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Old 07-31-2009, 11:42 PM   #1 (permalink)
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My mom's 2003 Taurus vin code U has only code P0191 and has been stranding her. It only has 40,000 on the clock.

Symptom is after the car has been running for 30 minutes plus, it will die and not start again. After it cools off it will start again.

I ran it with my Actron 9185 and the fuel pressure was around 40 psi. Then when I tried to start again it again after it died I had a Key on Engine off psi of 17.

I think it is the fuel pressure regulator, when I unplugged the electric connection from it with the engine running, the fuel pressure jumped to 90psi, but that caused it to throw code P0193

I understand that the normal fuel pressure should be 80 - 120 psi?

I really hope it is this sensor, but I can't find where to procure one. any help with that, and is this the fuel pressure regulator.

Is this a good picture of the sensor regulator? What is the part number and where can I get it? Think it will fix my problem. I really do not want to drop the gas tank.

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Old 08-01-2009, 12:18 AM   #2 (permalink)
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Normal pressure is ~40psi. After the car dies, hook the pressure gauge and try starting it. If the pressure is abnormally low during cranking, your pump is shot.

PS, you need a REAL pressure gauge. While the computer scan tool is a good way to measure it, if the sensor is on the fritz then the scan tool is useless.
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Old 08-01-2009, 10:34 AM   #3 (permalink)
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I feel that it is something other than the fuel pump. Why would it fail only after a certain amount of time? if the filter sock was clogged, or if the motor was used up, then I would expect the pump to fail immediately.

Couldn't it be this sensor? When I did my initial search on this code and problem, I found some feel that it is this pressure regulator, and some feel that it was the pump. Unfortunately, I never found someone that posted the results of what they had done.

Is there an easy way to give the fuel pump power from another source, so I could maybe see if the car will start after this sensor fails by giving the pump ful power?
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Old 08-01-2009, 09:41 PM   #4 (permalink)
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I replaced the Fuel pump assembly and everything is good to go. Fuel pressure holds steady at 40psi now. I got the fuel pump assembly at CarQuest.

The bolts for the tank straps are something you should buy before you start, they strip on the way out for some reason. 10mm x 60mm

What would Ford have charged me for labor on this?
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Old 08-06-2009, 07:47 PM   #5 (permalink)
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QUOTE (davesbedroom @ Aug 1 2009, 09:41 PM)
Quote:
I replaced the Fuel pump assembly and everything is good to go. Fuel pressure holds steady at 40psi now. I got the fuel pump assembly at CarQuest.

The bolts for the tank straps are something you should buy before you start, they strip on the way out for some reason. 10mm x 60mm

What would Ford have charged me for labor on this?[/b]

Yo' Dave's Bedroom----------We see CarQuest's website shows a replacement/repair installation for simply the motor-pump module. It replaces only, the motor/pump itself, not the whole nine yards which most all parts suppliers want 200-300 bucks. The barebones motor/pump available from CarQuest goes for like less than a hundred.

Which direction did you take?

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Old 08-11-2009, 10:26 AM   #6 (permalink)
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I needed the whole nine yards. I would not get just the pump.
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Old 03-09-2012, 02:55 PM   #7 (permalink)
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I am only seeing p0193 with no adverse events other than the CEL on; I have cleared it 3 times now over the course of 6k miles and it will stay off for a while - 4k miles the first time, 1600 the 2nd.....any recommendations? Im not convinced in the reading that I have done that a fuel pump will fix it.
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Old 03-09-2012, 04:13 PM   #8 (permalink)
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191 / 193 can be caused by a faulty rail sensor assuming you dont have any FPDM codes present.
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Old 03-09-2012, 07:01 PM   #9 (permalink)
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The only other code I saw was p1270 and that was just today, not the previous 2 times. FPDM = fuel pump ___________?
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Old 03-09-2012, 09:31 PM   #10 (permalink)
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FPDM = fuel pump driver module.
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