99 3.0 Fuel Guage acting up
So bought the truck in December, been doing some minor repairs; and had everything working (except the delayed oil gauge).
But I noticed once in a while the fuel gauge would be off, like I'd park at night with 1/2 tank, go to work in the morning with nearly full tank (I know I ain't lucky enough to get a visit from a gas fairy!) I blamed the temp changes; and it seemed to go away.
Now the last few weeks the gauge is way off. Fill up it's over Full, and stays there for ~100 mi. At about 200mi & 3/8-just short of /2 tank I filled up, took 16.5gal (so ~3gal left).
I connected my ScanGuage (An odbii reader) set to read fuel level, and it's just blank; so I'm guess ing this truck doesn't send that info on ODBii, or I need to tweak the settings.
So I start searching here, and all the posts say to pull a yellow/white wire near the tank, under the drivers door. When I crawl under there, all I see is a pair of connectors, in a Y shape, behind a plastic bracket. Some kind of wires going to what ever is in front of the fuel filter (little old master cylinder looking thing).
I also took the cluster out, pulled the anti-slosh unit out.
I obviously didn't find the right things to short because it never went to empty. with the anti-slosh unit out it read ~1/2 tank. I put an ohm meter on the R's in the unit, I think they read 1k, 3k, 500 (R1, R2, R3).
I think I have all the tools necessary to test everything outside the tank; I just don't know where to stick them!
Does anyone have pics/youtube of how I need to test? Was the big block of wires under neath the correct set to try to ground the yellow/white (top left wire)
Thanks for any help
Just found a video for a 90 SHO, says to cover the 3 terminals & short the 2 on the slosh unit, Did that and it dropped to 1/4 tank. Still covering the 3, un shorted, read just under 1/2.
Key on/run Over full (pegged?), Key off, ~1/8 under full.
Last edited by 08hybridok; 08-08-2014 at 04:23 PM.