1971 55 hp outboard float? Gas leaking out of a small hole above lower end.

[jmk]

I rebuilt the carb, but I can't find the float for this motor. Does anyone know if there is a compatible float I can cross with this? There is a lot of gas that floats up after shutting down the motor. It bubbles up from a small hole down by the lower end. Could anything else cause this other than the float? Is there a way to test the float while the carburetor is hooked up? The motor runs fine otherwise, but I don't like to run it with the gas leaking. Thanks, jmk

 

[Nordin]

Re: 1971 55 hp outboard float? Gas leaking out of a small hole above lower end.

The carbfloat should be as follows. Turn the carb upside down with the cup removed. The float should be parallell with the carbcasting for the cup. Unburned fuel coming from the hole in the lower leg is normal because when it idles much gas would not burn in the engine. It comes out with the exhauset.

 

[fucawi]

Re: 1971 55 hp outboard float? Gas leaking out of a small hole above lower end.

sounds like a problem with the needle valve seat ...operated by the float that is the only way it can leak out when the fuel level gets too high

 

[jmk]

Re: 1971 55 hp outboard float? Gas leaking out of a small hole above lower end.

Ok, I will take the carb apart again and check. Maybe I will hook the gas line up with the carb off and see if it stops the fuel too. Thanks for your help guys, Jmk.

 

[jmk]

Re: 1971 55 hp outboard float? Gas leaking out of a small hole above lower end.

Well I took the carb off and checked it. It seems to be fine. When I fill it up with gas it shuts and I cant pump any more gas threw. The plunger bulb gets hard and stays hard. I also have two of these motors and tried the carb off the other one, same thing. I think maybe I need to do a compression check. The motor runs smooth but maybe some blow by is washing gas down the exhaust tube? I have to buy another impeller. This is my third impeller in a year. I think test running it in a fifty gallon drum cut in half ruins my impellers with all the gas getting into the tank. The impeller looses it's bond between the rubber and the metal part that drives it in the center. I can spin it inside while holding the rubber blades. The first time I thought it was a fluke, but now it must be test running it in a tank that gets outboard fuel in it. How frustrating! You would think this part would be made with rubber that doesnt swell when exposed to fuel.

 

[jmk]

Re: 1971 55 hp outboard float? Gas leaking out of a small hole above lower end.

Did these motors always leak a lot of gas?

 

[fucawi]

Re: 1971 55 hp outboard float? Gas leaking out of a small hole above lower end.

reading your post again yes there are holes in he lower part of the exhaust to drain surplus fuel so running in a barrel will get a bit oily.....I think its more age than a small amount of oil that causes the impeller to fail.

surplus fuel in the crankcase is also discharged into the exhaust ...just skim the oil off the top of the test tank ....

 

[jmk]

Re: 1971 55 hp outboard float? Gas leaking out of a small hole above lower end.

reading your post again yes there are holes in he lower part of the exhaust to drain surplus fuel so running in a barrel will get a bit oily.....I think its more age than a small amount of oil that causes the impeller to fail.

surplus fuel in the crankcase is also discharged into the exhaust ...just skim the oil off the top of the test tank ....

Yes I agree that impellers go with age, but three in one year?

 

[fucawi]

Re: 1971 55 hp outboard float? Gas leaking out of a small hole above lower end.

Three impellers ....WOW I think you need to look for another problem ..too much mechanical load would tear the centre out ....are you sure you have the right impeller? Too thick for the housing would create a high load ...I would check impeller thickness and depth of impeller chamber with a proper depth gauge /digital caliper..could you have a gasket missing ...

Put the impeller in the housing off the motor and see if its proud of the housing ....

 

[rickye]

Re: 1971 55 hp outboard float? Gas leaking out of a small hole above lower end.

you have a diffrent problem some where" no way should you go through 3 in one year. and the gas and oil mix should not eat them up?

 

[jmk]

Re: 1971 55 hp outboard float? Gas leaking out of a small hole above lower end.

you have a different problem some where" no way should you go through 3 in one year. and the gas and oil mix should not eat them up?

They are not getting eaten up. The impeller is just like new, but the bond between the brass center part and the rubber spins. I thought the gas was reacting to the bond. I was wrong on the impeller going bad this last time. The thermostat might have ben stuck or something. I just thought that it was the same thing as last time when my overheat light came on. I noticed that after I was witnessing no water going threw the clear water hose at the end of the thermostat. It works good now, but the gas problem is really bad. I took the boat out tonight and you can see a yellow cloud coming up from the lower end. When it reaches the surface it is in bubbles that make gas slicks. When I drove it ran smooth. Starts with a flick of the key. It doesn't have any trouble running at idle sifting back and forth. When I pulled it out of the water it was like I dumped a cup of gas all the way up the ramp. All the water draining out was foamy of gas from the lower end spilling out all over. While out on the lake when I stop I get a slick on the water till it drains. I tried pumping the bulb and it wasn't all the way hard I got about one pump till it was firm, and no gas came up afterwards. I thought I was going to see gas leaking then like the needle valve wasn't closed. I wonder if maybe blow by or a head gas get leak would cause this? I am waiting for a compression gage to check for compression. Hard to believe it with how well it runs, but I don't know. Now it over heated last fall when the last impeller went bad, but it still was leaking gas, but not bad. I do notice steam after running full blast for about a mile after slowing down to idle for a while, but the overheat light doesn't come on. I feel like it's just about to though.