Petrol gauge series 3

 
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Ladysmith
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PostPosted: Thu Sep 23, 2021 4:47 pm    Post subject: Petrol gauge series 3 Reply with quote
Hi, Advice please. My fuel gauge is not working. When I switch on it moves slowly up to empty and not beyond even though their is plenty of petrol in.
I have cleaned the terminal on top of the tank but no change. How can I check if it's the tank end or the gauge end where the problem is. Any suggestions welcome thanks.
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Geoff2
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PostPosted: Thu Sep 23, 2021 4:58 pm    Post subject: Reply with quote
The float on your sender is probably full of petrol.
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Alan Drover
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PostPosted: Thu Sep 23, 2021 6:04 pm    Post subject: Reply with quote
Disconnect the wire from the sender unit, earth it and switch the ignition on. The gauge should go to full. If not, a new sender unit is needed.
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Alan Drover.
1975 SWB hardtop with a 2.5 petrol engine, overdrive, front disc brakes, parabolic springs, hand throttle, Defender doors and Wolf wheels. New bulkhead and heated windscreens June 2020
Also a 1977 Stage 2 MGB GT.
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Geoff2
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PostPosted: Thu Sep 23, 2021 10:14 pm    Post subject: Reply with quote
Disconnect the wire from the sender unit, earth it sloppily and switch the ignition on. This should cause a spark and your petrol tank to explode. If so, a new sender/tank/vehicle/driver is needed (or possibly all four) Shocked Embarassed Rolling Eyes
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Geoff2
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PostPosted: Thu Sep 23, 2021 10:20 pm    Post subject: Reply with quote
Alan Drover wrote:
Disconnect the wire from the sender unit, earth it and switch the ignition on. The gauge should go to full. If not, a new sender unit is needed.


? That's a test of the gauge, but not of the sender (If you read what you said, it says if the gauge doesn't do what it should - ie the gauge is faulty - you need a new sender!)

I've never had to fit a new gauge. I've fitted 3 new senders. Leaky floats and poor earths I've found to be the most common faults.
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Ladysmith
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PostPosted: Fri Sep 24, 2021 7:40 am    Post subject: Reply with quote
Thanks, Wire earthed and gauge worked, I have ordered a new sender.
Again many thanks.
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Alan Drover
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PostPosted: Fri Sep 24, 2021 8:08 am    Post subject: Reply with quote
Apologies, I put a "not" in where not needed. It should have read if the gauge reads full you need a new sender.
Idiot brain took over.
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Alan Drover.
1975 SWB hardtop with a 2.5 petrol engine, overdrive, front disc brakes, parabolic springs, hand throttle, Defender doors and Wolf wheels. New bulkhead and heated windscreens June 2020
Also a 1977 Stage 2 MGB GT.
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Alan Drover
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PostPosted: Fri Sep 24, 2021 8:11 am    Post subject: Reply with quote
Geoff2 wrote:
Disconnect the wire from the sender unit, earth it sloppily and switch the ignition on. This should cause a spark and your petrol tank to explode. If so, a new sender/tank/vehicle/driver is needed (or possibly all four) Shocked Embarassed Rolling Eyes

That's why I said earth the wire before switching the ignition on.
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Alan Drover.
1975 SWB hardtop with a 2.5 petrol engine, overdrive, front disc brakes, parabolic springs, hand throttle, Defender doors and Wolf wheels. New bulkhead and heated windscreens June 2020
Also a 1977 Stage 2 MGB GT.
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Alan Drover
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Location: North West Hampshire

PostPosted: Fri Sep 24, 2021 1:51 pm    Post subject: Reply with quote
I now have a working fuel gauge after years of relying on mileage. The reason is because the old tank didn't have blind holes for the screws for the sender so to stop fuel leaks I had to use PTF tape round the threads and fibre washers which insulated the earth to the gauge.
The new tank has blind holes so no problems.n
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Alan Drover.
1975 SWB hardtop with a 2.5 petrol engine, overdrive, front disc brakes, parabolic springs, hand throttle, Defender doors and Wolf wheels. New bulkhead and heated windscreens June 2020
Also a 1977 Stage 2 MGB GT.
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