Remove the float from the Regal. inspect the float for leaks, then check the spring and needle valve as it could be stuck. If all parts are ok then the parts need cleaning as they are sticking.
How do you replace the fuel filter on a 2003 Buick Regal?
The 2012 Buick Regal runs on flex-fuel (FFV).
The 2002 Buick Regal runs on regular unleaded.
The 2003 Buick Regal runs on regular unleaded.
The 2011 Buick Regal runs on regular unleaded.
The 2004 Buick Regal runs on regular unleaded.
The 2001 Buick Regal runs on regular unleaded.
The 2013 Buick Regal runs on regular unleaded.
The 2014 Buick Regal runs on premium unleaded (recommended).
Wandering fuel gauge on a 2003 regal
In the fuel tank.
In the fuel tank.