In reply to a message from jag4oliver sent Sat 26 Jul 2014:
Hi jag4oliver. First, are you absolutely sure that the
switch is your problem? There are 3 valves that switch
controls, which are more likely sources of trouble than the
switch. There is one fuel tank changeover valve, and 2
fuel return valves, at least in the series III. I would
check connections at these first. You can access the leads
for the return valves at the rear of you rear wheel wells.
There is a cover that needs to be removed on both sides,
that will give access to the bullet connectors. You can
disconnect those and check for voltage coming from the
wires coming out of the rear fenders/wings.
There is also the changeover valve located in the trunk,
near the fuel pump and radio antenna lift motor. All of
these should be receiving power when the switch is
depressed, and no power when the switch is out. If they
act as I describe, then it is probably not your switch, but
one or more of the valves themselves.
Removing the switch itself is not a difficult task. If you
have a series III like mine, you can carefully pry out the
small panel which hold it in the center pedestal. Be
careful though, as yours could be different. Mine is
an '81. I did this recently while trying to diagnose a
fuel problem on mine. But I would really encourage you to
check your voltages at the valves first. And even if you
get it there, it doesn’t mean they are working properly,
but it does tell you that the problem probably isn’t your
switch.
Another important point I should mention is that you make
sure you are getting voltage to the switch. This can
easily be done with the key on, and measuring at the switch
terminals. I don’ recall which terminal it is right now,
but with the switch out (off) you should have 12 V. at one
of the terminals to ground. I hope this helps. Good luck.
Matt
'81 XJ6, '91 XJS, '95 VDP. '99 S-Type–
The original message included these comments:
How to change fuel switch? Can you use one of the other
switches to replace the inop fuel tank switch?
jag4oliver
Windsor, CA, United States
–
Trilithon
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