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Thread: CJ7 Re-build V2

  1. #101

    Crossed lines....

    Quote Originally Posted by Iron Mike View Post
    let us know what happens when you bypass the fuel filter, sounds like its running to lean, not enough fuel flow thru a filter ment for the higher pressures of fuel injection would do that.

    I had a MG back in the day and put on a big bore Webber with electric choke, on the engine was warmed up the choke would shut off and the engine die because it was getting less fuel, the choke was adding extra fuel. I switched to a manual choke and re jetted the carb, as it was running to lean. Ran like a champ after that.

    Ran fuel straight in and it will run for days that way.

    So i picked up a new fuel pump and a carb rebuild kit (and jet kit, and spare carb gaskets, and admjustment screwa just in case). But it was bugging me this all worked before i ripped it all apart. Got under then Jeep and pulled on the lines but no give. They are pinched where i transition from rubber to vinyl. Lowered the tank and uncrossed the lines routing them better and bolted it back up.

    All of a sudden i can smell fuel again. So i likely dont need the other parts but i have them so....

    Sunday i should know for sure.
    Last edited by DamnCj; 08-17-2018 at 10:00 PM.
    1985 CJ-7 Custom (Flat fendered CJ,YJ,XJ,TJ...)
    Picked n Parted 1987 YJ
    Sold 1998 XJ
    RIP 1981 CJ-7 Limited Edition Laredo

  2. #102
    Sweet, got to love the easy fixes. Nothing wrong with having a spare parts.

  3. #103
    So in an effort NOT to cut up my brand new quick connects i opted to replace the fuel pump and rebuild the carb 1st.
    Guess what....no dice.
    Did notice the choke ground was crap. Re did that. Nope.
    Pulled the plugs....light brown and no issues. Checked gap. Nope.
    One wire was a bit sloppy so i tightened it up. Nope.
    Notice my old coil cable is working itself off at the distributor. Tightened it down but i will replace it this week.

    If anything its worse now. Only ran for a minute then died.
    (sounds awesome)
    Restart after 2 minutes is all boggy and sounds like crap. Like 4 cyl....

    Guess i am ripping out the fuel filter....tomorrow.
    1985 CJ-7 Custom (Flat fendered CJ,YJ,XJ,TJ...)
    Picked n Parted 1987 YJ
    Sold 1998 XJ
    RIP 1981 CJ-7 Limited Edition Laredo

  4. #104
    On a side note, i tested all my gauges with the rewire. Everything worked including my gas and temp.
    Now that its bolted up fuel and temp dont work.
    Im going to LOOSE IT soon. Damn CJ!
    1985 CJ-7 Custom (Flat fendered CJ,YJ,XJ,TJ...)
    Picked n Parted 1987 YJ
    Sold 1998 XJ
    RIP 1981 CJ-7 Limited Edition Laredo

  5. #105
    Quote Originally Posted by DamnCj View Post
    On a side note, i tested all my gauges with the rewire. Everything worked including my gas and temp.
    Now that its bolted up fuel and temp dont work.
    Im going to LOOSE IT soon. Damn CJ!
    Fuel pump and sending unit connected in the tank, or connected electronically in any ways? Bad ground or incomplete circuit from the new wiring loom causing the pump to shut off?

  6. #106
    Quote Originally Posted by Iron Mike View Post
    Fuel pump and sending unit connected in the tank, or connected electronically in any ways? Bad ground or incomplete circuit from the new wiring loom causing the pump to shut off?
    Mech pump on the block....
    Grounds are all new.
    Bucket testing in 20 min. Soon as im done my Cigar....(shhh dont tell my wife)
    1985 CJ-7 Custom (Flat fendered CJ,YJ,XJ,TJ...)
    Picked n Parted 1987 YJ
    Sold 1998 XJ
    RIP 1981 CJ-7 Limited Edition Laredo

  7. #107
    Quote Originally Posted by DamnCj View Post
    Mech pump on the block....
    Grounds are all new.
    Bucket testing in 20 min. Soon as im done my Cigar....(shhh dont tell my wife)
    OEM pump or aftermarket, had a new mechanical pump fail,on me on my 64 Plymouth had a pin sized hole in the diaphragm, last thing I check cause it was a new mopar pump. Hole was small enough to not allow gas to leak,out but to draw air in causing air/ vapour lock in the fuel,line to the carb, could also be drawing air in at a fitting or joint.
    Last edited by Iron Mike; 08-20-2018 at 07:24 PM.

  8. #108
    Quote Originally Posted by Iron Mike View Post
    OEM pump or aftermarket, had a new mechanical pump fail,on me on my 64 Plymouth had a pin sized hole in the diaphragm, last thing I check cause it was a new mopar pump. Hole was small enough to not allow gas to leak,out but to draw air in causing air/ vapour lock in the fuel,line to the carb, could also be drawing air in at a fitting or joint.
    Perfect. How do i test for that!

    No fuel at the carb.
    Primed the pump both ways, filled the filter backwards (and the line to the tank based on the amount of fuel it took.
    Ran for a minute then died.

    Bypassing everything to run from the bucket to test the pump now.
    1985 CJ-7 Custom (Flat fendered CJ,YJ,XJ,TJ...)
    Picked n Parted 1987 YJ
    Sold 1998 XJ
    RIP 1981 CJ-7 Limited Edition Laredo

  9. #109
    Well. Pump works. Runs for days (by the ounce)direct from the can.
    Reconnected with primed lines and she dies after a minute.
    Has to be the filter or lines to the tank.......
    1985 CJ-7 Custom (Flat fendered CJ,YJ,XJ,TJ...)
    Picked n Parted 1987 YJ
    Sold 1998 XJ
    RIP 1981 CJ-7 Limited Edition Laredo

  10. #110
    Quote Originally Posted by DamnCj View Post
    Well. Pump works. Runs for days (by the ounce)direct from the can.
    Reconnected with primed lines and she dies after a minute.
    Has to be the filter or lines to the tank.......
    And the winner is........pinched fuel line!
    PITA to get to that with a full tank......
    Well now i know at least.
    1985 CJ-7 Custom (Flat fendered CJ,YJ,XJ,TJ...)
    Picked n Parted 1987 YJ
    Sold 1998 XJ
    RIP 1981 CJ-7 Limited Edition Laredo

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