Lets start with the easy stuff.
1 Did you let the pump run long enough with the farthest faucet open till it bled the air out. It will spit and sputter till all the air is out
2 Is the hot water heater full of water if you have one.
If that's not the problem
3 Check the water line and fittings from the tank to the pump for leaks (sucking air)
4 Could the pump have frozen and cracked?
5 This is a long shot is the pump power and ground reversed
I'm sure other people will be along with other ideas.
96 24' Hi-Lo Funchaser, (99 Aliner Sofabed Sold 6/9/18)
06 Toyota Tundra Access Cab 4X4 35000 miles and counting