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Old 08-15-2012, 02:05 PM   #1
Scooby Specialist
Member#: 187936
Join Date: Aug 2008
Chapter/Region: MAIC
Location: Fairmont WV
97 Legacy w/12:1CR
07 WRB STi OTS Stage 2

Default Odd gas gauge behavior

I have an indecisive gas gauge.

When i fill up it goes up to full like normal, then within the first 100 miles it drops to E then slowly moves back towards a the half tank mark and bounces between there and the quarter tank mark until it gets down to ~1/8 of a tank and then it reads correctly until empty and I fill it up. I've tested both the in tank senders and they seem to be working fine. and this behavior is getting worse over time, in the past the gauge worked perfectly if it was below 40F outside and only acted odd in warmer weather.

Any ideas?
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Old 08-16-2012, 01:41 PM   #2
Uncle Scotty
*** Banned ***
Member#: 16200
Join Date: Mar 2002
OK buy Nates beans


sticking float arm???
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Old 08-17-2012, 12:37 PM   #3
Scooby Newbie
Member#: 69566
Join Date: Sep 2004
Chapter/Region: SWIC
Location: Glendale, AZ
98 Legacy Outback
Murder wagon


sounds like one or both of your senders are not working properly.. or you have a bad signal wire or ground to the tank. 90% of all electrical issues are caused by a bad ground.. My Top half sender just started acting up and I need to pull it. My gauge appears to read good down to half tank, then drops rapidly and 1/8th means empty.. Either the high side is faulty or has a crap ground and it's not reading 0 resistance at the half tank mark. And generally, I reset my trip meter and know I get roughly 300 +or- miles on a tank, but for some reason my fuel economy took a crap, and have left my self out of gas 3 times in the last month.. lol... When I do my 5spd swap next weekend I plan on pulling both senders, cleaning them and cleaning all the plugs and grounds..
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