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  1. #1
    Join Date
    May 2020
    Location
    west sussex
    Posts
    24

    Smile Erratic fuel gauge

    Tank, sender and gauges were all fitted when I took over this Pilgrim Sumo build project.

    Lots of problems resolved, many due very poor standard of work already carried out.

    Can anyone suggest best way to stabilize the fuel gauge, it moves around with petrol in tank,( ie if tank half full the gauge jumps between 1/4 to 3/4 )

    I recall early mk1 minis had a stabilizer of some sort fitted to back of gauge between feed from tank sender to stop this problem, is this something that might work to sort my problem or is new gauge faulty?

    Any advice appreciated.

    PS: Nearly ready for AVI, just gearbox to be sent for rebuild and hood to fit.

  2. #2
    Join Date
    Aug 2004
    Location
    Christchurch, NZ
    Age
    60
    Posts
    2,470
    Are you sure it is slosh that you are seeing? Does the gauge stabilise correctly when you are just cruising along? The gauges I have seen (Smiths type) are heavily damped and unlikely to show short-term changes in fuel level, just the average.
    Cheers

    Myles D-W

  3. #3
    Join Date
    Jun 2004
    Location
    Northampton
    Posts
    1,882
    Is it rev dependant? The higher the revs the higher the reading? If so, sounds like it needs a voltage stabiliser.
    Dek

  4. #4
    Join Date
    Sep 2010
    Location
    Nova Scotia
    Posts
    965
    Be very careful about adding a capacitor across "anything"! It's basically the same as a battery, and if the sensor shorts, it can provide a high amperage spark that could cause the fuel tank to explode. Here's a post I made about it a while back"

    http://www.cobraclub.com/forum/showthread.php?t=49776
    John

    “A prudent person profits from personal experience, a wise one from the experience of others.”

  5. #5
    Join Date
    Apr 2005
    Location
    Worcestershire
    Age
    45
    Posts
    2,358
    Quote Originally Posted by TurboFreak View Post
    Tank, sender and gauges were all fitted when I took over this Pilgrim Sumo build project.

    Lots of problems resolved, many due very poor standard of work already carried out.

    Can anyone suggest best way to stabilize the fuel gauge, it moves around with petrol in tank,( ie if tank half full the gauge jumps between 1/4 to 3/4 )

    I recall early mk1 minis had a stabilizer of some sort fitted to back of gauge between feed from tank sender to stop this problem, is this something that might work to sort my problem or is new gauge faulty?

    Any advice appreciated.

    PS: Nearly ready for AVI, just gearbox to be sent for rebuild and hood to fit.
    I thought the needles had the equivalent of dampers on them to stop them bouncing about all over the place?

    When you turn the ignition on, does the needle shoot up straight away, or move slowly?
    Regards

    Craig Perry

    No, I'm not "repairing" it, I'm fine tuning its performance.

  6. #6
    Join Date
    Nov 2006
    Location
    Shropshire/Wales Border
    Age
    50
    Posts
    6,057
    Assuming you cannot resolve the underlying issue, then the other solution would be one of these. As well as "antislosh" it helps to tune the sender/gauge to the tank. Useful particularly if your tank is an odd shape

    https://www.spiyda.com/fuel-gauge-wizard-mk3.html
    Lloyd B
    Current: Crendon #54 in build - 427 Side Oiler/Cobrajet Heads/Dual 600cfm Holleys/4 speed toploader/Vintage cast knock on wheels
    Dedion Dax/Clarkson 383 Chevy with roller 4/7 swap cam, AFR195 heads - SOLD

  7. #7
    Join Date
    Oct 2018
    Location
    Shipston-On-Stour
    Posts
    385
    Quote Originally Posted by Lloyd Barnes View Post
    Assuming you cannot resolve the underlying issue, then the other solution would be one of these. As well as "antislosh" it helps to tune the sender/gauge to the tank. Useful particularly if your tank is an odd shape

    https://www.spiyda.com/fuel-gauge-wizard-mk3.html
    Yep, I fitted one a while back. Bit of a fiddle to get the settings right but with some patience and a look at their YouTube instructions it is not too challenging. Although they supply it with a load of ‘near enough’ presets I found I had to enter the resistance values for each stage to get mine spot on but it is totally spot on and the anti slosh stopped the gauge from varying. Good product.

  8. #8
    Join Date
    May 2016
    Location
    Hockley ,Essex
    Age
    57
    Posts
    302
    If you have any suspicion with the voltage stabiliser,
    don't mess about, change a s a p otherwise there is a
    good chance that it will wreck any gauges that are on
    that circuit.
    Usually fuel & coolant temp gauges.
    Chris.

  9. #9
    Join Date
    May 2016
    Location
    Hockley ,Essex
    Age
    57
    Posts
    302
    If you have any suspicion that the voltage stabiliser
    is faulty,
    change a s a p otherwise it will probably wreck any
    gauges on that circuit.
    Usually the fuel & coolant temperature gauges.
    Chris.

  10. #10
    Join Date
    May 2016
    Location
    Hockley ,Essex
    Age
    57
    Posts
    302
    Don't know what happened there.

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