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318 Fuel Problem?


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#1 WHdbJD ONLINE  

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Posted August 21, 2014 - 08:46 PM

My 318 with the onan , revs, then almost dies , then revs up again, over and

over.  Watching the inline fuel filter I can see the fuel enter, then the engine

revs up until there is almost no fuel in the filter, then it almost dies until more

fuel enters the filter.

 

It ran fine previously, this just started today.  Is this a fuel pump problem?

Does this tractor have screens or strainer on the fuel pickup in the tank that

 might be plugged?

 

 



#2 Alc ONLINE  

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Posted August 21, 2014 - 08:56 PM

Mine was having problems too .The fuel lines just kind of closed off , guess the new gas ruined them .If yours are good maybe you could put the suction side  in a gas can to see if the fuel pump will draw from it


Edited by Alc, August 21, 2014 - 08:58 PM.

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#3 JD DANNELS OFFLINE  

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Posted August 21, 2014 - 09:06 PM

Good luck with that one! Spent almost three weeks this summer fighting that this summer.
Yes there is a screened pickup in the tank on the end of the fuel hose. I wound up putting all new fuel lines on mine. FROM THE TANK ALL THE WAY INCLUDING A NEW INLINE FILTER.
I decided the fuel lines mmay have collapsed internally?
That did not fix it. I thought it was an ignition problem so pulled the engine and replaced the ignition trigger and electronic box.
Then I found that the fuel control valve spool had turned inside the valve and it only passed fuel on the reserve side.
Running it on reserve has solved my problem. I SHOULD BUY A NEW VALVE.
Another thing to check is those little holes around the throat of the carburetor will get plugged and it will surge.
If you take a fine wire and clean them it will correct the surge.
ANOTHER THING TO CHECK IS CORRECT SETTING OF THE THROTTLE CABLE.

Edited by JD DANNELS, August 21, 2014 - 09:10 PM.

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#4 WHdbJD ONLINE  

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Posted August 22, 2014 - 07:02 AM

Thanks , JD and Alc , for the suggestions. 

I put new fuel lines from the tank to the carb  this spring.

 Didn't know then that there is a screen on the pickup inside the tank.

 I'm going to change the inline filter again and check the other items

you mentioned.

I'll let you know what I find! 

 

 

 

 

 

 



#5 Alc ONLINE  

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Posted August 22, 2014 - 08:04 AM

Since you replaced the lines back to the tank does it make any difference when you switch to reserve ?  I've never looked into my tank , could there be a line cracked in there letting it suck air ?  I guess if your brave you could add a length of fuel line and suck with your mouth to see how easy it comes out from the tank , don't get fuel in your mouth it doesn't taste too good lol  



#6 13jac1316 OFFLINE  

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Posted August 22, 2014 - 08:27 AM

Did you try cleaning the carbie it sounds like the governor is sticking




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