I've got a JD LX279 with liquid cooled 2 cylinder Kawasaki. It was running rough, seemed to be missing if I'm running over rough ground. I noticed some gas coming from the top vent tube. I took the carb off to clean it and stripped the main jet trying to remove it. I replaced the carb with a new one and it is also dripping gas from the top vent tube while running. Obviously not a carb issue. Is this an issue with the fuel pump? Attached a photo of the type of fuel pump it uses.
Gas leaking from carb top vent tube
- Thread starter arch252
- Start date
I wouldn’t blame the pump so fast. To me it’s more likely the float needle and seat not shutting off, allowing to much fuel to enter the carb. I would be removing the carb and check to make sure they are working properly.
Did you replace the fuel line? Could be the fuel line is deteriorated on the inside and parts of it crumbled out and got between the needle and seat. I always replace the fuel filter and line between the filter and carb when replacing carb.
The fuel line from the fuel pump to the carb was stiff but not deteriorated, it was less than 3 years old but I went ahead and replaced it as well.
I can't think of any other cause than the fuel pump but don't know what would cause a fuel pump to do that.
I can't think of any other cause than the fuel pump but don't know what would cause a fuel pump to do that.
If fuel is exiting the carb through the vent tube, the float needle is not shutting off fuel to the float bowl. If you purchased a carb off Fleabay it wouldn’t surprise me that it is bad. I have no idea why you would suspect the fuel pump, as it must be working fine if you have excess fuel in the carb.
The OEM carb was leaking fuel out of the top vent tube. I replaced it with an aftermarket carb that did EXACTLY the same thing. Common sense tells me something else caused both carbs to malfunction in the exact same way. I don't know that it's the fuel pump but I don't know what else it could be, that's why I posted.
bertsmobile1
Lawn Royalty
- Joined
- Nov 29, 2014
- Threads
- 65
- Messages
- 24,995
I am a bit confused here.
You say fuel is leaking from the carburettor vent tube
I don't see a carburettor vent tube listed in the IPL I have here
And they have not been fitted to mower engines since around 2000 when venting to atmosphere became illegal
So can we have the Kawasaki engine details please ?
You say fuel is leaking from the carburettor vent tube
I don't see a carburettor vent tube listed in the IPL I have here
And they have not been fitted to mower engines since around 2000 when venting to atmosphere became illegal
So can we have the Kawasaki engine details please ?
- Joined
- Feb 19, 2020
- Threads
- 118
- Messages
- 12,657
Am128355 (Kawasaki 15003-2653)
Replacement for Kawasaki 4 stroke Carburetor engine Models FD501V-AS03 FD501V-AS05 FD501V-BS02 FD501V-BS03 FD501V-BS05 FD501V-CS02 FD501V-CS05 FD501V-DS05 FD501V-ES05
Connect fuel pressure gauge to the output of the fuel pump and report your findings.
Replacement for Kawasaki 4 stroke Carburetor engine Models FD501V-AS03 FD501V-AS05 FD501V-BS02 FD501V-BS03 FD501V-BS05 FD501V-CS02 FD501V-CS05 FD501V-DS05 FD501V-ES05
Connect fuel pressure gauge to the output of the fuel pump and report your findings.
Last edited:
I don't even know how to measure the fuel pressure so I know I don't have the equipment for it.
I don't typically diagnose by replacing parts but if the fuel pump is the most likely cause I don't mind spending the $15 on a new one. I just needed to know if a fuel pump could fail to cause excessive fuel to be pumped.
I don't typically diagnose by replacing parts but if the fuel pump is the most likely cause I don't mind spending the $15 on a new one. I just needed to know if a fuel pump could fail to cause excessive fuel to be pumped.