Engine LA-135 hard cold start with Briggs 22HP

Nytom

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Every time I attempt to cold start my LA-135 it has to turn over with or without choke at least 30 seconds or so to start. After it has run even a few minutes it will start instantly after that, the rest of the day. Almost like the gas has drained from the carb. Is there a check valve in the line that may be stuck open so maybe it's feeding back to the tank???? There's no dripping or wet spots under the carb. I have tried starter fluid before turning over and with that it starts instantly. Gas is not getting to the cylinders on cold start. Any suggestions? I keep a trickle charger connected since the hard starting has run down the battery in the past. Also I change the plugs every year along with oil & filter changes every 25 hours. Any suggestions??
 

SeniorCitizen

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After adjusting the choke several times on my LA-135 to be certain that was correct it became so aggravating I made my own gasoline primer system so the air filter cover didn't need removing to prime. It made a world of difference in starting.
 

bertsmobile1

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There are a lot of things that can cause hard cold starting from a malfunctioning choke to blocked idle circuit to low fuel level in float bowl to sticky valve worn rings & blown head gasket
 

Nytom

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May have found the problem. The internals of the fuel cap have some sort of check valve or some type of shield and it's not venting. It looks like a vacuum is building in the tank when it's run. When the engine is shut off for a length of time the fuel seems to be sucked back into the tank till the pressure equalizes. I removed all the internal parts on the cap and so far after two days it seems to be starting correctly after a couple revolutions of the crank.
 

Nytom

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Problem solved. Just to check my suspicion I put the gas cap parts back in and ran the tractor for a while. Vacuum built up in the tank. Ran it again and then let it sit. Sure enough, it started hard. Not sure why the cap was built so complicated when only a vent hole was needed. Maybe it had the wrong cap installed from the factory. You
 

Nytom

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glad you got it going!

This has been the problem since the tractor was new. Have to keep a eye on it though. Afraid the gas is going find a way to leak. Those engineers at John Deere didn't add those parts to the cap for nothing. I'll keep you posted.
 

Nytom

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Still starting fine since gutting the internals on the gas cap. Once in a while I get a sniff of gasoline but haven't seen any leaking or wet areas around tank. Calling this case closed.:smile:
 

bertsmobile1

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On the Califonia models some AYP made mowers had a loose thread on the cap.
The tank breathed via he loose threads.
The reason ?
If they had a real breather it had to be fitted with a check valve and charcoal filter.
Thus if you tightenend the cap too much you goat a vacuum seal
 
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