In the continuing saga of getting my '73 Holiday Rambler ready to camp, we've come across a problem. I have air leak in my fresh water system. I've got the old style compression pump. The pump cannot hold pressure because there is a leak at one of the fittings between the outside cap and the tank. Water does not leak, just air.
We took this fitting apart and found an O ring that appears to be pretty much worn out. We can't find a replacement O ring.
I'm not in a position to change out the pump right now. Does anyone have an Idea as to how I might try to seal up this fitting?
If the O-ring is really the problem, you can find ANY O-ring. The problem might be finding it locally. The home centers only have a very limited selection. Try an industrial supply house. Even a good bearing specialty shop will have a good selection. Worst case, they can take O-ring stock, cut to exact length, and glue into a ring. This how O-rings are made. Cutting the original allows you to measure the length precisely.
And if none of that works, you can sometimes make a worn O-ring work for a while by packing it heavily with grease and reassembling. I don't know the details of those old systems, but I'm pretty sure the air pressure will be fairly low.