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What is it now? Carburetor? or fuel pump? engine wont idle correctly

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  • What is it now? Carburetor? or fuel pump? engine wont idle correctly

    Hello All,

    Well as you guys know I have a never ending problem with my engine. When I first bought the car it was kinda doing the same thing. I have replace the electric fuel pump for a Carter 7 psi and I have also replace the old Holley 600 for a new Edelbrock 1406 with automatic choke and i still have the problem that now my new carburetor is over floating and is not stable on idle, as you can see in the video the engine works fine in high idle but when is idling and I step on the gas it chokes, and i can also see the carburetor pushing the gas back to the line once the car is off.

    I have replace almost the whole damm engine:

    Chevy 350 5.7

    Carter fuel pump 7psi
    Edelbrock 1406
    3/8 Steel Fuel line
    Fuel regulator
    Fuel sending unit with pickup
    I line my gas tank (seal it inside)
    HEI distributor with coil
    Spark plugs
    Spark plugs wires
    Temperature sensor
    Chrome headers Headers
    Chrome Valve covers
    New radiator hose
    Power steering pump
    I repair my power steering gear box
    Yes I change the transmission oil/filter and seal.
    and i have more more i have done....

    Most of this things i mention here doesn't have anything to do with whats happening to me but just wanted to show how ungrateful my engine is

    Here is a video you can see when i step on it, wants to turn off, We have play with the carburetor and cannot get it to idle fine for 5 minutes:

    Here is the last video I took yesterday after changing the Valve covers:

    Heres some pictures of what I have done lately to it:

    Line my tank inside and painted outside

    Summit chrome valve covers

    Install my headers

  • #2
    What is it now? Carburetor? or fuel pump? engine wont idle correctly

    Custom work on the headers so the power steering gear box wont touch the headers.

    Repair and install power steering gear box.

    Wiring harness for my 10" electric fan infront of the 2 circuit cooler.

    A/C CONDENSER and a 2 circuit cooler for tranny cooling and power steering return line.

    New fuel sending unit

    Steel Braided hoses


    • #3
      Before you go any farther, pull a couple of spark plugs and take a look at them. If they are black with soot then you are way rich. Otherwise it's got to be a timing/advance or float problem.



      • #4
        I think is a float problem. That video was taken right after i change the spark plugs. Gas was overflowing from the top of the carb and sending the fuel back to the tank after engine was of. I have edelbrock on the line now lets see what they say. I even got 2 opinion from 2 different mechanics and they say is the carb.


        • #5
          Yanqui, you need to talk to Jeff, our resident expert on these problems. Also, this thread would have been better (for your sake) posted in the Techinal Forum. However, I'll say this much, I've been there. this is one of the reasons I returned to using the mechanical fuel pump on my motors and keep a spare handy.

          I really loved your comment about the motor not being grateful (LOL)! Yes, the Studebaker 259/289 can be a real ungrateful witch till she gets what she wants! And she will give you hell till then, LOL!
          Home of the famous Mr. Ed!
          K.I.S.S. Keep It Simple Studebaker!
          Ron Smith
          Where the heck is Fawn Lodge, CA?