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Fuel pump sending unit 2001 Jeep Wrangler 4.0 ltr

Discussion in 'Wrangler TJ (1996-2006)' started by 2001jeep, Feb 21, 2017.

  1. Feb 21, 2017 at 7:20 AM
    #1
    2001jeep

    2001jeep [OP] New Member

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    T-DOG
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    Money pit
    Ok I've replaced this same part probly 5times in the last 4 years. Originally I changed it because the one way check valve quit working. Wife complaining of not starting right away (2-3 cranks then starts) Then ever since it has been one continuing pain in my ass ever since. I have bought parts from auto zone, pep boys, checker, all failed in about 8-12 months. the latest has been from napa (although it lasted the longest of them all!) last time I replaced the sending unit while changing it one of the vapor lines on top of the tank cracked opened. It was still attached didn't think anything of it. Replaced sending unit then reinstalled tank 2 months later check engin light come on (you guessed it) emissions fault I forget the exact fault but basically I put it off until I had to smog check the thing well I dropped the tank fixed the lines then wouldnt you know it the one way check valve quit working imidiately after!!! So for the past year we have just been putting up with it. 2-3 cranks to start.... well now it takes 5-6 cranks to start. Finally breaking down to replace it but looking for recommendations for part replacement also why do these check valves fail so readily?
    I've just about had it with this B.S. Any help or suggestions are appreciated.
     
  2. Feb 21, 2017 at 11:52 AM
    #2
    OFFGRID

    OFFGRID Well-Known Member

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    Houston
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    1979 Jeep CJ7, 258, TH350, NP208
    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    Fuel injection systems should stay pressurized after the motor is shut down. Are you sure that you are not losing pressure anywhere else? I have always used Oreilly's when I can. They will also match prices with anybody else usually regardless of the brand. They carry Precision brand fuel pumps.
     
  3. Feb 22, 2017 at 2:53 AM
    #3
    Jasons4.6

    Jasons4.6 Active Member

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    Black 97 cherokee sport
    4.6 stroker, m90 supercharger, true dual exhaust with sidepipes, old school 6 pack mopar hood scoop, and 3.55 gears front and rear
    I agree with offgrid. You could very well have leaky open injectors also
     
  4. Feb 22, 2017 at 2:20 PM
    #4
    2001jeep

    2001jeep [OP] New Member

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    Wouldn't you smell gas though if that was true? What about the gas tank the vapor ports on the top? The male end connectors broke off so I had to glue those back on. Also if injectors were bad how can I test it?
     
  5. Feb 22, 2017 at 9:34 PM
    #5
    OFFGRID

    OFFGRID Well-Known Member

    Joined:
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    Member:
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    Gender:
    Male
    First Name:
    Peter
    Houston
    Vehicle:
    1979 Jeep CJ7, 258, TH350, NP208
    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    You wouldn't smell gas because its dumping into an enclosed space. Not sure how to test. That would be a good question for Richard I think.
     
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