No fuel pressure, 2000 3.8

Discussion in 'SN95 V6 Mustang Tech' started by Tricky.1, Dec 7, 2009.


  1. Tricky.1

    Tricky.1 New Member

    Joined:
    Dec 7, 2009
    Messages:
    7
    Likes Received:
    0
    Trophy Points:
    0
    Hi all.
    New here & am having a fuel problem with my 2000 3.8 Mustang.
    No fuel pressure.

    I checked & there is no pressure at the fuel rail. I have listened at the fuel filler neck wile wify turned the key. Silence.
    I checked the IFS switch in the trunk, and the button was in.
    I checked the fuel pump relay & CCRM fuses & they are both good.
    Also the battery is new & I'm getting fire.

    I plan to change the fuel filter & test if there is any voltage to the fuel pump, but I'm not sure of what wires to look for. I guess I'll find out when I get under the gas tank. Anyone know?

    I'd rather not assume it's the fuel pump & drop the tank, until I've checked everything else.

    Anyone know what would be the next things to check & how?
    CCRM, PCM, CMP ???
    I havent been able to find the CCRM yet.

    I used to work as a Ford/Isuzu heavy truck & tractor mechanic but there was very little computer control.

    Any info on this would be greatly appreciated.

    Thanks.
    #1
  2. stangfanatic

    stangfanatic New Member

    Joined:
    Oct 5, 2009
    Messages:
    114
    Likes Received:
    0
    Trophy Points:
    0
    Do you have voltage coming out of the inertia switch?
    #2
  3. lil'MONSTER

    lil'MONSTER New Member

    Joined:
    Dec 4, 2009
    Messages:
    3
    Likes Received:
    0
    Trophy Points:
    0
    Hi mate, before you go any further check to see if the pump is working.....????? and that you have power at the pump! Good luck!!!! :)
    #3
  4. Tricky.1

    Tricky.1 New Member

    Joined:
    Dec 7, 2009
    Messages:
    7
    Likes Received:
    0
    Trophy Points:
    0
    The pump is not working. Will test the IFS, and find out if I'm getting power to the pump next.
    Anybody know which wires go to the pump & which are for the sending unit?

    Thanks.
    #4
  5. stangfanatic

    stangfanatic New Member

    Joined:
    Oct 5, 2009
    Messages:
    114
    Likes Received:
    0
    Trophy Points:
    0
    It appears as if the wire coming into the inertia switch will be Dark Green/Yellow ( this has two branches and comes from both the CCRM and PCM to the inertia switch) and coming out of the inertia switch to the fuel pump is Brown/Pink.
    #5
  6. Tricky.1

    Tricky.1 New Member

    Joined:
    Dec 7, 2009
    Messages:
    7
    Likes Received:
    0
    Trophy Points:
    0
    First off, Thanks so much for all the info!

    I'm getting power to the IFS.
    Checked the IFS with ohm meter & it checks out good.
    I bypassed the IFS with a jumper & the pump still doesnt run.
    I guess the next thing will be to check wiring at the pump.
    I'll have to push the car uphill into the driveway before I can drop the tank.
    I'll have to eat a big bowl of Wheaties. LOL

    Plan to do tomorrow & update what I find out.
    #6
  7. Tricky.1

    Tricky.1 New Member

    Joined:
    Dec 7, 2009
    Messages:
    7
    Likes Received:
    0
    Trophy Points:
    0
    Back working on fuel pump problem.

    I am getting power to the pump but pump not working. I'm ready to buy a pump. Any suggestions on an online source & brand?

    Sorry so long getting back on this, had to go out of town, then holidays, back out of town, now back & have time to get to work on this.
    #7
  8. jellowbob

    jellowbob New Member

    Joined:
    Sep 29, 2008
    Messages:
    7
    Likes Received:
    0
    Trophy Points:
    0
    same problem

    i had the same problem with my 96 GT and it turned out i was out of gas. make sure that it has gas. the guage could be wrong and you could be out. it amazed me that i was out and i would have never guessed that but when i lowerd the tank then it was empty. try that first before you spend $100 on a fuel pump! :nice:
    #8
  9. Tricky.1

    Tricky.1 New Member

    Joined:
    Dec 7, 2009
    Messages:
    7
    Likes Received:
    0
    Trophy Points:
    0
    It has a little over a 1/4 tank of gas. It started yesterday so I shut it off, released the fuel pressure at the fuel rail, and put a new fuel filter on. When I pulled the old filter off, gas leaked out of the lines and filter. It started back up, ran for about 5 minutes & then died. No fuel pressure. Then a little later, fuel pressure again, ran for a few minutes & then died again. No fuel pressure. I'm getting power to the pump when it is not working. It was doing this before I went out of town.
    #9
  10. Tricky.1

    Tricky.1 New Member

    Joined:
    Dec 7, 2009
    Messages:
    7
    Likes Received:
    0
    Trophy Points:
    0
    Any suggestions on a reputable online source for a fuel pump?

