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dvallis's Avatar
 
Join Date: Jan 2011
Posts: 26
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So what's up with my gas gauge?

When my gauge reads near empty (< 1/8 tank) the car will only take 12 gallons of fuel for a fill up. According to the manual we have a 20 gallon tank. Can the gauge really be 8 gallons off? Is this a "they all do that" issue, or do I need a new fuel sender?

It seems to function normally otherwise. Does't stick, fills to the top etc. It does seem very non linear.
Old 06-15-2011, 06:27 PM
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sudo apt-get purge 930
 
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Quote:
Originally Posted by dvallis View Post
When my gauge reads near empty (< 1/8 tank) the car will only take 12 gallons of fuel for a fill up. According to the manual we have a 20 gallon tank. Can the gauge really be 8 gallons off? Is this a "they all do that" issue, or do I need a new fuel sender?

It seems to function normally otherwise. Does't stick, fills to the top etc. It does seem very non linear.
Exactly the same for me!
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL***

"Worrying about depreciation on your car and keeping mileage down is like not ****ing your girlfriend so her next boyfriend finds her more appealing"
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Old 06-15-2011, 06:57 PM
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Read a couple of threads on repairing the sender, its not too bad. I had different symptoms, but pulled it out and fixed it.
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1979 SC, Slant nose wide-body cab conversion. AEM Infinity EFI. Whipple Supercharged!
Old 06-15-2011, 07:16 PM
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it's easy to change out
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88 turbo Guards red Targa slant nose, and yes I am a horsepower junkie, 3.4liter,7.5 to 1 JE pistons, Adjustable WUR, Imagine fuel head, 1 bar waste gate headers,allthe cis toys. Now apart to become the next EFI monster. fabbing my own intake, headers Individual throttle bodies, MS-3, pauter rods, Xtreme twin plugged heads, gt-2 evo cams cop's.
05 Cayenne S lapis blue
Old 06-16-2011, 08:56 AM
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Replaced the sender. Same gas gauge behavior. Damn

On the bright side, I now know exactly how far my car will go on a tank of gas. Ran it down to 1/8 full, put a 2 gallon can in the trunk and drove until it ran out of fuel. Check out these weird numbers.

161 miles - gas gauge reads empty
234 miles - low fuel light comes on (had never seen it before)
291 mies - out of gas

The car actually took 23 gallons on the fill up. (including fuel from my spare can) That makes 12.6 MPG in town. Pretty good, considering I am always on boost. It was only 7 MPG before the rebuild, so I'm pleased (Thanks again Dave M) I fill up at 250 miles now.

Time to look for a new gas gauge.
Old 07-13-2011, 08:48 PM
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My gauge was stuck in 1/4 full so I ran out of fuel on sunday. Took a bit of effort to figure what had happened until I relised it was empty. I've had so much trouble with misfires with melting rotors and so on it did not seem like it was out of fuel.

I got bad misfires after the episode but now that I finally assembled my MSD superconductors (universal V8 kit) the car runs really nice and I have two spare wires too.
Old 07-13-2011, 11:05 PM
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