Dual Four fuel lines
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Dual Four fuel lines

  1. #1
    Senior Member sturat's Avatar
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    Default Dual Four fuel lines

    Ok, after reading another thread I saw it mentioned that when running dual carbs you should have tow regulators or at least that is how I read it. Some one had dual carbs and a comment was made only one regulator?
    I just put in a 514 in my Sanger and it has dual carbs and this is the first time I have run them. So I am now starting to second guess myself. I do not want something to happen to my motor as you all know how much time and money it takes to build these things especially if I could avoid a problem for a few bucks. I am thinking about mounting a 4 port regulator on the back of the back carb and running a fuel line from there to each bowl is this safe or should I do something else?????
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    mo balls than $cents$ IMPATIENT 1's Avatar
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    get a 13202 aeromotive regulator and you'll never have to worry bout it again best regulator there is!

    Dare to be different, if it turns out great you can claim you planned it that way.

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    Senior Member Boat 405's Avatar
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    I like running a magnafuel or barry grant 4 outlet regulator with one -10 inlet. Like these.



    or



    Boat 405.

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    gn7
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    Or you can save half the money and run the big Holley 4 port.



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    Last edited by gn7; 09-17-2009 at 08:24 AM.

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    just a ski boat with bark Carnivalride's Avatar
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    FWIW I run a single BG 4-port regulator and haven't had any issues with it.


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    steelcomp was here
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    Quote Originally Posted by gn7 View Post
    Or you can save half the money and run the big Holley 4 port.
    Yep. Not a damn thing wrong with them.

    Last edited by scott foxwell; 09-17-2009 at 08:24 AM.
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    Senior Member sturat's Avatar
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    Quote Originally Posted by gn7 View Post
    Or you can save half the money and run the big Holley 4 port.
    I ordered the Holley 12-707 and it should deliver today.
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    Quote Originally Posted by sturat View Post
    Ok, after reading another thread I saw it mentioned that when running dual carbs you should have tow regulators or at least that is how I read it. Some one had dual carbs and a comment was made only one regulator?
    My concern was that although that install is very clean there are a few 90* turns after the regulator (take a look at the routing when you get a chance) depending on fuel pump capacity, hose length and size there (maybe) a problem with the install using a single 2 port regulator. The four ports will have much better fuel distribution IMO ,but then again it may not be a problem.

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    Senior Member sturat's Avatar
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    Quote Originally Posted by Sleeper CP View Post
    My concern was that although that install is very clean there are a few 90* turns after the regulator (take a look at the routing when you get a chance) depending on fuel pump capacity, hose length and size there (maybe) a problem with the install using a single 2 port regulator. The four ports will have much better fuel distribution IMO ,but then again it may not be a problem.

    S CP
    I am going to use a four port for sure but just got worried that was a bad idea. a few bucks now is much better than thousands later
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    Senior Member sturat's Avatar
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    Quote Originally Posted by Sleeper CP View Post
    My concern was that although that install is very clean there are a few 90* turns after the regulator (take a look at the routing when you get a chance) depending on fuel pump capacity,

    S CP
    I see what you refered to now. I went back and looked at the picture and makes sense. I am trying to avoid any issue as i do not want what happend to squirt to happen to me.
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  13. #11
    Spiral out MikeF's Avatar
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    Lets see......one engine, one carb, one fuel line to carb, one regulator, one fuel pump, one line from tank...............works if properly designed, properly adjusted and maintained.

    Why......(for conversation sake)

    Would the fuel demand/volume change if you add another carb to the same engine?.......(other than the extra fuel used up by the accelerator pumps)


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    I use this setup all the time. There are a few variations.

    Even for alcohol. With this bypass and a belt driven pump. The idle pressure is 7 or 8 and ramps up to 12 - 15 when running.

    I'm a firm believer of feeding the carbs and then bypassing. No other type of regulator other than a bypass. This one an Enderle but the BG diaphram type works well.

    The "T" is 1/2 in and 3/8 out each side.


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    Quote Originally Posted by MikeF View Post
    Lets see......one engine, one carb, one fuel line to carb, one regulator, one fuel pump, one line from tank...............works if properly designed, properly adjusted and maintained.

    Why......(for conversation sake)

    Would the fuel demand/volume change if you add another carb to the same engine?.......(other than the extra fuel used up by the accelerator pumps)

    I would think that with the addition of two more needle and seats and 4 more jets at the end of the fuel system there maybe an increased need for volume to feed them. Kind of like adding a second sprinkler at the end of your garden hose.

    If you have a system that is just fine for 1 carb if you add the second one it could be to much for the pump to keep up with. Many times the pump is just fine but the small size pick-ups from the tank or reduced size fuel lines or restrictive fuel filters or 5/16" electric tank selector or to many 90* in the system and lets not forget friction loss (length of run) is/are the problem(s).

    I've never been a big fan of 90*'s in the fuel system:


    This billet Holley regulator free flows in-excess of 1.5 gallons per minute

    1.5 gal x 6.5 lbs x 60 (minutes) = 585+ lbs fuel per hour/.5(BSFC)= 1,170 hp

    It's been a while since I measured the flow but that's the minimum I ran through it (14-16 years ago) with a BSFC of .4 that's enough fuel to support 1,462 hp.

    Edit: To finish the thought on the regualtor... not all duel ports will flow that much fuel. 1/2" in two 1/2" out.

    Wheres a recommended install from Barry Grant on the duel carb system:


    I sometimes think there's allot of over-kill here but better safe than sorry.

    Sleeper CP
    Last edited by Sleeper CP; 09-17-2009 at 12:03 PM.

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  16. #14
    gn7
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    Quote Originally Posted by MikeF View Post
    Lets see......one engine, one carb, one fuel line to carb, one regulator, one fuel pump, one line from tank...............works if properly designed, properly adjusted and maintained.

    Why......(for conversation sake)

    Would the fuel demand/volume change if you add another carb to the same engine?.......(other than the extra fuel used up by the accelerator pumps)

    Your right. A single reg can handle it. So long as the single reg can flow the fuel requirement. The vast majority of 2 port regs cannot. This one can supply 2 Dominators on a blower. I believe Areomotive has on too. Two many people just don't think about flow requirements and just throw a reg at it and call it good.
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