inside the fuel tank
The 2007 GMC Sierra-1500 runs on regular unleaded.
no outside fuel filter. inside fuel tank part of pump assy.
I own a 1990 GMC Sierra 1500 5.7L V8. My fuel filter is located along the frame rail under the cab on the driver's side of the truck. You might look there for the filter on your 1989 Sierra. It's an inline silver colored canister.
drop the fuel tank. Bummer huh. :)
Behind the driver, inside the left frame beam.
In 2004 Chevy removed the fuel filter from inside of the frame rail and put it in the fuel tank.
The 1999 GMC 1500 PU equipped with the 5.0L V8 have an undercar in-line EFI filter. The filter is located directly upstream of the fuel tank in the gasoline line going to the engine. The OEM AC Delco replacement fuel filter is #GF652.
It is part of the fuel pump module in the tank.
its dirrectly under the driver side against the frame rail
The 2014 GMC Sierra-1500 runs on flex-fuel (FFV).
In 2005 Chevy started putting the fuel filter inside of the fuel tank. You will have to remove the fuel tank to service it.
Unfortunately it is built into the fuel pump which is located in the tank. Good luck