Originally Posted by Toddupton
Put water in the tank and turn on the pump. The the pump build pressure and shut off. The pump should not come on unless a faucet is open. If the pump does come on start looking for leaks.
X2 - also this will allow you to test all the plumbing (don't forget the toilet
Make sure you test using the city water as well and not just your FWT.
Also don't skimp on your water pressure regulator - I have used this one for many years and love it - the fact that it is adjustable is really important IMO:
Here is another PDI trick: run several gallons of water into your gray & black tanks. Since it is a new RV, and this is "just water," the dealership should not have a problem with you "dumping" your black and gray tanks. Sewer test completed
Final suggestion: unless this dealer is local, I recommend you spend the first couple nights after you buy it at a campground really close to the dealership. You can PDI all you want, but actual living in the camper it the real litmus test!
Our dealership agrees with this and has even installed a 6 pad RV "camp" on their property just for this purpose.
Good luck and happy camping! (Photos and let us know how it goes are appreciated!)