RoadTrek Water Pump

[herbrick]

Right in the middle of a fairly long road trip and have run in to a problem with the waterpump. I have a 95 Roadtrek 190 versatile.
When the switch is put on for the pump it runs for a split second every five seconds. I left it on yesterday for two hours and cannot find water leaking anywhere so am stumped as to why the pump seems to keep priming itself. Any thoughts and ideas much appreciated
Rick

[markopolo]

Here are some SHURflo trouble shooting tips.

PUMP WILL NOT SHUT-OFF / RUNS WHEN FAUCET IS CLOSED
Check:
* Output side (pressure) plumbing for leaks, and inspect for leaky valves or toilet.
* For air trapped in outlet side (water heater) or pump head.
* For correct voltage to pump (±10%).
* For loose drive assembly or pump head screws.
* Are the valves held open by debris or is the rubber swollen?
* Pressure switch operation.

also check:

LEAKS FROM PUMP HEAD OR SWITCH:
* For loose screws at switch or pump head.
* Switch diaphragm ruptured or pinched.
* For punctured diaphragm if water is present in the drive assembly.

A very slow leak at the toilet could easily go unnoticed.

[herbrick]

We have been dry camping for a few days so last night was the first time I hooked up to city water since the problem began. Woke up this morning to a large puddle under the passenger side filler for the water tank. There are two valves near the city water hookup. One is a drain and the other allows the tank to be filled. The one for the tank is not closing fully so when the pump is running it was losing pressure as water was going backwards in to the tank reservoir. So now just need to find a new valve and problem should be solved. Thanks for the other tips and I will print them out and keep them with my paperwork just in case.