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My 1982 GMC Chevy Lazy Dase motorhome failed the EVAP test during a smog check pre-test.

How does one fix it? Do I have to take the fuel tank out to fix? It has one gas tank and is a GMC Chevy truck engine and fuel tank type. They said I scored a 46 and max is 40. Will filling the tank higher than under 1/4 full make any difference? I do not have a generator. Does the fuel tank have to come off to fix it?
Answer:

You don't necessarily have to remove the gas tank from your motor home. Your Lazy Daze failed the LPFET (Low Pressure Fuel Evaporative Test), and consequently the smog check, because the EVAP system was unable to hold proper pressure; but where the leak is from needs to be determined. It may be from the fuel tank and it may not. We recommend inspecting all hoses and vacuum lines leading to the fuel tank, charcoal canister and between these components and the engine, for leaks. Check for brittle, dry or cracked hoses. Pay close attention near fittings with clamps. Over time clamps dig into the rubber hoses severing them. With close inspect finding your Lazy Daze Motorhome's EVAP leak found not be hard. Once the leak is found the repair should be simply, and you'll be able to pass the smog test. Having the EVAP test conducted with more gas in the fuel tank will make no difference during the EVAP portion of the smog inspection. The EVAP machine pressurizes the fuel tank as needed with Nitrogen gas. The less fuel in the fuel tank the more nitrogen is added. posted by SmogTips Support

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