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JD LA120 stops runing after 1 hr of use
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Posted by psi5 md (My Page) on Wed, Nov 25, 09 at 11:27
| my John Deere LA120 will run for about one hour and then stops as if it is out of gas. Actually the opposite - i think it floods -I learned to remove the hose from the fuel filter and let the gas go back to the tank - put everything back together and it runs for another hour. 1 minute job every hour - (already replaced the fuel filter)- ideas? |
Follow-Up Postings:
RE: JD LA120 stops runing after 1 hr of use
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| Is there black smoke all of a sudden or why else do you believe that it is flooding? From your description on how you seem to get it up and running, maybe the fuel system isn't venting. Try loosening the fuel cap and see if you have the same result. |
RE: JD LA120 stops runing after 1 hr of use
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I agree - I can not confirm flooding but the fuel filter is filled to about 1/2 or 3/4 level - removing the line and sending air and the gas back to the tank helps - the process restarts - I will check the venting of the cap.
by the way, it is a B&S engine - 21HP model 441677-0113-E1
I will try loosening the cap when it stops raining! |
RE: JD LA120 stops runing after 1 hr of use
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***"the fuel filter is filled to about 1/2 or 3/4 level - removing the line and sending air and the gas back to the tank helps"***
PAY NO ATTENTION to a fuel filter that appears to be less than full. It means nothing. What does mean something is how you describe the sending air and gas back to the tank. If you actually SEE, the gas racing back toward the tank when you loosen the fuel hose........that is PROOF that the fuel tank was holding a vacuum caused by a non-venting cap (probably a clogged vent hole in the cap). Use a stiff piece of wire or paper clip to probe the hole in the fuel cap, both sides if possible. If you have compressed air, blow the hole out after probing. |
RE: JD LA120 stops runing after 1 hr of use
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makes perfect sense - there is a vacuum build up - I will cleanup the cap -
by the way, no black smoke! |
RE: JD LA120 stops runing after 1 hr of use
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| I have a LA 135 and the same thing happened. It was a small seed blocking the vent hole of the gas cap. |
RE: JD LA120 stops runing after 1 hr of use
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the blocked hole in the gas cap was it!
thank you all for the help |
RE: JD LA120 stops runing after 1 hr of use
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RE: JD LA120 stops runing after 1 hr of use
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| Make sure that the vent on the fuel cap is not plugged. Also, check the fuel line that is coming out of the tank. It is possible that the line is getting pinched between the tank and the frame causing lack of fuel flow. |
RE: JD LA120 stops runing after 1 hr of use
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| Where is the charging port for the L120? |
RE: JD LA120 stops runing after 1 hr of use
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| To check the charging system on an L120, locate the voltage regulator that is attached to the engine. There will be two yellow wires and one red wire on it. Unplug the stator from the regulator and use a digital voltmeter and check the AC voltage coming out of the stator-should be approx. 30 volts AC. If not, the stator is probably bad. The regulator has probably failed letting battery voltage back into the stator causing it to short out. |
RE: JD LA120 stops runing after 1 hr of use
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| You guys rock! I have a plow blade on my Scotts 2048 and same thing...engine quit after 20 min and won't run for more that 2 sec on each start. I read this post, cleaned out the fuel cap vent hole, and I'm back in action. Thanks! |
RE: JD LA120 stops runing after 1 hr of use
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| Never had that problem,but am glad to know about it,so will check my fuel cap and hope I don't forget it in the future. This board has a lot of smart people on it,which makes me glads I found it. |
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