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Re: Fuel Gauge Bias
Posted by Jeff Sutherland (more from Jeff Sutherland) on Mon, 27 Aug 2001 23:28:53
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

> On my 91 900, the fuel gauge seems to be biased downward, so that the
> needle never really points to the F after I fill the tank, and gets to E
> (without the warning light being lit) with 4 or more gallons left in the
> tank (I rarely add more than 12 or 13 gallons, and IIRC the capacity is
> around 18).  Fortunately, my trip odo still works, and I reset it each
> time I fill up (before starting to move), so I have a pretty good idea
> of when fuel really is needed.

Sounds awfully familiar :)  Just went through this on my '88 9000 and yes, 
the fix is relatively trivial.  Step one is removing the plywood floor in 
back to gain access to the top of the sending unit.  (Never did my 900's yet 
but on the 9K there's a little cover plate with 2 fancy fasteners you have to 
open to gain access to the top of the fuel tank once the floor is out).  Pop 
the connector off, clean the contacts up, and replace it.  That should fix 
the 'bias' problem.  Throughout the rest of this car they've used pretty 
decent connectors, yet on something as critical as the fuel sending unit, 
exposed to the outside elements, they used a brain damaged little non-sealed 
connector >:(

While you're at it why not unscrew the locking ring for the sending unit, 
pull it out, and take it apart and clean the gunk out of the bottom?  Just 
unscrew the little nut on the bottom of the sending unit and the whole thing 
comes apart quite nicely.  Take care not to damage the fragile resistance 
wires inside, though.

BTW I heard rumors that on the NG900's the fuel tank has to come out to do 
this :(
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