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Fuel pump wiring question

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  • Fuel pump wiring question

    I'm installing a modern inertia switch in the trunk of my 65 coupe. All along I was planning on splicing it into the hot wire from the pump relay to the pump. Tonight I though about splicing it in the pump ground wire. Thoughts or comments welcome. I'm no wiring expert but I'm making I'm making good progress using the American Autowire restomod harness.
    Mark C ~
    M&M member #332
    1965 coupe - owned since '79
    1970 Mach 1 T-5 (export Mustang) - owned since '86
    http://mustangsandmore.com/memberpages/70MachT5.html
    "My '65 coupe is going back together"
    /___ ___ ___ \
    (]]]_ _ O _ __[[[)
    \_ o _ __ _ o _/
    |___| ...... |___|

  • #2
    IDK, but how are OEM inertia switches wired in vehicles from the past 20+ years? I think I'd locate a modern wiring diagram and wire yours the same way....?

    Ryan
    Quality means doing it right when no one is looking. - Henry Ford

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    • #3
      Either way should work. It interrupts the current, so as long as the pump or wire doesn’t get grounded you should be good.
      ----1999 F150 XLT Lariat Super Cab 4X4 5.4----
      -----1947 Lincoln Zephyr Coupe 5.0-----
      -----2005 Expedition Eddie Bauer 5.4----
      " Sometimes you fix the car, sometimes the car fixes you" Steve L.

      "Do not let anyone tell you it cannot be done. No challenge can match the heart and fight and spirit of America". President Donald J. Trump

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      • #4
        I would put the relay on the power side, just because in the event of a problem there’s less powered wire still live. The ground circuit can’t provide sparks.
        '70 Mach 1 - '72 Sprint - '94 F-150 XL -'97 E-150 - '18 Edge SEL AWD

        My Mach's restoration progress
        My Sprint's restoration progress
        ”Mercy for the guilty is cruelty to the innocent.” ~ Adam Smith

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        • #5
          I am going to have EFI in the 69 Coupe & I used a relay & an inertia switch also.
          Mike & Robin Grentus
          69 Mustang Coupe (project & future toy)
          08 Escape 4X4 (spare)
          00 Ranger Extd Cab 4X4 (my DD)
          99 Explorer Sport (wife's DD)
          14 Kawasaki Vulcan (wife's toy)
          M&M Member #- 890
          MCA #- 4549
          My 69 Coupe build album
          http://www.newyorkmustangs.com/forum...cs-t15096.html

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          • #6
            Well . . . every diagram I found had the switch on the power wire to the pump. So much for my brief foray into electrical engineering.
            Mark C ~
            M&M member #332
            1965 coupe - owned since '79
            1970 Mach 1 T-5 (export Mustang) - owned since '86
            http://mustangsandmore.com/memberpages/70MachT5.html
            "My '65 coupe is going back together"
            /___ ___ ___ \
            (]]]_ _ O _ __[[[)
            \_ o _ __ _ o _/
            |___| ...... |___|

            Comment


            • #7
              Lol!!!
              Quality means doing it right when no one is looking. - Henry Ford

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              • #8
                After reading your first post I was going to suggest a relay but it looks like you have it figured out!
                1965 Poppy Red Three Peddle Gear Banger
                347 Stock Block Pump Gas Street/Strip 10.44 @ 125.97 Old Combo
                363 Dart Block Pump Gas Street/Strip - 10.11 @ 133.17 so far

                2005 Torch Red Topless Three Peddle 12 valve Monster
                244 Stock Block Pump Gas Street /Street Much Slower


                Current CI Count - 103

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                • #9
                  It's not unusual for modern vehicles to utilize switching the ground off and on for "activating" the relays, but it's best to use the relay to turn the hot+ off & on, in the circuit you're controlling.
                  Just Sayin'
                  Gene
                  Last edited by horseballz; 08-12-2018, 08:23 AM.
                  To quote my big brother: "Gettin' Old Ain't For Sissies"
                  '68 coupe/5.0/T5
                  '69 F250
                  '56 Chebbie 3200 P/U
                  '03 Miata (wife's ride)

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