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Old 19 May 2013, 11:28   #1
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Wema fuel gauge stuck on full!

It must be lying! I've never seen a full fuel gauge in my life!

Noticed today as we were heading out that the fuel gauge was stuck on full. Had a mess about with it just now, cleaning earths etc but its still stuck.....

I take it I'm going to need a new sender????
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Old 19 May 2013, 11:46   #2
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If you can disconnect the sender from the cable try that and the gauge should go to zero.
If the gauge does not move then it is not the sender.
If you have disconnected previously and accidently reversed the polarity then you will get a full indication so it is worth reversing to see if that is the cause.
Hope you have success
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Old 19 May 2013, 11:57   #3
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If you can disconnect the sender from the cable try that and the gauge should go to zero.
If the gauge does not move then it is not the sender.
If you have disconnected previously and accidently reversed the polarity then you will get a full indication so it is worth reversing to see if that is the cause.
Hope you have success
it should go to empty when you turn the ignition off ??
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Old 19 May 2013, 12:30   #4
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It does go empty when I turn the batteries off but straight to full when I turn them on.

Hasn't been touched since the boat was built so I'm thinking a broken wire somewhere.
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Old 19 May 2013, 13:27   #5
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It does go empty when I turn the batteries off but straight to full when I turn them on.

Hasn't been touched since the boat was built so I'm thinking a broken wire somewhere.
you would need to check the wiring on your rib, but usually the live feed goes to the gauge, then from the gauge to the sender, then from the sender to earth. It may be worth pulling the wire off the sender that comes from the gauge, see what the gauge does, then touch that wire to earth. If the gauges goes from full to empty, then it's likely to be a sender issue or a short to earth somewhere. Good luck tracing your wiring, most wiring I've seen in ribs and boats in general is horrendous
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Old 19 May 2013, 21:27   #6
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Which WEMA gauge is it?
If it's a euro spec gauge (0@empty to 190 ohms@full) then it sounds like a bad contact.

The WEMA gauge I just wired is a bit odd-the red is positive, blue is negative, and the black goes to the sender which isn't how most of the online wiring diagrammes show it. The other wires are different colour backlightswhich go to +ve.
The other side of the sender goes to a negative.
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Old 20 May 2013, 14:16   #7
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Give the sender a tap with a small hammer, they sometimes get stuck
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Old 20 May 2013, 16:59   #8
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that was the first thing i did biffer

a swift tap with a breaker bar but no joy

ill go down tomoro and try to rewire it
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Old 21 May 2013, 09:53   #9
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Fixed!!!! The sender wire was joined inside a conduit and was totally corroded.

Luckily it went into a junction box before it went into the cab so I simply tested it using a spare bit of wire
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Old 21 May 2013, 10:51   #10
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Fixed!!!! The sender wire was joined inside a conduit and was totally corroded.

Luckily it went into a junction box before it went into the cab so I simply tested it using a spare bit of wire
excellent, easy fix

may be worth having a look at the rest of the wiring sometime
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