Long on-going problem with Tecumseh Engine Model: OHH50-68023J. Carb leaking. OEM carb part # 640340. After many years of service the carb suddenly started leaking. Motor is part of a Cyclone Rake tow behind vac. I'm stumped. I have rebuilt my share of carbs but this problem which SEEMS like a common one, cannot be fixed. I have tried "everything".
Rebuilt the orignal carb about 7 years ago. Worked fine until just last year.
Rebuilt original again but this time the carb started leaking after 5 to 10 minutes of being pulled around the yard picking up leaves.
Rebuilt carb again. Same problem. Runs while stationary and all is fine .. then start driving around yard and within 5 to 6 minutes engine floods and stalls and gas starts pouring out of carb mouth.
So I bought a new carb. Replace the NEW carb. And same thing. after towing it around the yard for five minutes engine stalls and gas pours out of brand new carb.
So I took the brand new carb apart carefully, check float level, checked float for leaks etc. examined the needle and seat and all looked fine. Put it back on the engine and same problem.
Checked everything. Finally bought a 2nd new carb. Same thing. Check fuel tank all hoses, and everything is fine. Unfortunately I when I bought the first new carb I tossed my orginal one. The first and 2nd replacement carbs were cheap China made things and both had different needle setups. One had the float needle with a normal press in place seat. Then next new version they got rid of the seat and instead manufactured the needle with a rubber tip on it that made it's seal directly with the metal of the carb. That one also poured gas out like an open faucet after 7 minutes.
So I then decided I needed to find an original OEM carb and found someone with some NOS units for sale for about 4 times what I was paying for the China units. I bought one. It was an OEM product made in US, and was exactly like the 11 year old one I had thrown away. I installed that and STILL had the same problem.
Engine always starts on first pull. Runs properly and correct but only for 5 to 6 minutes. This has me stumped. Once the engine stalls and the fuel starts pouring out of the carb mouth, it does not stop. It's like I opened up a faucet.
The Cyclone Rake I'm using is in perfect condition and my problem is they no longer make engines for my model and a new engine would require a change to their newer Briggs line which has different mounts and would require I also purchase a new blower impeller and housing. It would be cheaper for me to buy a whole new unit. Anyone have a clue why the carbs keep doing this?
Rebuilt the orignal carb about 7 years ago. Worked fine until just last year.
Rebuilt original again but this time the carb started leaking after 5 to 10 minutes of being pulled around the yard picking up leaves.
Rebuilt carb again. Same problem. Runs while stationary and all is fine .. then start driving around yard and within 5 to 6 minutes engine floods and stalls and gas starts pouring out of carb mouth.
So I bought a new carb. Replace the NEW carb. And same thing. after towing it around the yard for five minutes engine stalls and gas pours out of brand new carb.
So I took the brand new carb apart carefully, check float level, checked float for leaks etc. examined the needle and seat and all looked fine. Put it back on the engine and same problem.
Checked everything. Finally bought a 2nd new carb. Same thing. Check fuel tank all hoses, and everything is fine. Unfortunately I when I bought the first new carb I tossed my orginal one. The first and 2nd replacement carbs were cheap China made things and both had different needle setups. One had the float needle with a normal press in place seat. Then next new version they got rid of the seat and instead manufactured the needle with a rubber tip on it that made it's seal directly with the metal of the carb. That one also poured gas out like an open faucet after 7 minutes.
So I then decided I needed to find an original OEM carb and found someone with some NOS units for sale for about 4 times what I was paying for the China units. I bought one. It was an OEM product made in US, and was exactly like the 11 year old one I had thrown away. I installed that and STILL had the same problem.
Engine always starts on first pull. Runs properly and correct but only for 5 to 6 minutes. This has me stumped. Once the engine stalls and the fuel starts pouring out of the carb mouth, it does not stop. It's like I opened up a faucet.
The Cyclone Rake I'm using is in perfect condition and my problem is they no longer make engines for my model and a new engine would require a change to their newer Briggs line which has different mounts and would require I also purchase a new blower impeller and housing. It would be cheaper for me to buy a whole new unit. Anyone have a clue why the carbs keep doing this?