Honda GXV670 Carburetor

[Mr Mower Man]

I've got a Huslter Super Z in the shop with a 24HP Honda GXV670 TAE2 GJAH. The owner has complained about it dying on him, but not all the time. It was running fine when he brought it over, and it ran fine for me today when I drove it around to my wash bay to give it a bath. He had taken the needle and spring out of the anti-afterfire solenoid to try to help it, but I really don't think that was his problem. I reassembled the solenoid, made sure it worked properly (I had to clean up some varnish) and put it back in the carburetor. But before I had a chance to fire the thing up to see if I could get it to act up, I noticed that I had fuel dripping under the mower. The fuel was coming out of a hose that came from the carburetor. After looking at the IPL, I learned that there's a drain tube coming off of the bottom of the carburetor, but that's not the one that the gas was coming out of. It came from the top of the carburetor, a fitting that kinda sticks out off to the side. As far as I can tell, the hose wasn't connected to anything on the other end (I found the other end around the base of the engine), so it looks like a drain tube as well. So I guess my carburetor's draining from the top, which seems to indicate a leaking inlet valve. Am I on the right track?

Is there a drain tube coming from the top of the carburetor so that when there's a failure in the inlet needle valve, gas doesn't run into the crankcase? What's the purpose of the drain tube at the bottom of the carburetor? Is it to drain any water or sediment that may be in the bottom of the bowl? I've never seen this engine before, so I really don't know the intent behind all its features.

[choogie57]

Check screen at bottom of fuel tank mine acted the same.

[KE4AVB]

I've got a Huslter Super Z in the shop with a 24HP Honda GXV670 TAE2 GJAH. The owner has complained about it dying on him, but not all the time.It was running fine when he brought it over, and it ran fine for me today when I drove it around to my wash bay to give it a bath.

Being an intermittent problem your probably going to do so serious mowing to get it to act up. I have thermal problems with ignition systems that would only show up after 30 minutes of mowing. These kinds problems of a be very hard to narrow down too as they can disappear just fast as they show up.

Is there a drain tube coming from the top of the carburetor so that when there's a failure in the inlet needle valve, gas doesn't run into the crankcase?

It is a vent line for the carburetor. I kinda surprised fuel isn't running out the carburetor too but maybe the carb design shuts the fuel off completely when solenoid is closed completely.

What's the purpose of the drain tube at the bottom of the carburetor? Is it to drain any water or sediment that may be in the bottom of the bowl? I've never seen this engine before, so I really don't know the intent behind all its features.

The purpose is so fuel, water, and other contaminates can be drain into a catch container. It is also for drain the fuel before long term storage.

So I guess my carburetor's draining from the top, which seems to indicate a leaking inlet valve. Am I on the right track?

I would think so or at least that is what I would check for. Don't forget to check the float too for fuel.

[Mr Mower Man]

I'll definitely check the cleanliness of the fuel tanks and clear out all the fuel lines. They're not excessively dirty, dry, or cracked, so I think they're OK. I'm going to tear into the carburetor, throw it into the ultrasonic cleaner, and replace all the seals and the inlet valve, possibly even the float if it's bad. There was evidence of varnish in the fuel solenoid, so there's probably some gum buildup in the carb too. And then the owner and I will have a little talk about fuel treatment, which he admits he doesn't do.