My mom has a 2003 Bonneville and is having many of the issues listed on this site. The issue today is the fuel gague is intermittent and generally sporadic. The question I have is the car has 100K miles on it and should I replace just the level sensor or the complete fuel pump module. I have a GM car as well (Olds Alero) and had to replace the fuel pump at 110K. I am afraid that if a just replace the sensor, I will be cracking the tank open again to replace the pump in the near future. The cheapest I have found the sensor is $75 and I can ge the OEM pump module (including sensor) for $250. Any thoughts?
Might not be a bad idea to replace the whole pump if it'* getting that old. Replacing the pump in that car isn't all that hard. There'* a access door in the trunk, so you don't even have to lower the fuel tank.
Many of us have replaced fuel pumps, but at what point, I can't say for sure. You can do a fuel pressure test, if you have 48-55 with KOEO then the pump is fine. If it'* lower then that, then the pump is getting tired.