Fuel Gauge replace/fix

[Takoradi]

‘84 Uniflite aft cabin gasser, 3 tanks with non-functional fuel gauges. The gauges themselves respond so I think they’re ok functionally which leaves me suspecting either the wiring or the probe. Clearance above the two 200gal saddle tanks is <6”.

In your accumulated experience, is it more likely that the wiring is the issue or the probe? If the probe, any ideas how to replace with such little clearance?

Tak

 

[sbman]

Are your tanks under the side decks in the engine room?

I'd check the probes with a multimeter before deciding to replace them, if they vary resistance with level, then it should be the wiring that is faulty. Most senders are variable between 33-240 ohms, although some manufacturers change that up a bit.

On my 77 there is quite a bit of wiring including a tank selector switch.