Valve flow for twin tanks
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Valve flow for twin tanks

  1. #1
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    Default Valve flow for twin tanks

    I have this valve for my twin tanks. It seems to work for my 400 horse 454, but I need to flow enough fuel for 700-800 hp. I'm considering upgrading to a 632 inch 800 horsepower motor. I would love to run a mechanical fuel pump, but I'm not sure what my options are going to be. Are there higher flow valves? Can I substitute a plain old T?


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    Senior Member DuaneHTP's Avatar
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    Eddie Marine #sf-100 works for me

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    Senior Member hihosilver's Avatar
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    I use a tee instead, no wiring or parts to worry about

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    I wondered about that. Both tanks seek level then right?

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    I'd like to run a mechanical fuel pump vs electric. Are you guys using which??

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    I use a electric pump...but the fuel switch could care less

  10. #8
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    I run a 496 for miles at 70-80 mph through that valve with no issues. If you want open flow, just use a tee with a ball valve at each tank, and tweak them until they pull evenly from each tank. Use 3/8 npt and you could support 1500 horsepower.


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  11. #9
    I'm No Expert Shaun's Avatar
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    Unless your tanks are bottom fed they will not self level.

    If you decide to remove that selector in place of a T make sure you install a Ball valve from each tank and try to get your lines from each tank exactly the same length. This will help ensure the tanks draw as even as possible and if they don't you can use the valves to adjust.

    My last river tip on the last cruise of the night i ended up emptying one of my tanks. When you drain one tank like that you end up with 0 fuel pressure. Luckily i had the ability to close off the empty tank and enough gas in the other to make it back.

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    if the lines tee below the tank level both tanks should level when the motor is off shouldnt they? Putting in a 632" motor and would like to run a mechanical pump and dont want to starve the motor.

  13. #11
    Renegade jet tunneljet's Avatar
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    This is the pump I used on my 800hp motor on e85. It worked great, even with the approx 30% more fuel required when running e85. Holley 12-454-20, Holley Volumax Fuel Pumps | Holley.

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    LP-25.com Infomaniac's Avatar
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    Quote Originally Posted by horsepowerjunkie View Post
    I'd like to run a mechanical fuel pump vs electric. Are you guys using which??
    Clay Smith mechanical pump
    If For Some Reason I Do Something Worthy Of Recognition. God Provided The Ability And Deserves The Credit.


    QE 439 Twin Turbo

  15. #13
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    Quote Originally Posted by Infomaniac View Post
    Clay Smith mechanical pump
    Just rigged a blown big block dual tanks. Put a T and #10 ball valves. Clay smith did a wonderful job drawing the fuel. Long inline filter before the pump
    If For Some Reason I Do Something Worthy Of Recognition. God Provided The Ability And Deserves The Credit.


    QE 439 Twin Turbo

  16. #14
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    What kind of ball valves are you guys using ?
    GD

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