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 Post subject: AC and gasoline odor
PostPosted: April 19th, 2016, 8:58 pm 
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GTC Owner
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Joined: May 10th, 2011, 8:46 am
Posts: 307
Hello all.... Last year I bought a reman York AC compressor and a new drier to see if I could get the AC workin again. For various reasons I put it off until a couple of weeks ago, but had a really good garage do the work. It's not an easy job. While it was at the shop I asked them to do a "smoke test" to see if I could find the source of the raw gasoline smell that overpowered us every time I put gas in the tank. This was a really aggrevating problem that had been there since I bought the thing 5 years ago and nobody was able to find it.

So. I now have freezing-ass cold air from the AC, and no more gas smell! We were unable to find any leaks by pressurising smoke into the fuel tank, but when I introduced smoke into the vapor cannister line connecting the carb float bowl and the cannister, a large volume of smoke appeared around the base of the carb. After close investigation, we discovered that there were not one, but TWO large holes on the underside of the steel vacuum line that draws gas vapor from the tank vent through the cannister. This problem was invisible from the top and never would have been found without the smoke machine. Not only is the gas smell gone, but now the vehicle performs better all the way around. I will need to mess with the idle mixture to take care of slow idle with the AC on now that there isn't a bunch of secret air messing up tghe fuel to air ratio. If any of you have had weird idle/carburetor/fuel odor probs, you now know where to look.


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 Post subject: Re: AC and gasoline odor
PostPosted: May 5th, 2016, 3:32 pm 
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GTC Owner, Site Admin
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Joined: May 7th, 2011, 11:43 pm
Posts: 416
Location: San Diego, CA
Good deal on fixing your problems. Mine still has all the dash A/C parts in it. I removed the compressor and condenser from my 1979 camper as it was a mess and it made it much easier to work on the engine.

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 Post subject: Re: AC and gasoline odor
PostPosted: May 6th, 2016, 10:47 am 
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GTC Owner
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Joined: May 10th, 2011, 8:46 am
Posts: 307
In the future I will wait a few days before bragging about how well a fix works. After engaging the AC the next day, I heard a loud, irregular knocking coming from the compressor, along with a subtle background tapitty-tap. Also there was a considerable amount of gurgle-gurgle-whoosh coming from the AC hoses. The nifty "rebuilt" compressor definitely had bottom-end problems and the system hadn't been completely vacuumed to eliminate air bubble and crud. I found a NOS compressor on ebay for $160. and took a chance. It turned out to be exactly what the seller claimed (for a change) so I had the shop change it out. He put the vacuum on it for 1/2 hour, which seems to have done the trick, as it now works great. If anyone is interested in it, I have the original compressor available and all it needs is (probably) just a kit and a rebuilt pulley.

I highly recommend inspecting your smog purge lines for holes in the metal tubing! The perforations were pretty large and appeared to be made by some kind of electrolysis, not rust. All I can figure is that a bare + conductor was touching the tube at some time, and the engine was the supplied the grounding source. Most RV's have a lot of non-factory wiring running here and there and the Hall is no exception.


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