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2 issues - carb and fuel gauge

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  • 2 issues - carb and fuel gauge

    Hi all,
    I need to order two idle mixture adjustment needles for my Autolite 4100, but NAPA doesn't have a listing for my FoMoCo tag number C5AF F. The carb is the same as the stock one from my original 1959 352 car. Ford (autolite) made a 1.12 venturi and a 1.08 venturi. I have the 1.12 on a 390 motor.

    Second question; Per the troubleshooting guide in my 1959 T-bird shop manual I found that my gas tank sending unit was bad. I bought a new and replaced it. My gauge now works but the needle fluctuates slowly between 1/4 full and 3/4 full. When I start the car it reads approximately correct at 3/4 full, then as I drive down a flat road it eventually went down to about 1/4. Can anyone tell me what might cause this?

    thx as always, Dave J

  • #2
    Originally posted by davidmij View Post
    ...My gauge now works but the needle fluctuates slowly between 1/4 full and 3/4 full. When I start the car it reads approximately correct at 3/4 full, then as I drive down a flat road it eventually went down to about 1/4. Can anyone tell me what might cause this?..
    As the Instrument Voltage Regulator ages it also tends to become erratic. OEM regulators work just like turn signal units, by heating a bi-meta strip. This is an inexpensive method for averaging 6 volts.

    You need to buy one of my solid state Voltage Regulators. Shoot me a PM and we'll arrange it. - Dave
    My latest project:
    CLICK HERE to see my custom hydraulic roller 390 FE build.

    "We've got to pause and ask ourselves: How much clean air do we need?"
    --Lee Iacocca

    From: Royal Oak, Michigan

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    • #3
      Originally posted by davidmij View Post

      I need to order two idle mixture adjustment needles for my Autolite 4100, but NAPA doesn't have a listing for my FoMoCo tag number C5AF F. The carb is the same as the stock one from my original 1959 352 car. Ford (autolite) made a 1.12 venturi and a 1.08 venturi. I have the 1.12 on a 390 motor.

      Dave J
      The FORD P&A Number is- C8AZ 9541-C (CM-722) if that helps.

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