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Dinnie
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2017/05/30 12:12:16 (permalink)
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HI: Anyone,,,Everyone

I have a Older John Deer riding tractor >>L120 Automatic
I am having a problem to get it to keep running after it starts. When I pour a little gas down in the carb. it appear to run only when that gas is used up. Gas is not getting to the carb. for some reason. SO far I can see that the gas filter do not show any gas inside the plastic filter. IS the gas pump not working??? (the gas pump is the black plastic piece that sit on the side of the engine, that has three host connection, one on each side and one at the bottom). I disconnected the host the goes to the carb. and the gas pump, crank the engine and no gas shoots out of the gas pump. What makes the gas pump, pump gas, because it is not a wired pump????  IS it the short gas host at the bottom of the gas pump, that connects out of a medal box label OHV. Because I notice the short gas host has a cut in the gas host right after it extend out of this metal OHV box mounted on the engine, that appear to be the cover for the engine pistons. Is this cut in this short gas host is what keeping the gas pump from pumping gas to the carb??? I also checked the gas tank fuel line inside the gas tank to see if it was not stopped up, I pulled off the gas host to the tank and blew inside the tank, and I did see bubbles inside the gas tank, so I assumed that gas line inside the tank is not stopped up.  What else can I check to see why gas is not coming to the gas filter, and the carb????? 

