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  1. #1
    Join Date
    Aug 2018
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    2,800

    Default Fuel regulator/bypass

    Which one are yall using on a 602 with the rear mounted fuel pump?

    After chasing carb problems for the last 2 weeks, our local crate builder believed we had the wrong regulator, too small he said.(it came with the car)

  2. #2
    Join Date
    Oct 2007
    Posts
    922

    Default

    rear mount belt pumps deliver quite a bit of volume and a crate engine does not use much volume so the regulator and return line are critical ---also do not forget the fuel cell vent needs to be adequate and clear

    as for the pump---do you know what size it is 300-400-500?? this is determined by the length of the gear
    for crates we use the 300

    if the pump is bigger than a 300 definitely use a a regulator with a bleed

    the aeromotive stuff is real nice but the universal bypass regulator from them does not have a bleed---it works well with a 300 pump but if you are larger I recommend something with a bleed

    make sure there are no dips or kinks in your return line (-8 minimum -10 is better)

    Brad
    www.race-1.com

  3. #3
    Join Date
    Aug 2018
    Posts
    2,800

    Default

    Thanks Brad! This is kinda baffling us. It was a 3 race old Hendren 602, tuned on his dyno. We've adjusted the floats both ways and adjusted the front squirters, but nothing seems to help. We've checked the filter and lines and there were no issues. Our local builder adjusted the fuel pressure from 6.5 to 7.5 to no affect.

  4. #4
    Join Date
    Oct 2007
    Posts
    922

    Default

    OK lets get more specific---originally you just asked about a regulator
    What is the actual on track problem?
    What fuel are you using?

    Brad
    www.race-1.com

  5. #5
    Join Date
    Aug 2018
    Posts
    2,800

    Default

    Yeah, because our local builder said we were using the wrong one.(it was changed tonight)

    Our car has been stumbling at the end of the straightaway.

    We are using VP x85.

  6. #6
    Join Date
    Oct 2007
    Posts
    922

    Default

    did changing the regulator fix your problem?
    I am going to interpret your "stumbling" as a misfire
    on E85 a high end misfire is a rich condition
    we do not like dead head regulators for E85 that have 3/8 pipe fittings as they will go lean at high end---and I am going to assume that is why your local builder didn't like the regulator you were using but I do not think that was the "stumble"

    I hope your problem went away but I am guessing that it did not

    Brad
    www.race-1.com

  7. #7
    Join Date
    Aug 2018
    Posts
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    Default

    Dont really know as it doesn't do it until it has a load on it.

    We had the regulator with the return on it but our local builder said it was too small, so we purchased a bigger one.

    I just find it odd that it had 3 races on it with no problem or at least according to the prior owner ( we did verify that it was dynoed by Hendren)

  8. #8
    Join Date
    Oct 2007
    Posts
    922

    Default

    have you called Steve Hendren to ask specifically about the situation?
    he is pretty easy to talk to

    Brad
    www.race-1.com

  9. #9
    Join Date
    Aug 2018
    Posts
    2,800

    Default

    Quote Originally Posted by brad hibbard View Post
    have you called Steve Hendren to ask specifically about the situation?
    he is pretty easy to talk to

    Brad
    www.race-1.com
    Yes, he helped us sort out the regulator.

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