Hello and welcome!
If the fuel pump was an aftermarket pump it could very well be the fault. Given the history on these fuel pumps, it is not uncommon at all for a new one right out of the box to be defective, or even if it does work, a lot of times they don't work for long.
Couple of things you can test to determine if it is at fault. First check for power at the gray wire going into the fuel pump while someone is trying to start it. You can't just turn the key on and then check it because power drops off after 2 seconds if the engine is not turning. So you would need a helper for that. Next, if it does have power at that wire, install a fuel pressure gauge on the fuel rail test port (looks like a tire valve) and measure pressure when trying to start it, it HAS to have about 45 psi, and if it is much lower it wont be enough to open the injectors. If low, replace the pump with one from the dealer. If there is no power at the wire to the fuel pump, probably the relay.
If you have further questions feel free to reply.
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Yes, if it is an aftermarket pump i am not surprised that you have replaced it so many times. They are just sub standard and there is so much competition on the aftermarket that a lot of parts stores just buy the cheapest ones. Sure, they may warranty one if it fails soon enough, but they sure won't come out and put it in!!
Yes, the relays are kind of funny like that because the contacts can intermittently not make good contact sometimes, and sometimes they just fail completely. For the most part though, they usually do just quit working with no signs of anything...
As far as the regulator, if you remove the vacuum line to it and there is any signs of fuel in the vac hose, then replace it. Also below is the testing procedure.
Nice ride you have there, best wishes!
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They have it tucked forward of the driver side kick panel, on foot rest bracket, under the carpet. Below is a diagram that kind of shows the general area, but you will have to dig around under the carpet and you will find it. You can use the wiring colors to confirm you have found it.
Thank YOU for asking.
Best wishes my friend!