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Thread: Fuel pump wont prime

  1. #1

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    Fuel pump wont prime

    I have a 88 ram 50 2.6l mikuni feedback carb. I put a new head on. I rigged up a funnel so i could load the carb with fuel.
    no matter what I do the pump wont prime. There is plenty of fuel in the tank the pump was working fine before the head work. The hoses were put back on the only way they will fit. When I prime the carb the engine will run perfect for a half minute then stall. I've loaded it several times the pump will not prime. What do I do now?
    Thanks
    Zion

  2. #2


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    Real stupid question but its the pump arm running against the cam lobe like its suppost to ?

  3. #3

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    Quote Originally Posted by Fordubishi View Post
    Real stupid question but its the pump arm running against the cam lobe like its suppost to ?
    Real stupid answer . I've thought about that. I guess its possible to stick it in there wrong. even tho I had the valve cover off when I installed it .
    Tomorrow I'll check that.
    Thanks

  4. #4



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    Filter is totally plugged, or you have the suction line to the vapor return pipe.
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  5. #5

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    Quote Originally Posted by camoit View Post
    Filter is totally plugged, or you have the suction line to the vapor return pipe.
    Its not the filter, the line isn't restricted. Its not really possible to get the mix matched if i tried.
    I must have gotten the pump ram on the wrong side of the cam. I didn't know it was possible.
    I had trouble getting it in. I didn't look close it when it slipped in.

  6. #6



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    its real easy to get the arm on the wrong side of the cam - been there done that. Been many years since I ran a mechanical pump since I went to a weber carb like almost 30.
    Pennyman1
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  7. #7



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    I do know that it will be hard as hell to stick it in there if it's on the pump lobe of the cam VS the heal.
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  8. #8

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    I took the valve cover off and saw the arm was missing the cam. I pried it over with a screw driver still didn't work. I remembered a hot summer day when My truck vapor locked and lost prime, I said to hell with it. I went to Napa they had a EFP kit with a lifetime warranty for $50. Once the fuel pump was installed and the whole was covered the work was complete. The truck runs great with a new head,new headers,new electronic cooling fan and electric fuel pump. It took only minutes to make a cover plate for the mechanical fuel pump.
    I used a sawall and cut the base off the old pump. I used tin snips to cut a gasket to stop the hole up. I drilled the holes for the bolts put some sealent on it and bolted it on. It looks good too.
    Thanks guys for the support.

  9. #9


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    Hope you got a fuel pressure regulator the factory carb only needs 3psi were as a aftermarket fuel pump will run around 7-9psi. you can pick an inline FPR cheap from most parts stores or Summit racing.

  10. #10

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    Quote Originally Posted by Fordubishi View Post
    Hope you got a fuel pressure regulator the factory carb only needs 3psi were as a aftermarket fuel pump will run around 7-9psi. you can pick an inline FPR cheap from most parts stores or Summit racing.
    Its working fine without a regulator. How would you know if there is a problem?

  11. #11


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    There is a chance to flood and push fuel through the needle and seat even with the fuel bowl full. Might never happen but for $30 its a cheap precaution. http://www.summitracing.com/parts/MRG-9710/

  12. #12



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    With the stock carb he wouldn't need the fpr, he would with a weber depending on the psi output of the pump and the distance from the pump to the carb. It doesn't hurt to have it as long as the fpr doesn't restrict the flow volume of the pump.
    Pennyman1
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  13. #13


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    Oops sorry you're right Pennyman I keep thinking you needed one if you did a electric fuel pump and forgot it was the weber that would probably need it not the stock carb.

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