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  1. #1
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    Fuel pump pressure

    Looking at 2 holly fuel pumps. One is 1.5 - 4 psi and the other is 3 - 7 psi, I think. Carburated 3.0 looper. Which would be best? Both self regulating, up to 300 hp motors. Would the 1.5 - 4 psi be enough without a regulator? Would the 7 psi need to be regulated? The 7 psi one flows a little more per hour.

  2. #2
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    Not an OMC guy, but compare flow rates at the same pressure, and voltage.
    The 3-7 psi may flow the same amount @ the same pressure as the 1.5 to 4 psi pump. Unless they are rated at top psi pressure.

    All this should be in the specifications.

    I like the 3-7 pump. Then regulate it if you have to. jmo
    Last edited by W2F a V-King; 02-22-2019 at 07:06 AM.
    James H. W2F a V-King... Want 2 Fly a V-King

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  3. #3
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    In the factory manual they call for not less than 3psi @ 800 rpm in gear.
    And like W2F above mentioned, you want to check flow rate of pump, Gallons Per Hour.
    Last edited by SS Minnow; 02-22-2019 at 05:10 PM.

  4. #4
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    I use the Holley red pump with Holley blue pump regulator set at 3-4 lbs on carbs, works for me ...

    Jay
    Jay @ JSRE

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    Ok. I guess the question should be, will the 1.5 - 4 psi one work without a regulator? I know 7 psi is pushing it without regulating.

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    One was 25 gph other was 35 gph if that helps.

  7. #7
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    Quote Originally Posted by Gorilla0178 View Post
    Ok. I guess the question should be, will the 1.5 - 4 psi one work without a regulator? I know 7 psi is pushing it without regulating.
    1.5-4lbs shouldn't need regulated, then again merc says 5lbs pressure , on other hand omc uses quite bit more gas than merc also , in my experiences.

  8. #8
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    I would absolutely use a regulator. Will be a far more consistent pressure at the injectors or carbs. My 2 cents.
    Larry Gempp Jr.

    Proud HydroStream Powertour Member

    2017 RXP-X 300
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    2004 HydroStream Venom - 3.4 Etec - August, 2011 S&F Boat of the Month

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    Im gonna, I have a regulator already...

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  11. #10
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    Larger of the two listed pumps with a regulator set to specification... Done
    James H. W2F a V-King... Want 2 Fly a V-King

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