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  #1  
Old 06-15-2022, 11:14 AM
kodpkd kodpkd is offline
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Default Fuel in oil
I have a Cadet XT1. Yesterday I found a ton of fuel in the oil. I know a bad needle/seat can cause oil to leak past the carb into the oil. I removed the carb and tested the needle/seat and found it to be sealing tight.
The day it happened it got really hot,,,, 100*,,,, Is it possible the seat is good but the rise it temp was just to great and over rode the needle/seat?

I know installing a fuel shutoff valve would help.
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Old 06-15-2022, 11:47 AM
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IF this engine has a fuel pump, it could leak fuel into the crankcase.
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Old 06-15-2022, 12:52 PM
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Quote:
Originally Posted by 1711Cub View Post
IF this engine has a fuel pump, it could leak fuel into the crankcase.
I'm pretty sure the newer ones can't leak in the crankcase (not mechanical pumps).

OP -- what engine? Kohler 7000? Courage? "CC"? Kawi?
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Old 06-15-2022, 12:56 PM
kodpkd kodpkd is offline
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it is a Courage SV541 engine, 18 hp, 597cc. It doesn't have a fuel pump. It does have the electric shut off on the bottom of the carb. This is energized to the on position, when the power is removed it closes. But I did have a LOT of fuel in the engine.
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Old 06-15-2022, 01:58 PM
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The solenoid on the carb does not control fuel coming into the carb bowl.
When you turn off the key, it only blocks fuel already in the carb bowl from going up the main jet to prevent backfire (haha!).
Fuel can still enter the bowl if the needle/seat is bad or crap in the bowl may be inhibiting float movement.
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Old 06-15-2022, 05:38 PM
kodpkd kodpkd is offline
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The fuel comes into the bowl through the needle/seat then, when the shutoff is open, up into the throat of the carb. If the shut off is closed fuel can't get into the throat of the carb then into the engine. So essentially the solenoid is in fact shutting the fuel off from going into the engine.
Taking the bowl off the carb didn't reveal and crud in the carb.
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Old 06-15-2022, 06:39 PM
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Originally Posted by kodpkd View Post
The fuel comes into the bowl through the needle/seat then, when the shutoff is open, up into the throat of the carb. If the shut off is closed fuel can't get into the throat of the carb then into the engine. So essentially the solenoid is in fact shutting the fuel off from going into the engine.
Taking the bowl off the carb didn't reveal and crud in the carb.
A. The plunger tip on the shutoff solenoid is a metal plug that closes off the passage of the main jet, which is also made of metal. Good enough of a seal to do a momentary job of stopping fuel to prevent backfire, but hardly what I would consider an absolute seal.

B. Even if the plunger could stop all fuel flow up the main, there are other passages up to the throat. So if the float chamber is flooded the fuel will get up to the throat anyway.
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Old 06-15-2022, 08:01 PM
kodpkd kodpkd is offline
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Mine has a rubber stopper on the end of the plunger.
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Old 06-16-2022, 08:43 AM
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That's great! I'm happy for you.
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Old 06-16-2022, 09:57 AM
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I have a rubber stopper on my toilet, -----yep it leaks
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