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I have a 99 camaro ss and a few months ago, ( with a half tank of gas) my fuel gauge dropped to empty while i was idleing at a light. Ever since then my gauge has never worked properly. When I fill it up full of gas the gauge works fine but once I get down to a 1/4 tank it doesnt work. The needle usually rests on empty. Even with a half tank it sometimes falls to empty. Is this a sign my pump is ready to go?

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It seems that all late model GM sending units are notorious for things like this. The fuel gauge going wonky shouldn't point to a pump going bad. When the pump goes bad, don't worry....you'll know it. It'll probably work fine one day and then the car will just start shutting off.

You can try finding the connectors for the fuel sending unit at the tank, then try to clean them and put some dielectric grease inside. There have been countless numbers of them replaced so you might be better off just resetting your trip meter with every fill up and watching it.
 

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if you pulled the sending unit out of your car and looked at it you would know why GM has had thousands of sending unit failures. they are a peice of junk.the float assembly rides on a peice of plastic and when the plastic wears out the collector moves away from the rheostat and there goes your reading. it can be intermitent or not work at all.chevy shops are getting rich on this one by selling new fuel pumps and senders as 1 unit. about a $600 job. i replaced the sender in my 2000 silverado for $25 but it is a pain in the a** to tear the tank out. mine went bad with 50K miles. more poor GM engineering and not willing to recall them and make them right.
 
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