2 smells in Bambi need help
Ok, here are a few questions. I have an '03 19' Bambi. When I open the propane cover, there is a very faint scent of propane (technically, it is the stuff they add to make propane smell). Anyway, I've inspected all of the fittings, as best I can, using soapy water and looking for bubbles. I cannot find a leak. My guess is that the odorant added to the propane gets on the lines, fittings and elsewhere and can result in a faint smell, even if there is not a leak in the system. Is this possible?
My second smell is this: last year, I ran over an object and wiped out the plumbing under Bambi at the dump valves. I replaced the tubing as needed and, since the black tank was badly cracked, I replaced that also. I began to notice that there was a urine smell in the rear of the trailer, which seemed to be strongest in the gap between the bathroom wall and the bed. When the Fantastic Fan was on, with the air being exhausted from the fan to the outside, the smell seemed to be worse. It occured to me that the insulation under the trailer might have been soaked during the accident, so I had that replaced. The insulation had a slight smell and replacing it seemed to help. I still have a smell, mostly noticeable if the rig has been shut up or (and especially) if the fan is on and exhausting air, but only minimal/rarely, with air coming in from the fan. There is also an odd, although not exactly the same smell under/near the sink.
I wonder if black water has gotten into the grey tank (if one dumps the grey, leaves the valve open, then dumps the black, it would seem likely that black would get pushed up into the grey tank) and this is being vented into the trailer via the trap vents under the sink and under the bed. When the fan exhausts air, it would create a negative pressure in the trailer and pull vented gas in, would it not? Are these only one way valves in the vents? If so, is there a way to test if they are working properly?
My plan is to put laundry detergent into both tanks, add some water, drive around, then possibly do the same thing using bleach. Then I'll add some Odorlos, or other anti-smell stuff, if need be, to both tanks. I'm also trying to make sure that water stays in the shower and sink traps. Any other ideas??? Thanks, rd