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Thread: Fuel pump

  1. #1
    "Don" Cilino jeepmudbogger's Avatar
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    Default Fuel pump

    I know it has been forever since I have been on here, but I am to the stage now that I am finishing up everything on the motor so it can be dropped back in.

    My question, I am having trouble getting my fuel pump back on. It wont line up right. I just realized it this morning that it is cam operated. Could it be that the lobe is in the wrong position and I just need to rotate? It seems like the pump is pressed up against the block.

    I just hope that the timing chain cover that I got from a friend of HillBillE isn't the problem.


    Also, what would be the correct way of putting an electric pump on or should I not even worry about using one?

    EDIT: Sorry, the engine is a 304
    *DECEASED* 1976 CJ-7, AMC 304/T150, 33" x 12.50 Dayton Timberline AT's, Stock AMC 20 rear and Dana 30 front both with 2.73's.

    1994 YJ, 2.5L, 5 speed, 2" body lift, 31x10.50's, CJ front clip

  2. #2
    Senior Member HillBillE's Avatar
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    Could be the cam lobe is in the 'pump' position, or the lever of the fuel pump is on the wrong side of the lobe.

    There should be some pressure on the pump 'lever' as you install it, but you shouldn't have to force it to much.

    First, make sure the pump lever isn't 'frozen'- it will be stiff, but you should be able to put it against a block of wood, and make it move. It will spring back right away.

    Second, try turning the crank 1/16 or 1/8 of a turn, this will move the cam lobe a bit. For each 1/2 turn of the crank, the cam will make a full turn.


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  3. #3
    "Don" Cilino jeepmudbogger's Avatar
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    I will turn the crank, but is it bad that I can move the lever by hand?
    *DECEASED* 1976 CJ-7, AMC 304/T150, 33" x 12.50 Dayton Timberline AT's, Stock AMC 20 rear and Dana 30 front both with 2.73's.

    1994 YJ, 2.5L, 5 speed, 2" body lift, 31x10.50's, CJ front clip

  4. #4
    Senior Member HillBillE's Avatar
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    Quote Originally Posted by jeepmudbogger View Post
    I will turn the crank, but is it bad that I can move the lever by hand?
    The lever is really hard to move by hand while holding the pump. I hold the pump with both hands and place the lever against a 2x4 (usually clamped in a vice) and push against it. The lever will move and 'jump' right back as you release pressure.

    If it won't move using that method, somethings froze up in the fuel pump.

    But yeah, it's almost impossible to hold the pump in one hnd, and 'pump' the lever with the other hand.

    Is it a new pump, or the old one? I've seen old ones freeze up after sitting for a while.


    As long as the people remain armed,
    government knows that it cannot rule over the people by force.
    Those who stand in defiance of unconstitutional laws
    do so out of duty, honor, oath and love of country.


    "Certified Jeep Junky!"


  5. #5
    "Don" Cilino jeepmudbogger's Avatar
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    As far as I know, its the original. I can hold it in my hand and with a little pressure, move the lever up and it will spring back. It's not sloppy or loose, it sits right in place but I can move the lever by hand. It has been sitting for roughly 6 months (give or take some), so I think to be on the safe side, I am going to get a new one because I'm not sure how bad the diaphragm is or will be..

    But, I did get it to go in and bolt properly. It took me a minute to figure out where the lobe of the cam was but it went in.
    *DECEASED* 1976 CJ-7, AMC 304/T150, 33" x 12.50 Dayton Timberline AT's, Stock AMC 20 rear and Dana 30 front both with 2.73's.

    1994 YJ, 2.5L, 5 speed, 2" body lift, 31x10.50's, CJ front clip

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