The fuel pump is located inside the fuel tank. Unmount the three hoses that comes out the fuel tank (be carefull the leaking fuel), take the tank down and unscrew the cap on top of it, the pump holds under it. This can be a hard job, be well prepared (hose fiting leaking afterwards, rusty nuts...)
Drop the fuel tank.
How do you replace the fuel filter on a 2003 Buick Regal?
The 2012 Buick Regal runs on flex-fuel (FFV).
The 2003 Buick Regal runs on regular unleaded.
The 2004 Buick Regal runs on regular unleaded.
The 2001 Buick Regal runs on regular unleaded.
The 2002 Buick Regal runs on regular unleaded.
The 2011 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.