And it’s kinda hard for me to see what is going without a drink in my hand looking at your problem.. you asked for suggestions, that’s what I gave you. You have a unit that is a minimum of 15 years old and at that age I gave you the basic suggestions. Other things that could cause this is bad injectors, air leak in the delivery system when it gets hot, bad fuel cap, filters installed backwards and as you said bad pump. When troubleshooting these units you need an assistant and knowledge of how the unit works. You said the tank is clean, how did you check? Have seen debris lodge in ares you can’t see, and if I suspect this is the cause I drain the tank, remove and flush. Are the fuel lines spongy? We’re they ever changed? Is the pickup tube cracked? Maybe it’s time to talk to your dealer? We can only make long distance suggestions, you’ll have to decide how to proceed.