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Your replacement fuel pump assembly float got stuck somehow rendering it useless. also make sure the electrical harness was connected properly on the replacement. I take it for granted that the replacement was new? Perform a bend test on your replacement fuel pump assembly with an ohm meter. Move the float and see if the ohm meter resistance changes.
If your gauge is pinned in one direction or the other and doesn't move, you could have a short. If it's in different postions or just incorrect, it's is your pump. If you do not have a new fuel pump that is AC Delco, Delphi, or Denso brand, it probably IS your pump. #1 problem with guage accuracy is this fuel pump/sending unit. Aftermarkets do not last long at ALL. It is very common for most other brands to last less than a year.
the "sensor" is actually just a long arm with a "floaty? on the end and gauges where in the tank the top of the fuel is located therefore giving you a read out on your dash. the sensor your talking about sounds like the low level readout sensor.this is located elsewhere and is simply asensor that reads the information of of the fuel pump and vocalizes low fuel warning. if you knowingly have fuel in your vehicle then your sensor may be shorting or or your dash gause has a short.
Fairly common problem with GM vehicles. The sending unit in your tank has a small circuit board that an arm is attached to which moves up and down according to your fuel level. This circuit board and arm are not making good contact. Unfortunately the only good solution is to replace this part.
Is......the problem--"the gas gage reads empty when there is fuel in the tank. OR, The gage moves when the key to turned off ?
If it's the first,
You will need to test the gage and through process of elimination, determin if the Sending unit inside the fuel tank has gone Bad.
If its the second ? - Electrical gauges will move when powered down. Normal
Testing the gauge may not be easy - just depends on your ability.
It is a simple 2-wire gauge circuit, when disconnect (usually need the fuel tank) the gage reads in one direction (either full or empty)
then when shorted-the gage reads in oppisite direction.
Of course you must select the correct wires or you may short out the wrong circuits!! Most GM vehicles use a purple wire & black wire.
A quick method I have used to check the in-take part of the gauge is this.
1st. know there is gas - 1/2 tank works best.
2nd driver's door open, key in run position, engine not running.
3rd gently lift up on the door then let if come back down, gently.
just enough to cause the gas to slosh around.
4th - keep an eye on the gas gage, a bad sending unit in the take will show up as a "twitchy" needle.
Of course, if the gage never leaves empty - sloshing won't work.
I have a known good sending unit I can plug into the vehicle and simulate different levels of fuel - if the gas gage works, I know the problem is in the tank.
Unfortunately this is most likely the fuel pump module, which includes the fuel level sensor also. This should be diagnosed more thoroughly with a scanner, a good scanner will be able to check instrument cluster separately to confirm the gage is working right,and check for trouble codes that may not light any warning lamps. Hope this helps. Rate me please.P.S. Dont use that fuel station any more.