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Fuel problem?

Discussion in 'CJ' started by MattLaug24, Oct 16, 2017.

  1. Oct 16, 2017 at 7:04 PM
    #1
    MattLaug24

    #1
    MattLaug24 [OP] Member

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    I replaced my fuel pump and several hoses on my Cj, but for some reason it takes quite a few cranks for the engine to start, and then it idles really low and dies if I don’t hold on the throttle a bit. Then eventually it catches and idles normally. What might it be?
     
    Last edited: Oct 16, 2017
    MattLaug24, Oct 16, 2017
    #1
  2. Oct 16, 2017 at 7:15 PM
    #2
    JKBob 25

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    JKBob 25 Well-Known Member

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    Humm. New pump and lines. Filter comes to mind. But doubt that's the issue. OFFGRID is probably our most knowledgeable CJ member. Peter......you out there???? Hang tight Matt.
     
    JKBob 25, Oct 16, 2017
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  3. Oct 17, 2017 at 6:57 AM
    #3
    OFFGRID

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    OFFGRID Well-Known Member

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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.
    Are you running the factory carb? Did the jeep sit up for a long period of time without being run?
     
    OFFGRID, Oct 17, 2017
    #3
    JKBob 25 likes this.
  4. Oct 17, 2017 at 7:21 AM
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    Prerunner1982

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    Prerunner1982 Well-Known Member

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    Carb cleaned? Choke needs adjustment?
     
    Prerunner1982, Oct 17, 2017
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    JKBob 25 likes this.
  5. Oct 17, 2017 at 3:29 PM
    #5
    MattLaug24

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    MattLaug24 [OP] Member

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    Motorcraft 2150 swap, has like 500 miles on it, and the carb sat off the engine for a few months as I rebuilt the block. I haven’t checked anything with the carb yet. I’ll start there
     
    MattLaug24, Oct 17, 2017
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  6. Jan 28, 2018 at 8:33 AM
    #6
    Cj5_fan

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    Cj5_fan Member

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    Remove the top housing on the carburetor observe the position of the float and the level of fuel in the carburetor prior to attempting to start it. It could be something as simple as your fuel is boiling out of the carb and the crank is necessary to reprime the Bowl. It could also be something to do with your power valve to where the fuel is leaking out of the bowl and again you need to replenish the bowl level prior to starting. As for it idling really slow when it starts and then later leveling out that is normally one of two things. First it could be an improperly adjusted choke. Second you could have a vacuum leak that is stabilizing out as things warm and expand. You can check for that by taking a can of brake clean or similar product and spraying around the base of the carburetor and any other obvious position where vacuum maybe leaking and see if You observe a change in the motors Behavior or idle speeds.
     
    Cj5_fan, Jan 28, 2018
    #6
    JKBob 25 and aggrex like this.
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