the other day I put gas in my '92 and it took a while to get it to start afterwards. I can still hear my fuel pump when I turn the switch on but it sounds different. Once the truck starts it runs fine and I haven't had any problems. Anyone have any ideas on what the issue could be?

 

you might check voltages as close to the pump as you can...bad ground?? Fuel filter been changed?

 

I'm just guessing here but...possibly the check valve in the pump is going, lost fuel pressure and took a little longer to crank to start?

 

I've now discovered that this issue with taking a while to start is only when the truck is up to temp. What could be causing this?

 

Sometimes a cold pump works better than a hot one.
Or your injectors or pressure regulator could be bleeding fuel into the engine and flooding it after you shut it off.
Those things could be figured out if you had a fuel pressure gauge (tester).
It also may not be fuel related at all - but that's the place to start.
Actually, pulling the codes is the place to start.

 

If you ran low on gas, it was because your pump got to hot. The gas acts as a coolant around your pump. If change that fuel filter to so it's pushed easier.