Doesn't appear to be getting fuel

Fuel and Air Systems

  1. phaelax

    phaelax Well-Known Member

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    About 3 weeks ago, I drove my '73 duster with no issues. The following weekend I got a few blocks and the car cut out. I had to pump the gas many times before attempting to start to get it running but it would cut out almost immediately once in gear. I can idle fine and it revs up smoothly if in park/neutral. But once in gear I only move half a block at best before it stalls.

    The carb is a quickfuel and practically brand new, maybe a few thousand miles on it. Ignition system was redone this past fall, ditching the old ballast for an msd 6AL and new coil, plugs, and wires. The fuel filter itself isn't that old either. I'm thinking the fuel pump might be the culprit because I'm not really seeing any fuel from the carb's sight glass. I don't have a gauge on hand to check fuel pressure, but what should the psi be?

    Simply put, engine seems fine at idle but stalls when in gear.
     
  2. AAndrews

    AAndrews MOPAR .. Move Over, Plymouth Approaching Rapidly!

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    Do you have access to a glass fuel filter? Cheap and easy way to determine if fuel is getting to carb. When was the last time you checked the filter sock on the end of the gas tank pickup? If you have a restriction in the gas line or a bent line it could possibly cause this problem. When was the last time the car ran properly? What have you done to it since? Fuel pressure should be 5-7 psi.
     
  3. 69FBCuda

    69FBCuda I'm so confused! FABO Gold Member

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    Is it squirting? Sounds like ignition.
     
  4. diymirage

    diymirage HP@idle > hondaHP@redline

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    Quickfuels are basically holleys...real easy to set the floats at

    I would start by raising them and see what that does



    Also, crawl under there and inspect the jumper hose from the pick up to the fuel line
    It can collapse and stop the fuel supply, or Crack in which case you end up sucking air
     
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    • Dale Murry

      Dale Murry Member

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      could be the breaks are stuck on,
       
      Last edited: Mar 26, 2021
    • dano

      dano Evil Handy Man

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      Is the tank vented or vent system functional? what is the age of the filter on the end of the pick up? Original tank or replaced?
       
    • phaelax

      phaelax Well-Known Member

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      Hard to see, but the spray looks very light to me. But I couldn't see fuel in the bowl either after shaking the car.

      I originally had a clear filter, that was changed to a metal one a few years ago when engine was replaced. The car ran fine the week before this problem started, another reason I didn't think carb adjustment is needed. I've done nothing to the car since last time it ran. I drove it around town, came home and parked it in the garage. Took it out the following weekend and didn't get but a few blocks.

      I think fuel isn't getting to the carb. I'll see if I can pick up a clear fuel filter from the store tonight. It's cheap enough I don't mind replacing even if the current one might be good. If that checks out, I'll look at adjusting the floats.
       
    • diymirage

      diymirage HP@idle > hondaHP@redline

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      i dont think you get what he means with "squirting"

      look at the "pump shot" in this video




      that wont happen on an empty bowl

      you know, there are ways to test the fuel pump
      simply fill the bowl of the carb with gas and disconnect the fuel line
      route the fuel line into a cannister and fire up the car
      let it run for a measured amount of time...30 or 60 seconds

      then measure the amount of fuel in the cannister and times it by 60 (if you ran it for a minute) or 120 (if you ran it for 30 seconds) and you got you GPH fuel pump output

      of course, if there is no fuel output it could mean a number of things
      the jumper hose i mentioned before

      the can eccentric could have come off

      the pump itself could have failed

      the sock on the pick up could be clogged

      the fuel gauge could be faulty and the tank could be dry
       
    • phaelax

      phaelax Well-Known Member

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      Ok, replaced filter and it seems like it comes in spurts, no idea if that’s typical or not. Once the car warmed up the problem started. Fuel at the sight glass was fine at first, but once the stalling started, I noticed the floats lowered and I can no longer see any fuel (rocked it back n forth).

      https://youtube.com/shorts/fOPWxZWyVG0
       
    • AAndrews

      AAndrews MOPAR .. Move Over, Plymouth Approaching Rapidly!

