Stalling/loss of power after getting after it.

Fuel and Air Systems

  1. skep419

    skep419 I'm the guy that likes SPAM

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    Took the kids to an ice cream joint the next town over tonight. When we left I got after it, short shifting into second and coasted. It died. I popped it into neutral and cranked for probably 15-20 seconds (turned onto a side road while still coasting) before it started. Gave it a quick look and everything seemed ok.

    Half way home there is a stop sign in the middle of nowhere. Set the line lock for a short little burnout. Ran out of fuel again and had to pedal it to keep it running.

    Got it home and the only thing I noticed is the fuel gauge attached to the carb line would wonder from 3-6psi. Never done that before but not the most trust worthy gauge.

    I had plans to move the fuel filter anyways but wondering if there are some things to look into before I start changing things.

    1969 Dart. 360 tank, 3/8 sender, 3/8 line to pump, carter high flow, Holley 750 mechanical.

    Haven’t really done anything with the fuel system in a long time. Has ran awesome.

    Can’t work on the car so here I am typing away.


    Clogged fuel filter/Fuel filter hoses collapsing
    Bad pump
    Shitty gas
    Clogged fuel tank vent
    Crap in the carb

    580A7F3A-52E7-45FD-BD27-56775F29FE77.jpeg

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  2. dICKj

    dICKj Well-Known Member

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    The float bowls are running empty. Lack of fuel flow, probably dirt in filter or in regulator.
     
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    • Dana67Dart

      Dana67Dart The parts you don't add don't cause you no trouble FABO Gold Member

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      Was it hot out?
       
    • skep419

      skep419 I'm the guy that likes SPAM

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      high 70’s low 80’s?
      Never had a problem even on 90+ days.
       
    • Dana67Dart

      Dana67Dart The parts you don't add don't cause you no trouble FABO Gold Member

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      My dart stock 273, does the same thing when it is hot out, 80s up and engine is at temp.
       
    • shittyslant6

      shittyslant6 Well-Known Member

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      Im not too good with carburetor wizardry, but to me it sounds like its running out of fuel.(well no shit)
      Anyway, in california at least I have heard of carburetors just clog and the metal turn into a weird oxidized mush on the inside because of the high ethanol/alcohol content in the gas. (especially if it sits for long periods of time w/ fuel in the bowls) Maybe some of the passages are just full of crap and not getting the right amount of fuel into the engine. If not, I would look for the same stuff in the fuel pump, filter, lines, etc. Just clean everything out and make sure its clean. if there is nothing, its something else out of my range of knowledge.
       
      Last edited: Apr 5, 2021
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      • krazykuda

        krazykuda Well-Known Member FABO Gold Member How-To Section Editor

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        I would move the in-line filter to the pressure side of the fuel pump, not on the suction/gravity fed side... It has more affect on fuel flow on the suction side than on the pressure side...
         
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        • RustyRatRod

          RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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          I think you kinda covered it all in your last little paragraph.
           
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          • yellow rose

            yellow rose Overnight Sensation FABO Gold Member

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            Those Holley regulators can go bat Crap crazy. It’s a bit difficult to monitor fuel pressure without a gauge in the car or a data logger to record it.
             
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            • skep419

              skep419 I'm the guy that likes SPAM

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              I'd ditch it completely if I new the carter high flow wouldn't over power the needle and seat in the holley 750dp. (might be worth testing)
              dart%204.jpg
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              Forgot to look at the fittings on the fuel pump before I left home. Ordering parts to ditch the braided line. Thinking its 1/4npt going into the pump. (hard to tell from the pictures I can find)
               
              Last edited: Apr 6, 2021
            • Fawkes

              Fawkes Well-Known Member

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              I had a similar issue in the past using a Jeg's fuel regulator that looks just like yours. The gauge would read 6 psi but after driving the car around for awhile and getting it hot in traffic it would start to run rough, every time i would check the gauge and it would be at like 3 psi. I ultimately just removed the regulator entirely and it solved the issue.
               
            • Dana67Dart

              Dana67Dart The parts you don't add don't cause you no trouble FABO Gold Member

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              For shits and giggles, TEMPORARILY put a clear filter after your regulator but before your carb.

              Look for the fuel level in the filter to go to almost nothing when it is at 3psi, then refill and return to 5
               
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              • shittyslant6

                shittyslant6 Well-Known Member

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                Actually, this sounds just like the problem the rotsun had in that new episode of roadkill. Same symptoms, and it was the fuel pressure regulator drawing too much fuel from the pump and the pump not beig able to keep up.
                 
              • skep419

                skep419 I'm the guy that likes SPAM

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                Moved the fuel filter. (Old one wasn’t plugged) replaced it with fuel injection hose/clamps. Made a new line up from the pump. Ditched the fuel pressure regulator and gauge. Used an old chrome dual feed setup I had laying around. Thinking I’m going to make my own dual feed lines with a T fitting.

                No leaks. Fuel isn’t dripping from the boosters so the carter high flow isn’t over powering the needle and seat.
                Weather won’t allow a test drive.
                 
              • shittyslant6

                shittyslant6 Well-Known Member

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                Simplicity is always better.
                 
              • AJ/FormS

                AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s

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                I run that Carter P4007040/ 80gph/8.7psi to my dual-feed 750DP and they are a match made in heaven. No regulator.No insulation.
                You'll be fine
                 
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                • skep419

                  skep419 I'm the guy that likes SPAM

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                  Gave it a 10 mile assault tonight. So far so good. Thinking it had to be the regulator. Fingers crossed it’s fixed for good.
                   
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