Bob Davis, reply to gas gauge question of 2yrs ago. - Saab 9000 Bulletin Board - Saabnet.com
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Bob Davis, reply to gas gauge question of 2yrs ago.
Posted by EricG (more from EricG) on Fri, 13 Feb 2004 14:34:21
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Bob,
Don't know if you're still reading this board, but you asked a question a few years ago that has floated in the back of my mind since. You were using the trip computer to watch a low gas tank by monitoring 'miles to empty'. As I recall you were merrily pinching along with around 60 miles left, and it suddenly dropped to 10 miles or some such. This put you in a whole lot tighter spot that you thought you were in. (Those gators gonna get you!) You wondered how in heck there could be such a change!?!
I replaced my fuel pump on my '95Aero last fall, and your question just came back to me. I'm guessing you may have learned the answer by now, but here is my speculation.
The fuel sender consists of a float on one end, and the other end making contact on a series of 20 or so contact points. As the fuel goes up or down, it appears that the lever end of the float passes over these contacts to indicate fuel level.
So my speculation is that the lever jumped from one contact point to the next, indicating a really minor change in level, except that you needed that extra 20miles or so to get to new gas. I've never watched that miles left indicator to see if it tends to jump in 20mi or so increments. I would expect it to if my theory is right.
Bet you forgot you asked that question....
posted by 159.116.2...
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