10-19-2015, 04:48 PM
Many of the 90s coaches have the old JetpaQ 110V water pumps(see picture). This water pump has a pressure diaphragm similar to a pressure tank in a well system. The pressure diaphragm is located within the stainless steel end. The manual calls for checking the pressure within the pressure diaphragm every 6 months.
Since I have never checked mine I thought I would. The pump is charged at the factory to 30psi. This would give the pump a discharge rate of 43 psi. A drop in pressure in the pressure diaphragm will drop your discharge pressure--for example dropping to 26psi, the discharge rate drops to 36 psi. There is a normal tire type schrader valve on the stainless end of the pump. Prior to checking the pressure shut off the pump and release all pressure by opening a faucet. I checked mine with a tire gauge and it was only 21.5 psi. I increased it to 30 psi. Remember this is a small pressure diaphragm so you will just need to put in a small amount of air.
Since I have never checked mine I thought I would. The pump is charged at the factory to 30psi. This would give the pump a discharge rate of 43 psi. A drop in pressure in the pressure diaphragm will drop your discharge pressure--for example dropping to 26psi, the discharge rate drops to 36 psi. There is a normal tire type schrader valve on the stainless end of the pump. Prior to checking the pressure shut off the pump and release all pressure by opening a faucet. I checked mine with a tire gauge and it was only 21.5 psi. I increased it to 30 psi. Remember this is a small pressure diaphragm so you will just need to put in a small amount of air.
Steve Bare
1999 Newell 2 slide #531