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      You are not getting enough fuel. Ok , disconnect the inlet line from the fuel pump and run a rubber hose into a gas container.
      This will help eliminate the fuel tank and the gas lines as problem areas . If the gas filter fills up properly running from a gas can, you know the problem is not the fuel pump. Then reconnect the fuel line to the fuel pump and disconnect the gas line at the fuel tank and connect the rubber to it and feed the other end into the gas can. Running ok now? The problem is in the tank , possibly a clogged fuel inlet in the sending unit.
       
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      • phaelax

        phaelax Well-Known Member

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        I know the sending unit was replaced a few years ago, it was leaking when I went to get the exhaust done and we replaced it then. But I'll try your suggestion and report back.

        Should the fuel filter appear to be full all the time? (thats what I'd think to expect)
         
      • dadsbee

        dadsbee FABO Gold Member FABO Gold Member

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        Fuel filters never lose the air lock. How old is your fuel pump and what fuels have you been running that may have deteriorated the rubber diaphram. My car died one day after slowing to take a corner. I figured I'd jammed a float as it started back up and the Wife and I cruised 100 miles and made it back home. Next day it wouldn't start, no fuel. Piece of the diaphragm holding the check valve open..
        beefuelpumpissue 056.JPG beefuelpumpissue 057.JPG
         
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        • RedFish

          RedFish Well-Known Member

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          Vapor lock? If the fuel is boiling, vapor pressure beyond the pump can become higher than the pump relief. Liquid fuel wont flow again until enough pressure escapes through bowl vent, etc...
          I've watched a see through filter mounted horizontally at the carb empty and fill with liquid fuel in cycles after engine is good and hot. Thicker base gasket under carb and later model fuel line with filler vertically down near the pump cured it. Real gasoline helped also. Todays common unleaded seems to boil faster.
           
        • AAndrews

          AAndrews MOPAR .. Move Over, Plymouth Approaching Rapidly!

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          Yes, you should see the fuel filter full .
           
        • phaelax

          phaelax Well-Known Member

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          I only ever put 93 premium in the tank. I'm not sure about the fuel pump age, I can't recall if its the same one from my old engine or not. I have to go fix the chimney on my house first, big storm the other night ripped the top off and a few bricks.....
           
        • diymirage

          diymirage HP@idle > hondaHP@redline

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          did you check to jumper i mentioned?
           
        • phaelax

          phaelax Well-Known Member

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          No not yet.

          At first, it seemed like the filter filled up. After running about 5min I shut off and let the gas drain back out and restarted, never really filled back up again. The amount of fuel I saw in the filter seemed inconsistent, more so as the engine warms up. It only stalled once, but before it was mainly happening when in gear and I can't really test that with a gas can.

          So possibly still the fuel pump or vapor lock as Redfish explained also sounds plausible right now.
           
        • Demonracer

          Demonracer 71 Demon 00 Ram 16 Chrysler 300S 05 Caravan FABO Gold Member

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          Sounds like the diaphragm in the pump might be weak, or gone. As mentioned, take the line off at the carburetor & put it in a fuel can, then have someone turn the starter over & see what you have fuel wise.
           
        • 67cuda318

          67cuda318 Member

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          I think I agree. I had a pump go bad. When I put the inlet on a vacuum gauge and pumped it by hand, it would show suction, then it would not hold the vacuum. It could move fuel, as long as there was no air in the line. Once it was empty, it couldn't really move anything along.

          On the new pump, it held vacuum between pumps.

          I guess you can disconnect the inlet to the pump, and put a vac gauge on it, and see what it does after a few cranks.
           
        • phaelax

          phaelax Well-Known Member

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          I haven't had time to do anything further since last week, but I'm going to remove the pump and look at it. They're not super expensive (well, i guess the shiny ones from summit is)
           
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