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Thread: Fuel Pump Issue??!!

  1. #1
    Senior Member RACING JUNKIE
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    Fuel Pump Issue??!!

    I think I need to buy & new fuel pump. My Holley manual is failing (170GPH) I think & is not enough apparently. I am getting sufficent pressure, but not enough flow at this point?? Here is a brief current setup: Sumped original tank w/ mallory filter @ tank all 10an to pump. Then 8an to reg w/ filter inbetween. from reg 6an to carb which is quickfuel 950hp. Reg is a BP w/ 6 an back to tank. BBC w/ P&P heads, teamG, solid lunatti, about 500Hp. all steel 69 Camaro w/ Th350 & stall.

    Symptoms: off idle is fine. mid starts to fail & when secondaries are open for a duration, I get some flat acceleration & poping like it is lean. W/O Acceleration is poor. Carb is new (and larger than last), reg is new, new filters, plugs & wires new. floats set, jets correct, PV (only in primary) checked & is fine. Sound like a pump issue??

    I need some electric pump advice. How is Holley blue/black?? I cannot afford the magna flow right now... but I want to get going soon. Have not had to buy a pump in a long time!! Any feed back is appreciated!! Scooter
    "I would walk through hell on Sunday before I fear the enemy"

  2. #2
    Member MASTER JOURNEYMAN
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    ive seen valve spring issues cause similar prob.just a thought

  3. #3
    Member JUNIOR BUILDER
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    Yes I would use an on engine valve spring tester & compare your readings against what you set them up at first since this is a very quick check.Then I would do a "fuel can test" to establish what the output of your fuel system actually is before forking any cash on anything,both these tests are free.

  4. #4
    Senior Member DYNO OPERATOR
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    Quote Originally Posted by desoto30
    Yes I would use an on engine valve spring tester & compare your readings against what you set them up at first since this is a very quick check.Then I would do a "fuel can test" to establish what the output of your fuel system actually is before forking any cash on anything,both these tests are free.
    How do you do that fuel flow test on a mechanical engine driven pump? Do you use a tee in the line and then start the engine? and at what RPM, FIRE! FIRE!

  5. #5
    Member JUNIOR BUILDER
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    how I would go about this would be,hook the carb to an electric pump,with another fuel supply,connect a hose to the output side of the mechanical pump & run the engine @ chosen rpm & then look into the container each time & see how much fuel is there.Yes I totally agree with you to have a fire extinguisher at hand & I would suggest a buddy to assist also

  6. #6
    Senior Member DYNO OPERATOR
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    Quote Originally Posted by desoto30
    how I would go about this would be,hook the carb to an electric pump,with another fuel supply,connect a hose to the output side of the mechanical pump & run the engine @ chosen rpm & then look into the container each time & see how much fuel is there.Yes I totally agree with you to have a fire extinguisher at hand & I would suggest a buddy to assist also
    Thank's Desoto30, I was just kidden about the fire, but your method sure is creative. You get an A for that answer by me sir.

  7. #7
    Senior Member RACING JUNKIE TheYellaBrick's Avatar
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    Stock or aftermarket fuel tank ? Stock tank will have smaller ID fuel line and a high demand engine will not allow sufficient flow to keep that carb full.
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  8. #8
    Senior Member RACING JUNKIE
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    Thanks everybody. I want the Holley manual gone no matter what. The motor makes around 500hp, w/ one 4150 950hp flatform. Be it the new carb being starved or the manual pump bad, I just feel an electric is necessary. I have heard of vane style or a g-rotor style.... the g-rotor I am told is better, but requires a BP (which I have). There has to be some folks out there w/ BBC's running Holley blue or Black... on motors like mine... what is your feed back & is it enough? Keep talking to me...


    Double -D,

    I have a stock 69 Camaro tank that is sumped, w/ 10AN to a Mallory filter, 10AN to current pump. Then 8AN to reg, & 6 AN to carb. 6AN is BP.
    "I would walk through hell on Sunday before I fear the enemy"

  9. #9
    Senior Member RACING JUNKIE
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    Desoto-

    Ok, I re-read what you are saying & now I understand it. This is mainly a wild street car driven on the street most of the time. I just don't see a pivotal point w/ valve train to cause this. I have done a visual on the heads & confirmed a .26/.26 int/ex valve lash... look good. No visible issues detected in condition of springs & valve train. Off idle is fine... it has symptoms in upper mid to full throttle. I agree with you, as you probaly know more than i anyways. heres my point: I hate mechanicals... this car warrants a electric in my opinion anyways. So no matter what, I am going to pick a pump- what do you think about holley blue/black? Thanks!! Scooter
    "I would walk through hell on Sunday before I fear the enemy"

  10. #10
    Senior Member RACING JUNKIE TheYellaBrick's Avatar
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    Quote Originally Posted by Rigsby
    Double -D,

    I have a stock 69 Camaro tank that is sumped, w/ 10AN to a Mallory filter, 10AN to current pump. Then 8AN to reg, & 6 AN to carb. 6AN is BP.
    Sounds like a tired pump alright. Time for that electric !
    Just don't forget that tip over OFF switch !
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