‘63 Sovereign

[Laflerd]

I have my grandparents ‘63 Sovereign. The Airstream has been in storage since 1978. I have very little expertise. What do I need to do to get the plumbing going. Yes I realize everything should be converted to plex. But what if I want to just see where I’m at as is?

I know the water heater doesn’t work. There’s no instruction manual. I know it has some sort of air pressure system. I think there is an electric water pump under the kitchen sink? I know where the hose connects for incoming water. I know where the black tank drains. I know I’m going to need a blue boy for gray water.

I’m not doing a complete restoration. It’s in good condition and no floor rot. I’m willing to upgrade plumbing as necessary. Am I going about this the wrong way? Probably.

I need to know what steps to take in order to test the plumbing.

[HiHoAgRV]

If it has the original oven, heads up that the pilot light is "on" anytime the gas is on. There is a valve under the stove top that shuts off the gas. Unfortunately if you want to use the stovetop, the oven pilot will be on also. It's a 'one year only' unit. I wouldn't call it collectible but might me desirable if you want it to stay original.
Early trailers used a pressurized tank to hold water. An air pump built up pressure or the fill cap may have a hose connection that fills and pressurized at the same time.
If it was stored without water in the pipes (highly unlikely) you might be able to hook up a hose and see what happens. Have someone standing by to turn off the water, it's probably going to leak from busted pipes.