Kohler command 38 pro efi fueling problems.

[Mick Dempsey]

Started running like dogshite yesterday.

So much fuel is pouring in, two vids one of the fuel leaking out of exhaust manifold, next is of spark plug removed (spark plug working by the way) crazy amount of fuel coming out.

 

Any ideas muchly appreciated. 

[Tree monkey 1682]

Carb issues? Our kholar command 15hp did this , could it be the float sticking open

? Or stiff gaskets? Only a wild guess

[rapalaman]

15 minutes ago, Tree monkey 1682 said:

Carb issues? Our kholar command 15hp did this , could it be the float sticking open

? Or stiff gaskets? Only a wild guess

The efi engine has fuel injection so no carb to have problems with. No other experience from me I’m afraid 👍

[openspaceman]

Second video shows it working on one cylinder and the other not firing and fuel spurting?

 

I'd say the high pressure connection between the fuel rail and the injector has come adrift in the manifold assuming it is at all like a car.

Edited January 27 by openspaceman
spelling

[Dan Maynard]

Looks like a tap not turning off to me, as if injector valve not shutting. Then that could be electrical or a fault in the injector itself.

[AHPP]

44 minutes ago, Dan Maynard said:

Looks like a tap not turning off to me, as if injector valve not shutting. Then that could be electrical or a fault in the injector itself.

 

Swap injectors like when you're diagnosing a dead coil.

[Ty Korrigan]

On 27/01/2026 at 12:45, Mick Dempsey said:

Started running like dogshite yesterday.

So much fuel is pouring in, two vids one of the fuel leaking out of exhaust manifold, next is of spark plug removed (spark plug working by the way) crazy amount of fuel coming out.

 

Any ideas muchly appreciated. 

IMG_4596.mov IMG_2480.mov

Did ya fix it ?

[Mick Dempsey]

29 minutes ago, Ty Korrigan said:

Did ya fix it ?

Thanks for asking.
Got tomorrow booked off to have a crack at it.

 

I could take it to a garden machinery place (and this still might happen) but I’m worried they’ll play ‘parts bingo’ and présent me with a massive bill.

 

I’ve done research on the internet (yeah, I know!) we’re looking at a leak in the float causing over fuelling.

 

If it gets too deep we’ll put it back together and drop it off.

[Peter 1955]

16 minutes ago, Mick Dempsey said:

 

 

I’ve done research on the internet (yeah, I know!) we’re looking at a leak in the float causing over fuelling.

 

I could be missing something here, but if it's fuel injection, where's the float? A thirty second Google on Kohler efi suggested that much of the fuel supply is adjusted by an oxygen sensor in the exhaust. A possible candidate perhaps? 

I know that nowadays just about every malfunction in a vehicle engine traces back to a sensor. 

[Mick Dempsey]

15 minutes ago, Peter 1955 said:

I could be missing something here, but if it's fuel injection, where's the float? A thirty second Google on Kohler efi suggested that much of the fuel supply is adjusted by an oxygen sensor in the exhaust. A possible candidate perhaps? 

I know that nowadays just about every malfunction in a vehicle engine traces back to a sensor. 

It’s a float in the pump rather than the carburettor. 

 

Edited 53 minutes ago by Mick Dempsey
I’ll check out the sensor thing though, thanks.