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Posted by: David in VA Jun 15 2018, 06:49 AM

Does anybody know where the fuel gauge grounds? I tested my sender and it seems to be working fine, grounds are connected to the back of the gauge and it reads empty with the key off and full with the ignition on. Never goes down though, I'd like the check the ground connection but don't know where it is.

Thanks
David

Posted by: 914Sixer Jun 15 2018, 07:21 AM

Ground crown is in the upper left corner behind fuse block

Posted by: David in VA Jun 15 2018, 07:48 AM

Got it, thanks very much.

David

Posted by: toolguy Jun 15 2018, 07:50 AM

all the gauges share a common BRN ground loop wire. . that the gauge will read full
should indicate the ground is good.
When did the gauge work correctly last? what happened since?
sounds more like a sender rheostat issue.

Posted by: David in VA Jun 15 2018, 08:24 AM

Thanks toolguy, I'm trying to eliminate the various components. The gauge hasn't worked since I bought the car. The previous owner put in a new gas tank and sender. I tested the sender and it seems to be working, next step is to jump the green wire that goes from the sender to the gauge and eliminate that. Does that make sense?

Appreciate your help, for some reason having a fuel gauge that doesn't work really irritates me.

David

Posted by: toolguy Jun 15 2018, 10:22 AM

3 wires at the sender. .. brn = frame ground, black = low fuel warning to dash light, green is the normal gauge wire to the gauge. . a red/white is the power at the gauge. .

For your gauge to always read full, my educated guess is your most probable cause is the float rheostat in the sender. Or the green wire is shorted to ground somewhere in the wiring harness.
As the float goes up and down there should be a resistance change between the brown and green terminals on the sender, which in effect controls the needle position of the gauge. . sounds like the green wire always has full ground potential. . [zero ohms resistance]
Last option = did someone rewire / reconnect the wires incorrectly on the sender unit plug??