Time for a fuel return line…

General Mopar Tech Discussions

  1. Huicho417

    Huicho417 Well-Known Member

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    Happy Thanksgiving everyone!! Very happy this year for everyone’s advice I have gotten throughout my Coronets restoration.

    My car is finally running good after battling issues with brakes, transmission linkage and leaks. I also tuned it and at 16 degrees BTDC I have 20 mercury inches of vacuum, idling at about 650 rpm.

    My issue is that every now and then I have an extended crank before it starts. Initially on the morning it starts great, but then I have to pump it a little to get it started. Not a big issue but it’s getting annoying. I upgraded to an edelbrock four barrel with matching intake and installed a bypass fuel regulator but have not done return line. I am now seeing all signs for vapor lock with the head end setup. Bubbling in the filter and hissing when I remove the gas cap.

    What is the best routing for a return line? My plan is to come off the pressure regulator with a 1/4” fuel hose an maybe run along the side supply line. I also found a fitting on Amazon that I am thinking about installing onto the fuel sender. That way I can remove the sender and not worry about shavings falling into the tank. What do y’all think? Any recommendations?

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  2. dadsbee

    dadsbee FBBO Gold Member FBBO Gold Member

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    Hissing when you remove the gas cap would indicate, to me anyhow, that your tank vent lines are plugged... or your car is supposed to be using a vented cap. That info I don't know for your year/model.
     
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    • Huicho417

      Huicho417 Well-Known Member

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      I do have a vented gas cap. Is it possible the cap is not set up correctly to vent? Any way I can check that?
       
    • dadsbee

      dadsbee FBBO Gold Member FBBO Gold Member

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      Leave the cap off and see if the bubbles go away. Sounds like the cap is not venting and to suck fuel the tank needs air behind it to "fill" the tank. Sounds like it's sucking that air from a loose fuel line prior to the pump instead... so it's showing up in the fuel filter.
       
    • davek

      davek Well-Known Member

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      my question is how did it run before the new carb and intake?
       
    • Huicho417

      Huicho417 Well-Known Member

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      I did not run the car with pre previous 2 barrel carb and intake. I purchased the car two years ago and decided to make the upgrades rather than have to mess with the old parts.
       
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