2001 Oldsmobile Bravada Hard starting

After sitting for awhile, my 2001 Bravada takes a long time to start (10-15 seconds of cranking time). I get in, turn the key, engine cranks and cranks and cranks before starting. If the car is warm, and has only been shut off for a few minutes, it will start right up. No check engine light, no fuel leak, and when it's running it drives normally, no sputtering hesitation or stalling. I suspect the fuel pump is going bad, as this is common, but should I be looking for something else?