Check the RV's circuit breaker and make sure it hasn't been thrown. If the breaker is thrown every time you try to start the Shurflo pump, there's a short circuit or a break in the electrical lines somewhere. The pump should not be started until the source of this has been located by a licensed technician. If the circuit breaker hasn't been thrown, feel the pump's casing. It might be warm, in which case the built-in thermal breaker will keep the pump from starting until it's cooled down. If the pump is cool, feel the water lines going into the pump. If they're cold, the diaphragm assembly connected to the water inlet line may be frozen. It should be unbolted and allowed to thaw before continuing. If none of these steps help, the pump's drive assembly may have seized. This can only be repaired by a professional.
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Pump Won't Stop
A Shurflo RV pump won't stop pumping water when it senses that a faucet or tap has been left on. It can tell this by the pressure imbalance between the pump's output and input lines. If the pressure in the output lines is lower, it will continue to run. The pump will run non-stop if the output lines to the RV's fixtures are leaking, or if there is an air pocket caught in these lines. Repair any leaks and open all the taps for a few minutes, until the air pocket has been released. The pump should stop. If it does not, then the shutoff pressure switch that governs how much water pressure the pump must generate before it's allowed to turn off is improperly set. Adjust the pressure switch to a lower setting.
Pump Vibrates and Makes Noise When Operating
Check all the plumbing lines to make sure that none of them have become loose and begun to vibrate while the pump runs. Look at the surface upon which the pump sits. Does it transfer noise easily, like with sheet metal, or is it more solid? If it's a thin material, consider adding a heavier mounting block to sit the pump on. Look at the feet mountings on the pump as well. Are they loose? Tighten them. Check the pump head connecting to the drive assembly and make sure it's firmly bolted in place, as it can rattle around otherwise. Should none of these fix the problem, it's possible that there's a problem with the drive assembly which should be looked at by a professional.
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