Gas Guage Death
#1
#2
#3
Join Date: Mar 2008
Location: Pacific Northwest USA
Posts: 24,743
Received 10,757 Likes
on
7,101 Posts
Crawl up under the dash to gain access to the fuel gauge. You'll see a terminal on the guage with a light green/orange wire. Clip a wire to it. Turn key "on" and touch your wire to ground. The gauge should go to full. If not, your gauge is dead or it is not getting voltage from the solid green wire. The latter is not likely....or you'd see all the guages having a problem as they are in series.
If the guage is OK I suspect a problem with the change-over switch. Try jiggling it around, and/or check the connection at the back. Does the switch feel funny? If it feels spongy, that's a clue.
Sending units often fail but it would be odd to have them both fail at exactly the same time.
Cheers
DD
If the guage is OK I suspect a problem with the change-over switch. Try jiggling it around, and/or check the connection at the back. Does the switch feel funny? If it feels spongy, that's a clue.
Sending units often fail but it would be odd to have them both fail at exactly the same time.
Cheers
DD
#6
#7
Trending Topics
#8
Join Date: Mar 2008
Location: Pacific Northwest USA
Posts: 24,743
Received 10,757 Likes
on
7,101 Posts
You know....above the radio, the one for changing the fuel tanks
Cheers
DD
#9
Join Date: Mar 2008
Location: Pacific Northwest USA
Posts: 24,743
Received 10,757 Likes
on
7,101 Posts
#13
#14
My 85 XJ-6 had the same problem when I first purchased it, no reading at all. The plug behind the change over valve had come loose. Once I pluged it back in, everything worked fine. Hopefully thats all it'll take. Good luck.
__________________
Keith Hodges
Little Rock, Arkansas
85 XJ-6, 95 XJS 2+2 Conv 6.0 V-12
Drive them daily to make them last!
__________________
Keith Hodges
Little Rock, Arkansas
85 XJ-6, 95 XJS 2+2 Conv 6.0 V-12
Drive them daily to make them last!
#15
Join Date: Mar 2008
Location: Powell, Ohio U.S.A. 43065
Posts: 2,521
Likes: 0
Received 70 Likes
on
56 Posts
Apparently all of this discussion is over a typo, since the changeover valve in the trunk has absolutely nothing to do with the fuel tank sender reading. He meant to say that the harness connector at the back of the fuel changeover switch on the dash was not properly connected.
Damage to this connector can occur when one of the fuel return solenoids is faulty and drawing excessive amperage: there is no separate fuse for each solenoid, so the current draw can overheat the wiring connector at the changeover switch and damage the switch.
If I was working on that car, I would go to each sender individually and ground them, since that is where the faults are most likely. That also enables you to test the gauge and switch. Absent of a reading, Doug's gauge test is the next step. Still no joy and I'd pull the changeover switch and jump across the sender terminals to the gauge and bypass the switch.
You need a good wiring diagram, some time to accustomize yourself with it and learning to think like an electron, a 12v test light and a couple of jumper leads with aligator clips. There isn't anything you can't fix by yourself on a 1982 XJ6 if you are so equipped, and the need will arise more often than the appearance of accurate troubleshooting tips.
Damage to this connector can occur when one of the fuel return solenoids is faulty and drawing excessive amperage: there is no separate fuse for each solenoid, so the current draw can overheat the wiring connector at the changeover switch and damage the switch.
If I was working on that car, I would go to each sender individually and ground them, since that is where the faults are most likely. That also enables you to test the gauge and switch. Absent of a reading, Doug's gauge test is the next step. Still no joy and I'd pull the changeover switch and jump across the sender terminals to the gauge and bypass the switch.
You need a good wiring diagram, some time to accustomize yourself with it and learning to think like an electron, a 12v test light and a couple of jumper leads with aligator clips. There isn't anything you can't fix by yourself on a 1982 XJ6 if you are so equipped, and the need will arise more often than the appearance of accurate troubleshooting tips.
#16
el changeoveroo switcharoo
you can use Flossing String, nobody uses it anyway. double it and slide it behind each edge of the trip computer, pulling a little at a time. The trip computer is designed to be removed that way, it has a spring bracket on each side. If it refuses to come out, someone opened the brackets, so you will then have to remove the entire panel to get to the changeover switch.
The Floss string also works to remove the grille under the wipers. Same way.
Jose
#18
#19
#20
Kieth, I had a loose connection behind the switch on the dash also. After I pried off the aluminum plate that held the fuel tank switch (and the other switch), I noticed that the wires werent pluged in completely to the switch. I plugged it all back together, put a little black electric tape on it to hold them together, and now my guages are fully functional! Thanks again everyone for saving me time and money and keeping another happy Jag owner on the road with my series 3!