I have a 97 Pontiac Firebird Formula. Overall it runs very well, however, when the outside temperature exceeds 90 degrees, my fuel pump starts humming after an hour or so of driving. It never makes a sound during cooler temperature days with the equal amount of drive time.

My question to anyone that can help is: Should I just go ahead and replace the fuel pump, or is there something else I should be addressing?

Help will be greatly appreciated.

Welcome to the forum. Have you changed the fuel filter lately? It may not have anything to do with your problem, but it is a good idea to do.

Yep, I changed the fuel filter. In fact, I change that thing when ever I change the oil. May be a little overkill.

I would start with checking the wires, check the ground points. make sure everything is clean and tight. But if the pump is making noise it'* generally time to replace it. But checking the wires is free. A bad ground could cause high resistance and that could cause problems.

Thanks for the help, just purchased a new pump, going to install it in the morning.

Welcome to the forum, Hawaii50! Let us know how your fuel pump install goes.

I moved your thread into the Mechanical & Maintenance section so that it gets more eyes on it.

And lots of pictures don't hurt either.