A completely dry pump may not be able to prime itself. You can try this: unscrew the inlet hose at the far end, tilt it up, pour water into it and into the filter. That may be all it needs to get pumping.
My system airlocks sometimes when towing with a partial fresh tank, I just let the air bleed out the faucets, or turn the supply valves so the flow runs straight back the return (tank fill) line into the tank for 20 seconds. That bleeds the air pretty well.
John Davies
Spokane WA
Thanks, John, for saving my ass again. Simply setting the Prestone on the bumper was enough for the pump to self-prime. I'd had thought my engineering degree would be helpful for more than calculating heavy lifts and overhauling turbine generators, but sometimes forget the basics.
Cannot pump water from fresh tank
in Mechanical & Technical Tips
Posted
Thanks, John, for saving my ass again. Simply setting the Prestone on the bumper was enough for the pump to self-prime. I'd had thought my engineering degree would be helpful for more than calculating heavy lifts and overhauling turbine generators, but sometimes forget the basics.