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Gas Gauge on "E" Gauge or Sender?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ford_assassin, Dec 16, 2003.

  1. ford_assassin

    ford_assassin 1/2 ton status

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    Gas Gauge on \"E\" Gauge or Sender?

    Hey guys, my gas gauge has been broken since I bought the Blazer 4 months ago.

    It always rests on "E". When I first bought it I disconnected the boot connection under the drive door on the frame. With the key in the "ON" position the needle pegged out at "3 o'clock" like it should. When I reconnected it the gauge seemed to work for one tank of gas and then the next fill up it stayed on "E" again.

    Anyone have any ideas what the deal it? It has only worked on other time since then, and stopped again after the motor was shut off.

    I am really hoping its not the sender, the local dealer wants damn near $300 for a new one. Not sure if its because its a Blazer or because I have the optional 31 gallon tank. Either way that's a big chuck of change.

    Any help is thanked in advance and welcomed.
     
  2. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    Re: Gas Gauge on \"E\" Gauge or Sender?

    check the ground on the tank
     
  3. HarryH3

    HarryH3 1 ton status Author

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    Re: Gas Gauge on \"E\" Gauge or Sender?

    With a mostly full tank, check the resistance between the wire from the sender and ground. If it's close to 90 Ohms, then the gauge is the likely culprit. If it's 0, then there's a short to ground somewhere. Find that and you'll be golden. /forums/images/graemlins/cool.gif

    On our rigs 90 Ohms = Full and 0 Ohms = Empty. The reading from the sender is linear, so 45 ohms would be 1/2 tank. /forums/images/graemlins/thumb.gif
     
  4. R72K5

    R72K5 Banned

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    Re: Gas Gauge on \"E\" Gauge or Sender?

    i vote for float with hole in it, or flat fell off arm, or just plain bad unit,

    if it was wire from sender to guage that came off or broke then the guage would peg to F
     

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