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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » Fuel sender float length

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    7/24/2022 1:56 PM  #1

    Triton
    FYI Addict

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    From: Rosenberg, Texas
    Registered: 6/24/2014
    Posts: 146

    Fuel sender float length

    I have an aftermarket fuel gauge and a stainless fuel sender with a good float and a 1970 22 gallon fuel tank. The gauge works but the levels of fuel are off such as the gauge reads full when the tank is only 3/4s full. After pulling the sender out and bench testing it I noticed that the float arms length goes to full at about the height of 3/4s of a tank. It seems that the float arm should be a couple of inches longer to compensate for the 22 gallon tank. The float arm seem that it would work well for the smaller 16 gallon tank. I notice that fuel senders without the low fuel light are sold as 1965 to 1970 units. I am thinking of extending the float arm a couple of inches to create better arch of the float for the taller 22 gallon tank. Has anyone had this issue?

    1965 Notchback, 8.8 rear end, T-5, Diy Front Struts, Shelby Drop, Bumpsteer Kit
     

    7/24/2022 4:25 PM  #2

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,248

    Re: Fuel sender float length

    A 1970 specific sender is what you need. If the ad says 65-70, shop elsewhere.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    7/25/2022 10:36 AM  #3

    Texas!
    FYI Addict

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    Registered: 6/27/2014
    Posts: 231

    Re: Fuel sender float length

    You can bend the float's arm so that the float will be higher when the arm reaches its maximum up travel.

     

    7/25/2022 3:26 PM  #4

    BobE
    Senior 24-7 FYI Addict

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    From: White Plains, NY
    Registered: 4/04/2013
    Posts: 2,639

    Re: Fuel sender float length

    Agree w/Texas!,  The 22 gallon tank is higher so if using the original 65 sending unit, this would be expected.
    For me the real issue would be the empty level indication, running out of gas is PITA.

    65 Fastback, 351W, 5-speed, 4 wheel discs, 9" rear,  R&C Front End.
     

    7/26/2022 10:34 AM  #5

    rpm
    Senior 24-7 FYI Addict

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    From: Bakersfield, Ca
    Registered: 9/17/2013
    Posts: 3,651

    Re: Fuel sender float length

    BobE wrote:

    For me the real issue would be the empty level indication, running out of gas is PITA.

    Bingo! I to have a 22 gallon tank and used the Bullet Bob sender template to adjust the arm. I've got ~2½ gallons when the gauge reads E, which is about the only reading I care about.
     

    Bob. 69 Mach 1, 393W, SMOD Toploader, Armstrong  steering, factory AC.
     

    7/26/2022 11:49 AM  #6

    Ron68
    Senior 24-7 FYI Addict

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    From: Mukilteo, Washington
    Registered: 4/01/2013
    Posts: 1,575

    Re: Fuel sender float length

    Bearing Bob wrote:

    BobE wrote:

    For me the real issue would be the empty level indication, running out of gas is PITA.

    Bingo! I to have a 22 gallon tank and used the Bullet Bob sender template to adjust the arm. I've got ~2½ gallons when the gauge reads E, which is about the only reading I care about.
     

     I did the same on my tank in my 68. I did the extension on the pickup with the larger inlet screen, I calibrated the arm per BB's template and I installed the adjustable voltage regulator on the fuel gauge and adjusted it so that when it reached the E mark (bar) I have exactly 2 gallons left in the tank.

    68 coupe - 351W, 4R70W, 9" 3.25 -- 65 convertible - 289 4v, C4, 8" 3.00
     

     

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