My pump is 5 days old worked great and then quit won't come on

I was told that some fuel pumps do not work more than a day or two, replace the fuel pump again. Mine came with a warrenty

I think you had the same problem that my aunt had with her Cavalier. The fuel pump
failed. Grandfather installed an aftermarket fuel pump and it worked fine. I hope this
is the solution. (As a side note, I think you were losing prime through the pump).

I would say your ignition coil is bad. They get hot and quit working until they cool off then work again.

Good day,
That's a no-no. Your compressor carries a 5 year warranty from the factory. However, if anything is altered on it the warranty is voided. You've got an issue with this guy.

You don't say how old the truck is - or how old the pump is - most likely it is the pump 'dying' as you try it -

I would look near the tank and find the ground wire -[ it may be on top of the tank] - the most common fix is the fuel pump and sadly it sounds like this is it --

Also - Take down the Vin # and call the local dealer - - ask about recalls and Service bulletins.

There is an o-ring inside that is probably bad. I tore my pump apart and found it and repaired it. My sprayer was about two years old as well.

Replace the crankshaft position sensor

sounds like your fuel pump is going out. One thought might be that the fuel filter is causing enough resistance to over heat the pump. I would check the fule pressure to determine a free flow of fuel.

Did you run out of oil?