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The SkiBumMobile failed it's smog test. Emissions are fine. It failed the EVAP air test. They replace your gas cap with an adapter that allows them to pressurize the gas tank, then they look for a pressure drop that would indicate an atmospheric leak. (after clamping off the line coming from the cannister). We had a huge leak. Fail. A shop would use a machine that injects some 'smoke' into the system, giving a visual indicator of the leak location. Since my locking gas cap also failed the smog test (They sell a LOT of gas caps at the smog station. Just get a new one as part of your pre-test inspection.) I tore the old one apart and used a few brass fittings from the 'old brass box' and and old blow gun to create a simple test adapter. Sure enough, I had a Huge air leak. Closer inspection showed gasoline stains next to the fuel pump plate. So it turned out to be Re-work from the fuel pump saga. My fuel pump failed the day before an expected 36" snow storm, as I was taking the SkiBumMobile over to the propane station at Kirkwood. It had been a fine week, and the storm track was still rolling. Now I was stuck in the dirt RV lot without enough propane to survive the coming storm. Time to bail. At $10.50 per mile for the tow truck, towing it home to fix it myself was not an option. A** covered the first $200, leaving me with a $300 tow to Gardnerville. Another $500 later, Bella and I are back at Kirkwood, making it through Carson Pass maybe an hour before they Closed the road because of the storm. I do love driving in the snow. Great tires. While checking out the situation before the shop opened that morning, I noticed a small gasoline seepage on the tank where the support angles were welded to the tank (Optional 26 gal. tank). Very small seepage, but definately there. OK for now, though. Back home, I give the tank a tight inspection and find a hairline crack next to one of the welds. Must have bounced it on a rock on that jeep trail..... So I pull the tank to take it to my welder. First have to get it boiled out at the local radiator shop, get rid of all the gas fumes. Vern repairs the crack, completes the welding around the angle bracket vs. the 1" stitch welds, and welds the other end for good measure. He tells me it passes all of the pressure tests, and after painting the tank, I re-install the tank. All is good. Till the smog test. I Assumed that when he did his pressure test he had sealed the top plates. Turned out he had tested it with dry gaskets. I did not check them. After a year and a half and another 15,000 miles or so, the dry gaskets just were not doing their job. Sometimes I feel so stupid. A little Perm-a-tex 2, a couple washers to covered wallowed holes (air leaked past the tightened bolt), and some new hoses on the filler spout (the old ones just looked nasty) gave me a system that is holding pressure just fine. Moral of the story: Anytime you work on your gas tank, you have to pressure test the system. Never crossed my mind to do that, I have never seen it in the shop manuals, etc. An example of a time where the Smog Test actually did me a service. I would not have looked for the gas tank leak otherwise.