I think that is a Marshall 290. And it seems like only Van Cafe has the correct one with the vent pointing downward which is a requirement.� They make a 290A or something that others sell and they call it a 290, but I just replaced mine and got the right one this time.� If you look at�RV catelogs the�ones with the "horizontal" vent from out perspective, say they are for verticle tanks, 
Whether�the horizontal vent helped damage it when it got ice and water on it, I don't know, but it was less than a year old.� I guess don't let them get slush all over them and freeze.� I didn't have the cover on it, but it wouldn't have helped with the vent facing the front wheel.
�
As far as testing, just get a gallon of propane in there and spray some 409 type stuff on every joint/seam.� It will bubble up with even the slightest leak.� Could be a connection which you can just tighten, or maybe the regulator.� You can drain the propane out in a safe�open area, I don't think it is a big deal. And I agree it is probably not the tank.

--- On Thu, 3/15/12, Jim Arnott <jrasite@EONI.COM> wrote:

Probably not the tank. Regulator leaks are fairly common. Replace with
a Marshall 260.

Jim

On Mar 15, 2012, at 2:28 PM, Spencer Allen wrote:

> I have a propane leak at some point in my 85 westy. Is there a way
> to fill with just compressed air to look for leak? It has the
> original tank and fittings. Thanks all.
> Spencer
> 85 Westy