my pump is a 3.7 GPM shur flo waterwolf. I don’t think it’s the pump.  I got alot of bends in my pipes, I’m trying to figure out how to eliminate one main bend that goes from my tank down to the floor to the pump. my fresh water tank sits on top of my waste tank. I might have to pull apart my base and widen it by 2 inches to put them side by side.  I’m hoping that’s not the case, but I’m gonna wait and see what reply’s and advice I get.

I looked up the specs on that pump and it shows a max. output pressure of 12 psi. Not enough to operate the pressure switch on your heater and keep it running.