fuel system lift pump supply pump

What up fellas I got a 99 24v recently and the guy before me has this Oasis lift Pump on it. I’m looking to change the filters on it but I can’t find any information on the company/pump anywhere. The guys before me who had the truck for 30kish miles said he had never touched it, so it must’ve...

Hopefully someone can help me with this 99 VP44 6speed 4wd, every once and a while when I go to start it everything on the dash lights up as normal but I won’t hear the lift pump kick on and the truck won’t crank like the batteries are dead, then if I take the key out wait a minute or two...