I have been having the problem reported in another post recently about a ProXS losing prime and dying while idling for more than a few minutes. I took Don's advice and an going to replace all of the fuel system components from the tank to the motor including the pulse fuel pump and fuel filter. I have all of the components except for the fuel demand valve. I need an Atwood Integrated Fuel Demand Valve part number 99IFDV00-1. Anyone know where I might find one? Don, is this a part you stock or can order for me? If I can't find it can you recommend a suitable alternative? Also, do you feel it is absolutely necessary for me to replace this? This is on a Ranger Z520, 250 ProXS SN B966102.