Reed/Leaf Valves

[Jose67]

Can faulty reed/leaf valves cause the fuel/oil mixture to seep out of the carbs? Could an overheated engine have caused damage to the valves? After a day on the water I have traces of the fuel/oil mixture seeping down from the lower engine cowl cover onto the mid section. I have checked hoses for leaks and found none, looks like it is coming from the carb throats.

 

[flyingscott]

Can faulty reed/leaf valves cause the fuel/oil mixture to seep out of the carbs? Could an overheated engine have caused damage to the valves? After a day on the water I have traces of the fuel/oil mixture seeping down from the lower engine cowl cover onto the mid section. I have checked hoses for leaks and found none, looks like it is coming from the carb throats.

No reed valves will not cause that. What motor do you have.

 

[Chris1956]

More likely is the carb float + seats are not sealing. Could be a leaky crankshaft seal as well. You would see that leak under the flywheel.

 

[racerone]

On your 150 HP 2000 model do you tilt the motor up with fuel in the carburetors ?-----Could be leaky float valves.-----Do you see any fuel leaking from carburetors when you really squeeze the primer bulb?-----Hose from the vapor pump going into the airbox ?

 

[Jose67]

No reed valves will not cause that. What motor do you have.

2000 model Johnson 150hp / J150vxsss

 

[Jose67]

More likely is the carb float + seats are not sealing. Could be a leaky crankshaft seal as well. You would see that leak under the flywheel.

Do not see anything leaking from under flywheel.

 

[flyingscott]

If this is happening when the motor is tilted up, look at the airbox seal or drain hose

 

[Jose67]

On your 150 HP 2000 model do you tilt the motor up with fuel in the carburetors ?-----Could be leaky float valves.-----Do you see any fuel leaking from carburetors when you really squeeze the primer bulb?-----Hose from the vapor pump going into the airbox ?

I do trailer the boat with motor tilted up slightly and fuel in the bowls. I haven't tried the squeezing of the bulb and checking for leaks yet.

 

[tphoyt]

I would lean towards a float or float valve problem as well

 

[440roadrunner]

I don't know, I'd guess it is caused mostly by engine tilted. I try to run some/ most/all of the fuel out of the carb when coming in. This can be difficult to "time" but I just yank the fuel hose off when coming in the last ??feet. Leaving the fuel hose connected can cause fuel perkulation from heat

 

[racerone]

Many of these big motors do not have the hose with a fitting to pull off.

 

[Jose67]

Many of these big motors do not have the hose with a fitting to pull off.

That would be correct, this motor does not have the quick disconnect.