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Thread: 1/4 tank and wont go over

  1. 18th October 2011, 07:35 PM #1
    shamat
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    1/4 tank and wont go over

    Hi All,

    I recenlty purchased a 1997 LD Discovery 1 V8i as a weekend toy for the family. When I picked it up I put in about 35 liters of fuel (as the fuel light was on). It gave me just over 1/4 of a tank so I thought "that seems about right".

    I drove it for a bit, to just under the 1/4 tank mark, then today put in another 35 litres, expecting to now have around 3/4 of a tank, only to find the guage still only shows just over 1/4 tank!!

    Are thre any common issues with the LRD1 guages, sender units etc that would manifest in this way?

    Any help or nudge in the right direction would be greatly appreciated.

    Cheers.
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  2. 18th October 2011, 07:55 PM #2
    sheerluck Guest
    Sounds like it's normally an earth problem, see here
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  3. 18th October 2011, 08:03 PM #3
    shamat
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    Thanks Dave.
    I had read about the bad earth issue but discounted that as a cause as the Temp Guage appears to be functioning normally. I figure if its an earth issue with the cluster then both guages would have issues, but ive been wrong before!
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  4. 18th October 2011, 08:20 PM #4
    sheerluck Guest
    Quote Originally Posted by shamat View Post
    Thanks Dave.
    I had read about the bad earth issue but discounted that as a cause as the Temp Guage appears to be functioning normally. I figure if its an earth issue with the cluster then both guages would have issues, but ive been wrong before!
    Not necessarily. It seems there's an earth for the sender unit (if I'm reading RAVE correctly!), as well as the joint earth for the gauges themselves.

    Get yourself a copy of RAVE from the shop at the top.
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  5. 18th October 2011, 08:28 PM #5
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    bee utey
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    The pump assembly is quite easy to remove if you can lift the load floor carpet. Undo the hatch in the floor, check the sender float on the pump unit.
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  6. 19th October 2011, 07:56 PM #6
    shamat
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    Thanks. I'll check that out this weekend.

    What are the chances of it being the sender as opposed to the guage?
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  7. 19th October 2011, 08:10 PM #7
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    bee utey
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    Quote Originally Posted by shamat View Post
    Thanks. I'll check that out this weekend.

    What are the chances of it being the sender as opposed to the guage?
    The easiest way to test the gauge from the point of the tank is to lift the floor hatch then fit a jumper lead between the two finer wires in the pump plug. Leave the ignition on but don't run the engine, the gauge should run up to full.
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  8. 21st October 2011, 07:41 PM #8
    shamat
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    tested the gauge as suggested by bee utey and it checks out OK.
    Now I guess I'll fill it to the brim and see what the reading is.. If still not reading full I guess a new sender is in order.
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  9. 21st October 2011, 08:06 PM #9
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    Utemad
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    Before you fill it up. Since you know the wiring and gauge are ok.
    Pull the pump/sender out of the tank and move the float arm up and down and see what the gauge does.

    If it works then the float is not floating. If it doesn't work then the sender unit is stuffed.

    If the sender is stuffed then you will need a whole new pump unit. If the float is stuffed you can probably adapt something.
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  10. 23rd October 2011, 08:54 PM #10
    shamat
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    Quote Originally Posted by Utemad View Post
    Before you fill it up. Since you know the wiring and gauge are ok.
    Pull the pump/sender out of the tank and move the float arm up and down and see what the gauge does.

    If it works then the float is not floating. If it doesn't work then the sender unit is stuffed.

    If the sender is stuffed then you will need a whole new pump unit. If the float is stuffed you can probably adapt something.
    I'll give that a go when I get back home next week. Currenlty interate for work and the list of things to do when I get back is building.
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