PM Re: Possible Fuel/Air mixture problem [Re: DonnieK]
RF_Overlord Offline

Poobah

Registered: 12/14/02
Posts: 7614
Loc: MA
Replacing it is simple. I've never had to actually do it as they rarely fail, but it's plug-and-play with no programming needed.

You don't have to go through Ford to get a replacement. Dorman and other aftermarket companies have them.
_________________________
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen

'04 Grand Marquis LS Limited Edition (Spruce Green)
Daily Driver (Thanks, Adam!)

'00 Grand Marquis GS (Silver)
Rotted frame and broken transmission crossmember
Being resurrected...slowly.

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#4116718 - Yesterday at 11:08 AM Re: Possible Fuel/Air mixture problem [Re: RF_Overlord]
DonnieK Offline
n00b

Registered: 01/15/20
Posts: 12
Loc: Nashville, TN
So, turns out we replaced the Hi Pressure Sensor on the fuel rail and that cleared all codes and the car is running great now. The codes were all in the computer but tripping the Check Engine, which is why I never even considered replacing this sensor. I put a 21 dollar Amazon special on there and I should have known better. No more knock off electronics. Car is running like a champ now. But I may try to locate one of those modules now, before I get in a pinch. He said there is a specific Police Interceptor one that is not cataloged. So he was having a problem locating it. I'll check those you mentioned. I definitely appreciate everyone's advice.
_________________________
2005 CVPI, Street Appearance Package. Former Detective car from Small town TN.

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#4116744 - Yesterday at 03:22 PM Re: Possible Fuel/Air mixture problem [Re: DonnieK]
RF_Overlord Offline

Poobah

Registered: 12/14/02
Posts: 7614
Loc: MA
Specific Police Interceptor FPDM? I've not heard of such.
_________________________
'03 Mercury Marauder (The Blackbird)
Trilogy Motorsports supercharged #61
Too many mods to list / Driveway Queen

'04 Grand Marquis LS Limited Edition (Spruce Green)
Daily Driver (Thanks, Adam!)

'00 Grand Marquis GS (Silver)
Rotted frame and broken transmission crossmember
Being resurrected...slowly.

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#4116748 - Yesterday at 04:15 PM Re: Possible Fuel/Air mixture problem [Re: DonnieK]
SocalSam Offline
Over the Hill

Registered: 03/30/13
Posts: 2767
Loc: SFV, Calif.
I didn't catch the DTC that you found. It is a great idea to have a $10 code reader in the glove box to take some of the guess work and parts shotgunning out.
_________________________
2004 CV LX Sport #1, 57,000 miles -- Never was
2004 CV LX Sport #2, 121,000 miles -- Current
2008 CVPI Arizona Beige, 121,000 miles, 677 idle hours -- Current
2005 CVPI Ex-San Diego P.D. -- 2 month loaner


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