Originally Posted by youroo
Don1,your placement of a suction side manual check valve will do nothing to protect your Pump,that has been replaced 3 times! Your water system has other Issues that need to be corrected when your on City water. Your proposed setup when using Tank water will mean turning the suction valve on/off every time you want to use your Pump that has a Bad check valve!
youroo -- the way I see it, the shurflo pump has a one way ck-vlv such that when city water is connected, the cw pressure "should" keep the valve closed for the other side of the valve, which is the suction line from the fresh water tank -- if that valve sticks open, no matter the cause, be it grit, sand, stone impurities, city water has a direct path to the fresh water tank and the tank will fill in short order --
you say that my "water system has other Issues that need to be corrected when your on City water." -- might be, but such as?
pump lines run to where they should; t's provide the required directional flow throughout the camper: seems plumbing is okay; the only common item shared by both FW and city systems is the pump --
"Your proposed setup when using Tank water will mean turning the suction valve on/off every time you want to use your Pump that has a Bad check valve!" -- this I find is a rather simple matter when compared to determining how to drain a 30 gallon tank onto a fine pad in a fine rv park without park personnel noticing since the draining of tanks in parks is usually frowned upon -- the valve could be a spring-loaded type, or a manual type, but would not find it bothersome to manually turn it on/off, for the pump location is quite accessible, just inside the basement door