Vehicle stalling

Brian Technician Las Vegas, Nevada Posted   Latest  
Question
Driveability
2003 Lincoln LS 3.0L (S) 5-spd (5R55S)—1LNHM86S53Y662463
Stall

Hello fellow techs I need some help with this Lincoln. I have recently replaced the fuel pump module due to having fuel pressure drop while driving the car about 20 to 30min. Fuel filter was clogged and also was replaced. I purchased a Delphi pump and thought everything was fixed but yet again having the same issues. I keep getting p0190 & p0191 and have tested the fuel rail pressure sensor monitoring the 5vref and ground with the return as well. The pids on the scanner with fuel rail voltage is the same as I see with my meter connected on the signal wire. I also have my fuel gauge connected to this while driving. Ive noticed on the fuel pump% pid when this happens is 50% steady and does not move but when is acting normal the percentage changes with acceleration and deceleration. Eventually the car will slowly start dropping pressure and runs like crap running at 12 psi. When I shut the vehicle off and turn it right back on the fuel pressure on the gauge goes back to normal till I start driving the car then slowly starts dropping again. Before replacing the old pump I had those codes p0190 and 191 but I figured they were there due to fuel pressure being low but still having the same codes come back up even after I clearn and reset keep alive memory. I also have codes for jet pump cirvuit being open. There is definitely fuel in the main pump since I opened it up and it was full in gas on that side of the tank. Im not sure if this new pump is no good or im missing something else. I really think I got a defective pump but I wanted to hear from other people before replacing it​.​thank you in advance.

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Randy Diagnostician
Glendora, California
Randy Default
 

Did you check for good power and grounds at pump loaded ??? . Current ramp pump

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Geoff Diagnostician
Lahaina, Hawaii
Geoff Default
 

I don't have SI at home but I think "jet pump" faults set, on saddle-bag style fuel tanks, when there is a calculated mismatch between how much fuel is on one side of the tank vs the other. The system "knows" which sender should change how much and and how fast. If there is a problem with the main pump not drawing/pulling/sucking from the other side of the tank you could be sucking air. After…

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Albin Diagnostician
Leavenworth, Washington
Albin Default
 

In reading your post, you have several pieces of information that jump out at me. The first thing is the fuel pump command at 50%. This is telling you the fuel pump is being commanded on 100% of the time. This is being done from lack of fuel pressure, which you have observed both with your gauge, and the effect on engine horse power. At this point, I would hook a scope to the power supply to…

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Chris Technical Support Specialist
Commack, New York
Chris Default
   

Have you monitored FPM? If there are issues electrically the FPM may show the issue. LS and Thunderbirds are unique in that they both use the REM (Rear Electronic Module) for FPDM functionality. SCP network comes into play in the fuel system as well. Fuel Pump Driver Module Note: For the Thunderbird and LS6/LS8, the FPDM functions are incorporated in the Rear Electronic Module (REM). Fuel pump…

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Jose Technician
Woodland, California
Jose Default
 

Have you replaced the fuel rail pressure sensor yet?

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Phillip Diagnostician
Anchorage, Alaska
Phillip Default
   

Everyone brings up good points. But keep somethings in mind. You need to know what a a good pressure is supposed to be. You need to know what a command to the fuel pump module is supposed to be. Last you need to know what a good duty cycle is supposed to be. With those things known figuring out the reset can be pretty easy. Without me looking up the codes you listed. Make sure you know what the…

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Phillip Diagnostician
Anchorage, Alaska
Phillip Default
 

Reading through your story and looking at the code I would scope the voltage and ground at the pump if possible. (This is assuming you have a scope.) I would also do a current wave form as I mentioned in my last post and as other have suggested. I would then If it was me have a fuel pressure gauge and scan tool recording. Monitor what happens when pressure gets very low. You may need a helping…

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Paul Mechanic
Harvey, Illinois
Paul Default
 

If this is a saddle type tank and you have a transfer sending unit on other side of tank, make sure that it's operating as designed, connected and the pickup is not restricted. Don't have SI info at home. Had and Audi A8 that someone replaced lift pump and high pressure pump to cure a hot stall. Code was set for low fuel rail pressure on supply side. The car ran excellent for twenty minutes…

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Brian Technician
Las Vegas, Nevada
Brian Update
 

For all those who responded thank you very much I appreciate the time you guys took to reply. This problem was resolved with another new fuel pump. I was second guessing my self when the new fuel pump I put in did not fix the problem. After current ramping the pump I did notice when the pump was acting up and replaced it with another one and did a long test drive and never had an issue after…

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Randy Diagnostician
Glendora, California
Randy Default
 

New parts never ever work lol

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