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Old 06-03-2014, 12:23 AM   #1
watergold
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Join Date: Jun 2014
Location: California
Posts: 1
Default Carb Flooding

Bought a 1986 Haulster with the 22hp OMC engine, Ran great for a bit, then nothing. Kept flooding the engine, had to crank on the engine for five minutes before it would start.

After a bit of investigation, I found out that I had filled the crankcase with gas. Took off the air cleaner and found that the carb was dumping fuel into the breather hose.

Took the carb (Keihin B70F) apart, cleaned it well and adjusted the float. Now when I crank the engine over to fill the bowl and float, fuel dumps out of the front of the carb. Does anyone have any ideas where to go from here? Is my only choice to bite the bullet and buy the $84 rebuild kit?
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Old 06-03-2014, 03:43 PM   #2
CharleyL
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Join Date: Dec 2012
Location: Central North Carolina
Posts: 526
Default Re: Carb Flooding

Welcome to BGW.

Lets see if we can get your Haulster running again. There are several of us on here with quite a bit of Cushman experience, so you may get help from more than one of us. California is a very big State and one of us might be just around the corner from you (but not me) and could help, but you need to at least tell us what town you are in or near.

Possibility #1 - The needle valve rubber is damaged, letting fuel past it into the float bowl even when the float bowl is full, or the float isn't floating any more, so it is not closing the needle valve. Both should be replaced, especially if they are the original 1986 ones.

Possibility #2 - You have hooked the fuel line from the mechanical fuel pump directly to the carburetor without using a bypass filter to return the excess pumped fuel back to the tank. The pump is creating excess fuel pressure that is pushing the needle valve open and over filling the carburetor float bowl.

You can also get fuel in the crankcase if the rubber diaphram in the mechanical fuel pump goes bad, but it wouldn't run out of the carburetor in this case.

I have posted the exploded view and parts list for the Keihin carburetor on this site. A search should bring it up, but if you can't find it I will post it or the link to it, again. I was able to order the carburetor parts that I needed through my local forklift dealer, but it took almost a month to get everything and even ordering just what I needed ended up costing about as much as the rebuild kit that you found. Fuel filters, even the bypass filter, are available through the auto parts stores as is the fuel line. If you use the mechanical fuel pump you need the bypass filter. If you use an electric fuel pump, they are self regulating, so a bypass filter isn't required. Mechanical fuel pumps are harder to find and more expensive than the carburetor kit. An electric fuel pump can be bought locally for $74.95.

Please keep us posted on your progress. We like pictures too.

Charley
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