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LA145 Head Scratcher

3816 Views 31 Replies 12 Participants Last post by  midwesties
I have an LA 145 that is driving me crazy and I'm hoping someone can point me in the right direction.
Here is the problem. I got this tractor which had been sitting a while and I got it basically from an estate sale. The engine has 48 hrs and everything is in great shape. Before I got it the son of the previous owner tried to get it to run but got no where starting it. I cleaned up the carb and was able to get it to run a bit by priming it running gas down the intake however it was obvious the o-rings where dried out. Rather than just buy the o-rings I opted to buy a new carb (just a few dollars more. It now runs good (maybe a sputter here and there) but the only way to start it is to pour gas in the intake. Once I've done that it runs and I can restart it. Once it sits over night I have to prime it again.
So in the interest of saving time: I've checked the gas lines, changed the fuel filter, even tried an electric fuel pump.
There is gas in the float, but it won't start. I admit I don't have much experience with these Briggs 2 cylinders and these carbs are new to me.
Any suggestions, things maybe I missed?
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I'm having the exact same problem and it happened all of the sudden. I replaced the plugs, fuel pump, carburetor, fuel filter, and still the same problem. It will only start and run when primed. I checked the pump, getting plenty of gas.
I also checked my plugs (new) to verify gap, and verified spark. The solenoid on the carb (new) is getting 13 volts. The new carb has new gaskets, still nothing unless I prime the carb. It truly is a mystery.
Update on my situation with this same problem.

So, I replaced the intake gaskets, still nothing. I took off the air filter cover and covered the intake with my hand, still no cold start. I also blew out the fuel lines, and replaced the fuel filter (again) just in case. If I prime it, starts right up and stays running. It will only start back up without being primed if I run it for 15-minutes or more.

Previously, I replaced the following:

- plugs (correct gap, verified spark)
- fuel pump (verified it is working correctly)
- carb (new gaskets came with it)and solenoid (verified solenoid is getting 13 volts)
- air filters
- fuel filter
So, I had a guy that fixes up old mowers tell me that it’s the fuel lines. He said that the old fuel lines collapse on themselves and choke out the fuel supply. Makes sense. That’s the next step for me.
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