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Fuel Sending unit

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by MKeen, Oct 29, 2001.

  1. MKeen

    MKeen Registered Member

    Jun 20, 2001
    Likes Received:
    Tulsa, OK
    78 Blazer here and the Gas guage when tank is full is pegged to the right. When I am running on fumes it reads between 1/2 and 3/4 mark. I am thinking either a sending unit or a faulty ground somewhere. Is there any test I can do to verify, as I really don't want to buy a sending unit if I don't have to.
  2. HarryH3

    HarryH3 1 ton status Author

    May 31, 2000
    Likes Received:
    Georgetown, TX
    The sending unit should measure near zero ohms when the tank is empty and about 90 ohms when the tank is full. The gauge reading high is usually a bad connection in the circuit, which increases the resistance.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
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