Air in lines when using water pump.
Need some suggestions. I have a 2009 M-210 and my proplem is when im using the water pump, it wont pressurize the lines and runs continuously (water sputters out, lots of air......an this is with the tank full). I upgraded the pump in hopes of fixing, no luck, same issue. No signs of any leaks, when I hook up to external water (pump off) everything works fine. Does it with hot or cold spigot.
Not sure where to start...nothing seems obvious.