Missing Gas Fill Line

So the RV is missing a gas fill line.

Took it to the fill station and blew a gallon of gas out into thin air.

The fill connection has no line connected to the back of the fitting.

What I took to be a propane gas grill hook up in that compartment is actually the disconnected fill line.

So.. hook it up and then put in a few gallons and see if it holds..???
 lets see what internet research yields...

Firstly the tanks in RVs are permanent installations and do not need periodic inspection, they are ASME rated.  (the small portable tanks are DOT rated and need to be recertified after 12 years and then every 5 years)

Ok.. so I hooked it up as is and it worked kind of.. yes fluid was transfered BUT.. also fluid was "lost"..

On inspection this hose was some sort of "non crimped" compression fitting ends to flare ends.

so basically you cut the braided steel reinforced hose to the correct length and then screwed on the "collar" and the "tapered compression" insert and then assembled those tightly together. That made your hose which is then used on the 1/2in flare gas fittings.

When I cut off the ends and reassembled and cranked everything down "tight" was able to fill with no leaks...

and low and behold.. no leaks or smell

I still need to buy a manometer and do the proper tests but for the moment this is OK.

Pictures to follow...