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  #1  
Old 10-30-2007, 10:23 PM
unkl300d's Avatar
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C280 1995- gas gauge-how do it work?

Hello,

Does the gas tank have a float or is it an electronic metering device that sends a signal to the gas gauge?

My gas gauge lately has periodically signalled empty having a full tank.
I shut off motor, open gas cap, let out pressure, replace cap.
Upon start up and there on, the needle registers correctly again.

Does the gas tank have a screen that may be gunked up?

(any easy way to blow air into it to clean up or how to remove screen??

Thanks for any information.


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  #2  
Old 10-30-2007, 10:59 PM
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You might want to buy a new gas cap. I think they are supposed to be vented and when they get old or bad they don't vent. That is why some cars fail Emissions tests. because of a bad gas cap. Just a thought.
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  #3  
Old 10-31-2007, 01:45 PM
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Thx.

Is the gas cap supposed to be vented? Anybody confirm?
Other factoids?
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1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
********************
1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD
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  #4  
Old 10-31-2007, 02:23 PM
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No vent on any gas cap after 1974 in the USA. System has charcoal cannister to vent the tank system.

The fuel guage is part of the instrument cluster (computer).

There are 2 sending units in the tank, connected in series. The guage averages those readings.
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  #5  
Old 10-31-2007, 09:19 PM
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Thank you MBDOC.
__________________
1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
********************
1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD
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  #6  
Old 11-01-2007, 07:58 PM
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On my C280, if I really fill 'er up, the gauge will read low, then as gas is used, the needle moves back toward full.

Are filling it up too high?
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  #7  
Old 11-01-2007, 09:48 PM
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It is not being topped off max as far as I am aware of.
However, the real reading was at 3/4 full when the jumpy needle toward empty occurred three times.

Thanks for your anecdote.

__________________
1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
********************
1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD
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