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    Mikel1
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    Re: HI: Anyone,,,Everyone 2017/05/30 23:01:00 (permalink)
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    Fuel pump is pulse operated and if there is a cut on the pulse line then it needs replacing.
    The metal ohv box is the valve cover.
    Dinnie
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    Re: HI: Anyone,,,Everyone 2017/06/08 11:23:21 (permalink)
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    I have replaced the fuel pump, replaced the fuel line from the OHV box to the fuel pump. Now after several cranks I am seeing a little gas in the glass/plastic fuel filter, that I was not seeing before. But still it will not get gas up to the pump, the gas filter is not showing full, and I believe gas is not getting up to the fuel pump to get in the carb. After cranking several times the battery run down and I need to recharge it. Is there anywhere else I can look or check to see while the glass/plastic fuel filter is not getting full??? Or how to confirm gas is pumping from the gas tank, up to the fuel filter up to the fuel pump???????? Where is the Carb. on this model located???? Is it right under the big white  carb. filter. if so how do you check the carb. for issues????????  
    Mikel1
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    Re: HI: Anyone,,,Everyone 2017/06/09 00:28:54 (permalink)
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    The fuel filter doesn't have to be full to be working.
    Take the hose off at the carb, use a fuel suitable container under the hose you took off. Now try to start mower, gas should flow out of the hose into the container. If you have a good stream then float valve maybe stuck, clogged carb or faulty fuel solenoid(anti-afterfire solenoid) if equipped.
    Yeah carb is under air filter, take off engine shroud to access the carb.
    Dinnie
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    Re: HI: Anyone,,,Everyone 2017/06/09 11:37:47 (permalink)
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    Thanks for the reply MIKEL1: I will try that, remove the gas hose off the carb, start the engine, and some gas should come out. Where is the float valve, fuel solenoid????? Is all this inside the carb???? And what is the engine shroud??? Is this the engine black cover housing???? 
    Mikel1
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    Re: HI: Anyone,,,Everyone 2017/06/09 22:08:23 (permalink)
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    That's correct while cranking engine fuel should flow out of the hose. The float valve aka float needle is in the carb.
    The fuel solenoid is under or on side of some models, one or two small electrical wires connect to it. If you have one you can usually hear it click when turning key to on position, some are louder than others. All it does is block off main jet with a plunger to prevent the bang when you turn key to off position.
    Yes the engine shroud is the black cover housing.
    Dinnie
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    Re: HI: Anyone,,,Everyone 2017/06/14 10:42:00 (permalink)
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    OK: Thanks to all for any INFO. I have my John Deer back up and running and cutting grass. I replaced the fuel pump, and removed the gas tank cap. I will drill a bigger hole in the cap. Which one was the cause is still a question. Another issue I want to work with is my John Deer cutting system (precision plus) at certain times while cutting, the blade stalls(stop turning) and pick back up turning on it own. Do ant one have any idea what may be causing this????  And how to I replace the engine muffler????? 
    Mikel1
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    Re: HI: Anyone,,,Everyone 2017/06/14 17:16:04 (permalink)
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    One blade stops or both?
    Dinnie
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    Re: HI: Anyone,,,Everyone 2017/06/15 11:27:48 (permalink)
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    Good Question: I thinking all three blades are stalling or stops. May be its the blade on the far right side only. If so what does that mean?? Is that a loose or bad pulley??? Another thing I notice my John Deer blade appear to stall or stops when I am cutting grass and the tractor is lending to the right. But I believe my problem is in the cutting system THE EDGE, my blade belt is not tight as I think it should be. The only way to tighten the belt is by the long black spring, locking it in place. Even after locking it in place, I can use my hand and see the belt still has a little slack in it. There must be another place on the cutting system you can adjust. that will make the blade tighter. How and Where is it???? I notice the blade belt will not tighten when you put the belt on and the cutting system in the lowest cutting level.  Where and how can I check for this????
    Mikel1
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    Re: HI: Anyone,,,Everyone 2017/06/17 00:07:09 (permalink)
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    Is this a new belt?
    What year is your L120?
    Dinnie
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    Re: HI: Anyone,,,Everyone 2017/06/20 09:58:32 (permalink)
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    Thanks for the REPLY: No this is not a new belt. and it has been cutting fine, with still some stalling. John Deer L120 Automatic Product IP GXL120A067917----L120A---070903
    4067770128B1
    030610Yg00392
    How to know if it not the big round pulley under the motor that turns the belt, is causing the stall????? Can I change one of the smaller pulleys with a larger pulley, that will take up some of the slack and make the belt tighter????   
    Mikel1
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    Re: HI: Anyone,,,Everyone 2017/06/20 19:27:15 (permalink)
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    When does it stall, tall grass or just random?
    Dinnie
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    Re: HI: Anyone,,,Everyone 2017/06/21 10:49:23 (permalink)
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    IT appear to be random: Because the grass is not that tall. Funny it appear that when the riding tractor is cutting and tilted to right, is when I notice it the most.  
    Mikel1
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    Re: HI: Anyone,,,Everyone 2017/06/22 22:33:20 (permalink)
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    Sounds like a problem with the electric clutch or possibly a wiring issue. Also belt may just need replacing.
    post edited by Mikel1 - 2017/06/22 23:15:13
    Dinnie
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    Re: HI: Anyone,,,Everyone 2017/06/23 11:05:15 (permalink)
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    which BELT DO YOU RECCOMEND:  briggs and Stratton --406777-0128-E1
    Mikel1
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    Re: HI: Anyone,,,Everyone 2017/06/23 16:55:52 (permalink)
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    I would use an oem belt.
    I would also check the pulleys before taking belt off while tension is applied. Then take belt off and check them again.
    Dinnie
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    Re: HI: Anyone,,,Everyone 2017/07/05 11:29:54 (permalink)
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    HI: Mikel1. Thanks for all the information.. My John deer was back running again, and now I am having the same problem as before, trying to get it started and keep running. It appear to only run on the gas I pour down in the carb. IS it true that a faulty solenoid will cause the engine to not get gas??? I just two weeks ago replaced the fuel pump, took off the gas cap, and it ran and cut grass for two hours. But here again I am having the starting problem. Is it true that when I turn the key on the engine, I should here the solenoid click???? can I here this sitting on the  riding motor sit, or do I need to get down close to the solenoid to here the click???? Under the Carb there is a metal like bowl, with a cap type metal piece attached on the very end with two wires connected to this cap piece, is this the solenoid???? How do I TAKE IT OFF, AND how can I test it to see is that what is causing gas not getting to the carb. JOHN DEERE L120 AUTOMATIC..     
    Mikel1
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    Re: HI: Anyone,,,Everyone 2017/07/05 17:51:46 (permalink)
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    Yeah you should hear it click when key switched to "on" position not cranking, some are louder than others. It can prevent it from starting due to plunger at main jet but not keep carb from getting fuel.
    Dinnie
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    Re: HI: Anyone,,,Everyone 2017/07/10 12:06:10 (permalink)
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    HOW to I take off the solenoid switch???? Or how can I test the solenoid switch???? IS it the bottom metal cap like piece with the two wires attached on the metal bowl under the carb.
     
    John Deer L120 Auto 20-HP Brig. & Strat. 48" cut  
    Mikel1
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    Re: HI: Anyone,,,Everyone 2017/07/10 17:15:31 (permalink)
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    Link below see item #947 & 947A, if you scroll down and click on it. You should see a picture, you will notice that it screws on.
    https://www.jackssmalleng...carburetor-fuel-supply
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