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Thread: Relay for fuel pump shut off

  1. #21
    Join Date
    Oct 2005
    Townsend, DE


    Alot of stationary military equipment is run this way. The hot to the fuel pump or diesel fuel cutoff solenoid relay is run from a oil pressure switch. In the case of military stuff you crank it until it builds oil pressure and then let the key go. If you let off the starter too soon it just dies. It sounds funny too, like your starting a car thats already running but it works. The downside to it is that the military equipment that had this was stationary so if it shut off it was just a pita. I would hate to think what it would be like on the highway and your a quart low and it shuts the truck off. For trucks and things they had a low oil buzzer so if you could find 2 different pressure value switches to buzzer first and shut off second it might be a idea.
    Having the bypass switch would be nice. On the military stuff we called it a battle short switch. In case the sensor got fubared it would still run.

    Hope this helped,
    1974 SIII Ex Mod

  2. #22
    Join Date
    Jul 2005
    Elizabethtown, PA


    I sent the inertia switch out on Wednesday. Did it make it to your desk?

  3. #23
    Join Date
    May 2005
    Allentown, PA

    Thumbs up Inertia Switch

    I got the inertia switch yesterday, I wired it up last night, now all I have to do is mount it. I also have the relays ready to go, it was a struggle mounting the low oil pressure switch as the thread was different than the original OEM switch. I was able to mount it on a separate port on the oil filter housing that is bolted to the block.
    Ken Heaton

    1972 Series III
    1963 MGB

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