Access the fuel sender
(pictures 7-9)The fuel sender inside the fuel tank can cause problems, which in
turn results in an inaccurate fuel gauge. On rear-engine Buses, it’s
forward of the engine. If you know where it is, an access panel can
be carefully cut above it (do not do this unless you know exactly
where to cut). When you’ve found it, detach its feed wire and
connect it to an earth point on the Bus, then switch on the ignition.
The fuel gauge should read full because the feed is earthed. If not,
use a multimeter to measure the voltage of the feed wire. If there is
none, check all fuses, then route a new feed wire to the sender unit.Test the sender
(pictures 10-12)If the earthing test outlined in the last step resulted in the fuel
gauge reading full, then the problem may lie with the sender unit,
which will have to be extracted. Use a hammer and blunt chisel
to carefully unscrew the sender unit and remove it from the fuel
tank. After removing it, suspend it so that the float is free to move,
then use a multimeter set to resistance and attach its probes to the
two terminals on the top of the sender unit. Move the float and the
resistance reading should change. If it doesn’t, consider replacing
the sender unit.7 8
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