Fuel Leaking from Nikki Carburetor Bowl


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Old 04-19-11, 09:51 AM
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Fuel Leaking from Nikki Carburetor Bowl

Some background: Generac 4000 EXL portable generator with Generac engine and Nikki carburetor. I always drain all the fuel from the gas tank and remove the carb bowl, dump the fuel from it and reinstall. Recently I needed to use the generator so I added fuel and fired it up. It started and ran without a hitch. But when I brought the generator back into the garage I noticed it was leaking fuel.

I traced the leak to the top of the fuel bowl, by the O-ring seal. I know fuel is not supposed to be up that high so I took the carb bowl off. The float is plastic and does not have any fuel in it. With the bowl off I blew into the fuel inlet while I raised and lowered the float. I could blow easily when the float was low and couldn't blow when I raised the float. Neverthless, I took the float and float valve apart. No crud, the float valve moves easily.

I'm wondering if the rubber-tipped float valve has dried out and doesn't completely seal anymore. Fuel doesn't gush out around the bowl, it's a fairly slow leak. The unit has stood empty of fuel for the last three years. Can I soak the rubber-tipped valve in something to soften/restore it? I hate to buy a rebuilt kit just for the float valve. Or is there something else I should pursue?

Thanks.
 
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Old 04-19-11, 08:08 PM
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I imagine that you can either clean the needle and seat, or clean the seat and replace the needle to fix this problem.
 
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Old 04-20-11, 05:52 AM
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Any suggestions for cleaning the rubber-tipped float valve? I believe I have some automotive aerosol throttle body cleaner that is supposed to be safe for rubber. The seat is brass and looks fine but I'll take a closer look with a brighter light and magnifying glass. Is it not wise to leave the fuel bowl empty for long periods of time (years)?
 
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Old 04-20-11, 09:22 AM
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Yes, it's best to leave it dry if you will be letting it sit for more than a few months. If you hadn't, you might be looking for a new carb now rather than just fixing a leak. Use regular carburetor cleaner in the spray can and a q-tip to clean the needle tip and down in the seat area. I like next-dimension brand carb cleaner from advance auto parts best.
 
 

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