Kolher Courage 23hp gas in oil

kennytractor · May 11, 2022

I have a two cylinder Kolher Courage 23hp engine. I noticed it is about one inch over full on the dipstick after sitting over the winter.

The fuel pump sits directly above the valve cover. This is where the pulse line is connected. Is it possible for gas to leak into the valve cover through the
pulse line? Is there a way to test the pump?

Engine starts and runs fine like it always has. Maybe I just need to clean the carburetor.

T.R.K. · May 11, 2022

Yes. If you have a hand vacuum pump you can connect to the pulse port and apply vacuum while holding your finger over the vent hole. Be sure no air leaks past your finger as an air leak there will make the pump appear to fail the test. If the diaphragm is o.k. it will hold 10 inches (water) vacuum with no problems.

while is it possible the fuel pump is your problem, A far more likely senario is the needle valve in your carburetor leaked and allowed fuel to fill your crankcase. In this case, the best fix is to replace the carburetor. In my experience, if you attempt to repair the existing carburetor it usually does it again in a few months.

p.s. Don't run it until you change the oil. Gasoline diluted oil is murder to piston rings.

Aleuicius · May 12, 2022

Check crankcase ventilation, too. The engine should be hot enough to vent most of the vapors in the case before cool-down is sufficient for gas vapors to condense and run into the oil.

Geo-TH,In · May 12, 2022

I have installed a 12v solenoid valve on any carb that drips gas or gas gets in the oil.

Which only happens when the gas tank is higher than the carb.

I've never had a fuel pump go bad. Doesn't mean your problem isn't caused by diaphragm leaking gas.

attach a hose to the vacuum side and suck on the hose. If you taste gas, you have a bad pump.

Rodney51Cub · May 12, 2022

Info from B&S product information sheet.

Test will work for any of that style pulse fuel pump

Three steps for testing fuel pump.

Use a hand held vacuum pump.

Do not apply more than 10 psi to pump during tests.

1. Apply pressure to pulse line while holding thumb over screen.
Pressure should hold.
Apply pressure to pulse line with thumb off screen.
Air should easily pass through screen.

2. Apply pressure to fuel inlet line while holding thumb over out line.
Pressure should hold.
Apply pressure to inlet line with thumb off outlet line.
Air should past through.

3. Apply pressure to pump outlet line.
Pump pressure should hold.

If any of these tests are bad, replace pump.

Kolher Courage 23hp gas in oil

kennytractor

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T.R.K.

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Aleuicius

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Geo-TH,In

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Rodney51Cub

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