NAS 110 Fuel Gauge Problem Solved
I recently had the fuel pump replaced in my 110 and when I got the truck back from the shop, the fuel gauge was reading 1/4 to 1/3 too low. When the tank was full, it was reading under 3/4 tank.
So I inspected the fuel level sensor wiring and its two connectors mating up to the chassis harness. This did not reveal any issues nor correct the problem. I then moved on to the fuel harness grounds, which are bundled with others and bolted to the left rear body, behind the speaker enclosure. It is a straight blade machine screw with a 8 mm nut on the underside.
I loosened up the bolt, brushed the terminals and body with a wire brush and tightened it all up again. The gauge now reads correctly.
See the Oct 1993 NAS 90/110 Workshop Manual Part 5 Section 86 Pages 25 and 39 for Chassis harness data and drawing. See Section 86 Page 71 for the Fuel Tank Level Indicator circuit diagram.
Land Rover Club of San Diego
1993 NAS D-110 #55 (GNUTRUK)
2004 Disco II (DSCO DOG)