When putting our Roadtrek back into service afer blowing out the water lines with air for winter, sometimes the pump won't prime. I hook up the city water connection and flow water to all faucets and the toilet to remove air. Then disconnect city water, start the pump and flow water to each faucet and toilet. This works for me.Hi just took my Rialta out of storage and pump doesn't want to pump for some reason. Wondering if anyone would know an easy way to prime pump or if maybe a valve position could be the problem. Thanks in advance.