98 F150 4.6 V8 intermittent fuel problem.
 

My truck will start up just fine the morning when it is cool. If I drive it around for about 30 minutes and shut off the engine the fuel pump will not turn on ( I can't hear the hum that I hear in the morning). Engine will crank over and has spark. I sprayed some starter fluid and the engine would run for a few seconds. I have changed the IAC and checked the fuel pump relay and fuse. Also the inertia switch on the passenger side panel is getting power and is not tripped. I have checked that the fuel pump is getting power and is grounded.
I am not getting any codes when I have tried to start it. I carry the testing with me all the time now.
I thought that if the fuel pump was the issue it would not start at all. When the truck is running it does great. No rough idle or misfires.
Any help is great. I've been trying to chase this thing down for a few weeks. Lucky I can carpool to work.

Change the fuel pump, it's starting to go out.

That's what I thought. But I was hoping it was something else a lttile easier to change.

That's what I thought. But I was hoping it was something else a lttile easier to change.

Changing the pump is a pretty big job to jump into without checking anything else first.

You can "borrow" a fuel pressure tester from Auto Zone or ....... and test the pressure.

You can push the button on the Schrader valve on the fuel rail to see if there is any pressure at all.

You can locate and feel the fuel pump relay to see if it is hot, or switch it with another relay when it has a no start.

All those things are much easier and cheaper than just jumping into the fuel pump. But it's your call.

But there is still a good chance that the pump is on the way out, it's just easier to check a few other things first.

I did check the fuel pump relay and switched it with another one, no luck.

If the pump is getting power,as stated in the first post, and still not coming on, I hate to say it, but I think you're looking at a fuel pump job.

Power into the relay is a good sign. Do you have switched power out of the relay?? If so i would check fuel pressure and air in the lines next. Could be a bad fuel hose.

Change the fuel pump last night about 5 hours. So far no problems. Still keeping my fingers crossed