    Thanks.
    #10
  11. wmburns

    wmburns SN Certified Technician

    Joined:
    Aug 14, 2009
    Messages:
    3,121
    Likes Received:
    57
    Trophy Points:
    69
    Did you check the anti-theft system (if equipped)? What is the theft light doing?

    For the 1999-2004 MY, when activated the PATS system will DISABLE the fuel pumps and spark. You get crank with no start.

    For the 1996-1998 MY, the PATS system will disable the starter.
    #11
  12. Tricky.1

    Tricky.1 New Member

    Joined:
    Dec 7, 2009
    Messages:
    7
    Likes Received:
    0
    Trophy Points:
    0
    Good suggestion.

    I'm getting fire & power to the pump. Sometimes it will start & run for a few minutes, and then die because it stops getting fuel. Sometimes it wont start at all, but I'm still getting fire & power to the pump. It does have over a 1/4 tank of gas.

    I've found fuel pumps on line for around $100 but I'm not sure who is a trustworthy source.
    Can anyone suggest a reputable online supplier?

    Thanks.
    #12
  13. HISSIN50

    HISSIN50 "How long does it take to get help in here? SN Certified Technician

    Joined:
    Nov 30, 1999
    Messages:
    31,148
    Likes Received:
    13
    Trophy Points:
    79
    I'm gonna bump this one if y'all don't mind. Similar issue.

    2004 V6 auto with 80K miles. I am a 5.0 guy and don't know snot about the newer stuff. ANY thoughts are appreciated. :)

    The car ran fine. Stopped at a store for five mins and upon trying leave, it would crank but not catch. It's got spark but I don't hear the FP prime. I'm not at ALL familiar with the returnless systems and don't have a New Edge manual (except what is encompassed in a Haynes going up to '03).

    The inertia switch is closed, FP fuse is intact and has 12 on both sides. MAF has been cleaned. It shows a pending DTC 1237 (FP secondary circuit issue).

    Do these pumps have a prime-out period when the key is turned on? Is there a way to make the pump come on constantly with the key on (like you can do with OBD-I Mustangs)?

    Does anyone know the fuel-pump wire colors of the power and ground at the tank connector? If I knew that, I could at least run jumper wires and do a quick bench test. I'm having issues doing diagnostics because I don't even know if the pump normally primes or how to keep it priming so I can test stuff. It makes NO noise when the key is cycled.

    I can't find a Schrader valve anywhere to test pressure. Am I just missing it?

    Any logic on how to go about testing the FPR, FPDM and the pump (or whatever else seems prudent) would be greatly welcome.

    Thanks.
    #13
  14. wmburns

    wmburns SN Certified Technician

    Joined:
    Aug 14, 2009
    Messages:
    3,121
    Likes Received:
    57
    Trophy Points:
    69
  15. yelnats69

    yelnats69 New Member

    Joined:
    Apr 14, 2005
    Messages:
    3
    Likes Received:
    0
    Trophy Points:
    0
    Hi,
    I see you are saying that the wire from the inertia switch to the fuel pump is Brown/Pink
    Does this mean that I should have 12v at the Brown/pink wire and earth,
    Can I apply 12v to that wire and make the pump run?
    Regards
    #15
  16. wmburns

    wmburns SN Certified Technician

    Joined:
    Aug 14, 2009
    Messages:
    3,121
    Likes Received:
    57
    Trophy Points:
    69
    Yes. The IFS must have power at all times the key is on. If not, STOP and find out why.
    NO. Because the fuel pump driver module (FPDM) needs a digital signal from the PCM.

    Did you read the thread mentioned previously? It has complete instructions on how to confirm a diagnosis of a bad fuel pump for the 1999-2004 MY.
    #16

Share This Page