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318 issues

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#1 abrasv OFFLINE  

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Posted August 24, 2015 - 05:03 PM

Had some problem past weekend with the Onan B43G engine surging and eventually a few back fires and died. Cleaned and re-gapped the points at 16 and cleaned and tightened up the carb. Ran good after that so mowed today and after about an hour it started doing the same thing. It starts and runs with the choke out but even then it surges. I did install an electric fuel pump last year but have never had an issue with that so I think I can rule that out.

Can anyone offer any ideas/suggestions as to what to look at next?




#2 propane1 ONLINE  

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Posted August 24, 2015 - 05:15 PM

Plugged gas cap, ?? Noel
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#3 boyscout862 OFFLINE  

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Posted August 24, 2015 - 07:23 PM

Fuel filter plugged? A fuel line may be collapsing or partially plugged. It could be something in the gas. Check propane1's suggestion first. Good Luck, Rick

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#4 grattone OFFLINE  

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Posted August 24, 2015 - 07:52 PM

Check gas tank for trash, last week I had a push mower doing that and it was trash in the tank. It was being pulled to the line and blocking the outlet. 

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#5 abrasv OFFLINE  

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Posted August 28, 2015 - 05:08 PM

Here's an update: replaced the plugs, points, condenser, plug wires, and fuel filter. Started it right up and mowed for about a half hour. I'm thinking what a great mechanic I am so as I am heading to the shop I cut back on the throttle to about half-throttle and it starts surging again along with a few back fires. So much for my mechanic-ing at this point
As long as it is full throttle it seems to run ok.
Heading out now to attack the fuel lines and see what needs replaced there.

#6 Jehtro OFFLINE  



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Posted August 31, 2015 - 10:36 AM

My 318 did that last winter with snow in the drive to be cleared,


Ended up flipping the pickup from main to reserve and it cleared, added additional fuel filter base of Carb . 


I suspect the ethanol in the fuel is eating the lines from the inside, or the screen on the main pickup is clogged in the tank.


Planning on putting new lines on and checking the tank pickup screen.


Its still working on the reserve pickup and to be honest I kinda forgot about it until I read this post.

#7 abrasv OFFLINE  

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Posted August 31, 2015 - 06:23 PM

Changed all the fuel lines and cleaned the small filters in the tank. No trash in the tank but the lines looked like they were original so they may have deteriorated on the inside. I did not cut open the fuel filter to see if it had partially plugged but did blow thru it and it seemed clear.

Reset the points to 16 and it has been running well so far.