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JD 318 garden tractor wont stay running
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schmitty
Posted 8/10/2014 00:09 (#4010707)
Subject: JD 318 garden tractor wont stay running


NCSD
JD 318 garden tractor with onan engine is giving me trouble. Engine starts good and runs good until you engage the clutch to turn on the mower deck. once you hit that switch, engine immediately dies. Tried taking the belt off and that helped. With the belt off, engaging the clutch will make engine sputter for a few mins and eventually die. Battery is new. Power to the coil is a good 13.5 V at all times. Plugs are firing. This acts like a fuel problem as before this clutch thing was happening, when running the engine at high idle for more than about 15 mins it would start running rough and sputtering. I read this has a fuel pump...but im not sure how it works because its not electric or mechanical... it is about the size of a deck of cards and just has like a 3/8 heater hose going to it. Not sure if that's the problem. Any help here is appreciated! I'm awfully green when it comes to small engines.
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abordone
Posted 8/10/2014 00:56 (#4010722 - in reply to #4010707)
Subject: RE: JD 318 garden tractor wont stay running



SW Indiana
Pretty sure that's a vacuum powered diaphragm pump. Could very well be your problem.
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dave morgan
Posted 8/10/2014 01:21 (#4010729 - in reply to #4010722)
Subject: RE: JD 318 garden tractor wont stay running


Somerville, Indiana
we put a 12 V electric fuel pump on Grasshopper that has a Kohler 2 cylinder engine...ONLY down side is not to leave the fuel pump running very long or the crankcase will get gas in it.
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Dutchman
Posted 8/10/2014 04:44 (#4010753 - in reply to #4010707)
Subject: RE: JD 318 garden tractor wont stay running


West Central Illinois
I would say your electric clutch is shorting out.
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olf20
Posted 8/10/2014 06:07 (#4010769 - in reply to #4010753)
Subject: RE: JD 318 garden tractor wont stay running


NW ILLINOIS
If its fuel related pulling the choke out should improve / solve
the problem temporarily.
Clutch should have a fuse on it. It should blow the fuse
before causing engine problems, but never say never.
Also might check the points if it has them. Some had
solid state.
olf20 / Bob


Edited by olf20 8/10/2014 06:08
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johnypop
Posted 8/10/2014 06:59 (#4010803 - in reply to #4010707)
Subject: RE: JD 318 garden tractor wont stay running


ND
Unplug the electric clutch and see if it stays running.
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remington 17
Posted 8/10/2014 08:46 (#4010992 - in reply to #4010707)
Subject: RE: JD 318 garden tractor wont stay running


NW iowa south of the CIty :)
Safety switch in seat will cause that also
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CAZ
Posted 8/10/2014 10:24 (#4011140 - in reply to #4010803)
Subject: RE: JD 318 garden tractor wont stay running


Western New York
I am going bet on the clutch coil breaking down and shorting out.
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schmitty
Posted 8/10/2014 10:27 (#4011150 - in reply to #4010707)
Subject: RE: JD 318 garden tractor wont stay running


NCSD
Choke will not save the engine from dying. No fuse on clutch power circuit. seems like it still wont get fuel even with choke pulled...like that fuel pump is causing a restriction. A short in the clutch would cause the engine to die immediately even with the belt off....not??
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Jon Hagen
Posted 8/10/2014 10:33 (#4011156 - in reply to #4010707)
Subject: RE: JD 318 garden tractor wont stay running



Hagen Brothers farms,Goodrich ND
A buddy told recently of a poor idle problem with his JD 318. Turned out he had an air leak from a plug that had fallen out of the carb or intake manifold. It was a small metal cup plug.
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dirtfarmer3
Posted 8/10/2014 11:33 (#4011237 - in reply to #4010707)
Subject: RE: JD 318 garden tractor wont stay running


NW Ohio
the same thing was happening to me this spring.I finally figured out it was the ground cable off the battery had a loose connection
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srsu99
Posted 8/10/2014 12:27 (#4011304 - in reply to #4011237)
Subject: RE: JD 318 garden tractor wont stay running


Central / West Texas
I amo not sure what model Onan you have, but we have those in several miller engine driven welders. About the only problem we have ever had with them sounds just like your symptoms. It has always been the fuel pump. Which you are right about the description, it s about the size as deck of cards.
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Jon Hagen
Posted 8/10/2014 15:21 (#4011514 - in reply to #4010729)
Subject: RE: JD 318 garden tractor wont stay running



Hagen Brothers farms,Goodrich ND
dave morgan - 8/11/2014 00:21

we put a 12 V electric fuel pump on Grasshopper that has a Kohler 2 cylinder engine...ONLY down side is not to leave the fuel pump running very long or the crankcase will get gas in it.





There are a couple types electric fuel pumps, the standard automotive 7 psi pump and the low pressure 2 psi pumps used on some older foreighn engines and most small engines. The 7 psi pumps pressure is often too much for small engine carbs float and needle, causing them to flood.
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BRIAN
Posted 8/10/2014 17:02 (#4011638 - in reply to #4010707)
Subject: RE: JD 318 garden tractor wont stay running


Graymont Illinois

That sounds like what happened to my 318, fought it for a couple years trying to fix.

I found this  http://www.jimsrepairjimstractors.com/john-deere-318.htm 

 

have to scroll down a ways

Hopefully it links, but this persons 318 starts dies after about 20 minutes, wait till things cool down, it will start and run again for so long then die again.

That's what mine did. Ended up being the control module which requires pulling the motor, taking the rear of it  apart and replacing the module. Solved my problem

Good luck Brian

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Trent2520
Posted 8/10/2014 20:45 (#4012030 - in reply to #4011150)
Subject: RE: JD 318 garden tractor wont stay running



Statesville, NC
A Briggs and Stratton pulse fuel pump will replace most Kohler and Onan pumps, and do the same job, at a MUCH lower cost. Mounting may be a little different. Briggs part number 808656 should be under $30.
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green9530
Posted 8/10/2014 21:51 (#4012198 - in reply to #4011150)
Subject: RE: JD 318 garden tractor wont stay running


ne Iowa
Try it with your gas cap off. If it runs fine your vent is plugged.
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schmitty
Posted 8/28/2014 21:42 (#4044026 - in reply to #4010707)
Subject: RE: JD 318 garden tractor wont stay running-update


NCSD
Well I'm still fighting this issue although the problem changed a bit. Now the engine will start and run great all the way to wide open throttle. When you engage the clutch (belt off), the engine will still run good until about half throttle...then it starts to cut out and run rough as you try to speed it up. Idle it back down and it will run good. I looked into the fuel pump. I took the "out" line off of the fuel pump and cranked the engine over without starting it and gas shot out of there about 18" high. I think the fuel pump is doing its job. What else am I missing?? I read that link to Jims tractors and I am thinking about calling him although my problem doesn't seem exactly the same as the guy posting on his site. Any way to test that control module? Maybe I'm missing something easy.......
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