STUPID FUEL GAUGE!

[kinjo1977]

So wtf is going on with my fuel gauge?
Is it possessed?

For instance, I was coming home last night. Now, I know I have a 1/4 of a tank. Yet when I get in it shows a FULL TANK! I'm like SWEET, but i know its not really full. So after driving a while, it slowly but surely falls back down to 1/4 of a tank. But that took like 20mins of driving to do that.
Another time, I was sitting in the parking lot at work listening to some music before my shift. So, I turn the A/C on cuz it was freakin 85degrees outside. So the radio is playing, A/C is running, and I look down and my Fuel Gauge is dancing to the music. So I'm like, WTF? Just jumping from empty to fuel and then hang out in the middle a little while. I watched this for about 5min and then cut it off and went inside for work.

So is it just a bad sensor? Or do I need to replace the whole gauge cluster.
Or is my fuel pressure surging and falling?
Also, this problem may be connected when I turn my A/C on. I have noticed that it does it more when I turn it on.

[RedHeartbeat]

LOL Kinjo, mine did that all the time. I watched my mileage per tank instead of trusting the guage. I figured I had a bad ground somewhere in the dash. My tach, speedo and all other gauges danced a little to the music too.

[Luke2kz71]

get a new sending unit for the fuel pump.... or depending on miles... just replace the fuel pump... thats what i did... was a pretty straight foward install.... here is a how-to from fullsizechevy if you dont really have a clue how:

my fuel guage was really screwed up, and changing out the pumps helped (mine came with a new sending unit)

http://www.fullsizechevy.com/fscu/fuelpump.shtml

if that doesnt solve your gas gauge prob... you could allways check it off the list and go from there

[GMCwantsLS1]

I've seen on those sending units the little brushes break off. Any time the fuel gauge reads open, it shows full. The only way I know to fix it is to replace the pump unit. The last on we bought came from O'Reily's, but you might find a better price somewhere else. Oh I have bought them off e-bay too, but you might get one someone replaced for that same reson.