924Board.org

[Anhaedra]

I've read about the gauge being stuck on empty or half, but never full. My suspicion is the fuel sending unit, if the sending unit goes bad, can it leave the gauge stuck on full?

[924turbo_sout_africa]

I cant remember who but there was a whole thing on the board to clean the unit inside the tank i'm sure your's might have the same problem ,i had the sender unit giving problems and well cleaned it out and it works but ,as i say i lost the tread that had it step by step and with pic's i'm sure smoothie can help
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Porsche ...where dreams are a reality
'79 924 turbo canada spec
'98 Formula Vee (M3 eater)

Time in the 931 is a dream come true !!

[924RACR]

Yes, I posted one with pics, actually a full article. It's in the 924.org Tech Section:
http://www.924.org/techsection/gas_sender.htm

Sometimes that works, but the last one I had apart was irreparable, badly corroded, had to replace it.

There is a float inside the sender, sounds like it's stuck at the top, unless there's an electrical malfunction.
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

[Vince Ponz]

Take out the unit make sure you disconnect the battery first.

DO NOT attempt to clean the wires. On the bottom is a littler fiber nut so unscrew the unit and soak it in cleaner. Do not turn it upside down.

The wires are thin as in hair. Thin. Try to clean them and you will be buying a new unit.
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"Never let them see you sweat"
77.5 924 modified track car
79 931 Euro stock
88 924S SE
87 911 Targa stock

[Mike924]

Hmmm - before you rip the sender out, check for electrical shorts.

Remove the wire from the 'G' terminal on the sender. Turn on the ignition, check the meter reading. It should be hard over at one end (the empty end, I think). Then temporarily connect the same wire to ground, the meter should swing hard over to the other end.

If you don't get this this behaviour, it's likely not the sender at fault. Start looking for wiring faults/shorts at the meter end. If the meter does behave as above go ahead and remove the sender.

Also it's worth checking the 'G' and 'SW' wire haven't been switched.
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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org

[Benino]

I don't think there is anything wrong. You are just getting 100mpg and your tank is actually still full.
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1980 Porsche 924 N/A USA
1980 Porsche 924 turbo USA
1987 Porsche 944S USA

[Mike924]

Maybe Anhaedra's driveway is above an oil well and fuel leaks up every night into his tank!
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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd

'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org