Mechanical fuel pumps

Discussion in 'Tech Discussion' started by DavesJimmy, Jun 9, 2018.

  1. DavesJimmy

    DavesJimmy Full Access Member

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    My 76 GMC's mechanical fuel pump has 3 lines attached to it.. i have an edlelbrock mechanical fuel pump i want to install but it only has 2 connections? Do I just delete one of the lines and cap it? Or will the edlelbrock just not work period? Thanks for the info.. Screenshot_20180529-091753.png Screenshot_20180529-091941.png
     
  2. 1987 GMC Jimmy

    1987 GMC Jimmy Full Access Member

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    The extra is the return line. You can cap off the line and the port on the pump, but if it were me, mechanical pumps are so cheap that I’d just get the three port unit.
     
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  3. yevgenievich

    yevgenievich Full Access Member

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    Third line i believe is return. At least it acts as such on my 85. Should be able to cap it
     
  4. Rusty Nail

    Rusty Nail Build the wall - deport them all!

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    Don't cap the return line dude....buy a three port pump.
     
  5. Honky Kong jr

    Honky Kong jr Super Sarcastic Man

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    Especially if he’s running an Eddy carb too. They are fussy with over pressuring them, I wanna say steady 6-6.5 is their happy spot.
     
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  6. yevgenievich

    yevgenievich Full Access Member

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    Actually overpressure is a good point. Apperently most recent aftermarket fuel pumps appear to put out over 10psi. Not sure on edelbrock pump exactly but I ran them on two vehicles with no issues at the time
     
  7. Craig 85

    Craig 85 Supporting Member Supporting Member

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    If you run a 2 port pump, you could run this fuel filter. It has a return. Wix #33041.

    [​IMG]
     
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  8. DavesJimmy

    DavesJimmy Full Access Member

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    Thanks for the info guys... I'm wondering if fuel pressure is why it dies out when i slam on the gas. Its a new crate 350, timings set, carbs tuned, no vacuum leaks.. so o was gonna try a new guel pump..im stumped. I havent checked fuel pressure.. hmmmm:confused:o_O
     
  9. Snoots

    Snoots Supporting Member Supporting Member

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    Just what make and kind of carb(s) do you have?

    Quick 'throw yer head into the windshield' stops could be one of 2 tings.

    Desperate stops can contribute to emptying the fuel bowl which would: starve the engine or, flood the engine.
     
  10. DavesJimmy

    DavesJimmy Full Access Member

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    Its an edlelbrock avs thunder series there 4x4 model.

    Screenshot_20180510-162202.png
     
  11. Honky Kong jr

    Honky Kong jr Super Sarcastic Man

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    It’s an Eddy thing easy fix is put a Holley on it lol I know I’m gonna get shit for saying that. Lol Easy Curt it’s a joke then again in my eyes it ain’t.
     
  12. Snoots

    Snoots Supporting Member Supporting Member

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    That explains a lot.
    Had my problems with Holley too. That's why I love my Q-Jets. Har, har, hardy har har.
     
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  13. Honky Kong jr

    Honky Kong jr Super Sarcastic Man

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    Slobberjet to the rescue, I think not. Lol
     
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  14. Rusty Nail

    Rusty Nail Build the wall - deport them all!

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    Never seen that before. Looks like it may be handy for something...sometime....maybe.
    Thanks for the part # !
     
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  15. DavesJimmy

    DavesJimmy Full Access Member

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    Its hard to believe that a $430 carb would be that shitty right out the box :/ i guess i could try to throw a holly on there just to see if thats it.
     

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