Thread: faulty fuel gauge or sender

either or of the above appear to be faulty on my early 110 v8. the gauge reads full when the ignition is turned on, when i know that the fuel tank is only at about half. about a week ago it started reding full but sometimes was correct. now its full all the time. where do i start to look and how do i correct it?

First place to look is the earth on the gauge. This is earthed by a wire with a tag under one of the nuts holding the gauge and from memory goes onto a stack of tags under one of the other gauges, and then to an earth on the firewall. It may simply be a loose nut.

You can often confirm this is the problem if the reading changes when you switch the instrument lights on or off - if this affects the gauge reading then the gauge earth is certainly the problem.

Other possibilities are the sender or the gauge as you suggest, but neither are prone to problems - much more likely is a wire rubbed through the insulation and intermittently shorting to earth. The tank earth can also be a problem, although I think this would show low readings not high.