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Hot Rods Accelerator pump issue?

Discussion in 'The Hokey Ass Message Board' started by nobrakesneeded, Jan 12, 2022.

  1. nobrakesneeded
    Joined: Mar 28, 2006
    Posts: 135

    nobrakesneeded
    Member
    from Hempstead

    Carb rebuilt on SBC because the car had been sitting for a couple years with very minor use.
    Now having problem with car starting after sitting overnight. Spray a little ether and it'll start and run. Shut off and restart after warm or drive and restart, and no issues.
    Accelerator pump?
     
  2. BJR
    Joined: Mar 11, 2005
    Posts: 7,473

    BJR
    Member

    Before you start it when it's cold take the air cleaner off look down the carb and pump it once or twice and see if the accelerator pump squirts gas down the carb
     
    hrm2k and nobrakesneeded like this.
  3. larry k
    Joined: Feb 23, 2009
    Posts: 424

    larry k
    Member

    What kinda carb Jew got ???
     
  4. nobrakesneeded
    Joined: Mar 28, 2006
    Posts: 135

    nobrakesneeded
    Member
    from Hempstead

    Edelbrock
     

  5. oldiron 440
    Joined: Dec 12, 2018
    Posts: 2,826

    oldiron 440
    Member

    Accelerator pump or float level....
     
    nobrakesneeded and hrm2k like this.
  6. SEAAIRE354
    Joined: Sep 7, 2015
    Posts: 424

    SEAAIRE354
    Member

    What’s the air temperature? Is the choke working?
     
    Johnny Gee and jaracer like this.
  7. nobrakesneeded
    Joined: Mar 28, 2006
    Posts: 135

    nobrakesneeded
    Member
    from Hempstead

    60s to 70s. Choke is working. Acting as if there is no gas, that's why I'm thinking accelerator pump
     
  8. Mimilan
    Joined: Jun 13, 2019
    Posts: 1,106

    Mimilan
    Member

    Put a phenolic spacer under it.
    Edelbrock carbs are known for heat soak and the gas evaporates.

    If you're using a mechanical fuel pump [and in good condition] consider a low pressure [flow-thru] electric pump as a primer pump.
    Connect this inline before the mechanical pump.

    This ^^^^ is a modern gas.....Carburetor problem

    One last thing before you start spending............remove the fuel cap overnight to see if the tank is breathing properly and not siphoning back in the fuel lines.
     
    stillrunners and joel like this.
  9. nobrakesneeded
    Joined: Mar 28, 2006
    Posts: 135

    nobrakesneeded
    Member
    from Hempstead

    This setup has about 10k miles on it and only started about 3 months adter the carb was rebuilt.
     
  10. larry k
    Joined: Feb 23, 2009
    Posts: 424

    larry k
    Member

    Them old E Brock’s are kinda bad starting after sitting , if the pump is workin, then the fuel has evaporated , so the bowls need to be filled . I just have to live with mine !!!
     
  11. Welcome to modern gas. All my old cars do it.
     
  12. Mimilan
    Joined: Jun 13, 2019
    Posts: 1,106

    Mimilan
    Member

    Does it bog down when you mash the gas pedal?

    If not ......the accelerator pump is OK

    A failing fuel pump will syphon back [the check valves leak] and there could also be a blocked screen in the fuel pick-up.

    Modern fuels [especially winter blends] have a high butane percentage. This will vaporise with engine bay heat after the engine is shut down.[emptying the float bowl]

    Most carbs feed the accelerator pump from the bottom of the float bowl, and the jets further up [hence float levels]
    So a couple of pumps can sometimes get the engine to fire, BUT it won't run [you can do this until the battery eventually goes flat]
    This isn't a problem on modern EFI engines

    The fix is AVGAS or an electric fuel pump [or a cap full of paint thinners down the carb:D]
     
    nobrakesneeded likes this.

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