Question about Watts Onan Portable Generator - 4000 , Model# 5500

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My Power Pro model 5500 runs fine, but gasoline leaks from the fuel filter. Any Ideas?

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  • gfgordon Jul 28, 2010

    The email response to me stated: "A new solution has been posted for your Watts Onan Portable Generator - 4000 , Model# 5500 Problem on" However, I assume the answer for Watts Onan whoud be the same for Power Pro.



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You most likely either have a crack in the filter or your fuel line has started to harden and is no longer sealing. The best solution is to replace both the filter, lines and be sure to replace the clamps if they are the spring type.

Posted on Jul 28, 2010


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Sounds like dirt or varnish in the carb. You will have to take the carb apart and use some carb cleaner. Spray it in and be sure to wipe it down. This most probably happened because you stored the gasoline in the generator tank without adding a good gasoline staybilizer if your going to store it for a long period of time. I usually flush out all of the gasoline whenever I finish using mine. Here is a tip.. Once you finish using your generator then drain out the gasoline then keep trying to start it up again. Once it starts just let it run out of fuel. This gets everything out of the lines and the carb.

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