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Tractor Talk Discussion Forum

Briggs Vanguard Surging

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TimWafer

07-12-2018 11:17:44




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I have a 18HP Briggs vanguard #350447 in a UTV that surges at higher throttle or under load. Ive removed disassembled and cleaned the carb by soaking in carb cleaner, blowing it out with compressed air and putting it in an ultrasonic cleaner. Also using aerosol carb cleaner.

Ive replaced the fuel filter (& air filter) but the same issue remains. Adding a little choke to it while it does this seems to help. Its driving me nuts. It just seems like its starving for fuel. I was thinking of trying a temporary fuel tank above the motor so its gravity fed and see if that makes a difference. That would eliminate the fuel pump.

Any other ideas?

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TerryB Illinois

07-13-2018 20:57:01




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 Re: Briggs Vanguard Surging in reply to TimWafer, 07-12-2018 11:17:44  
Go to you tube and search for Steve's Small Engine Saloon. Go to videos and I think it is the second one that says how do I fix a surging engine. I had one surging and tried what he shows and it fixed the surging. Good luck.



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TerryB Illinois

07-13-2018 20:55:32




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 Re: Briggs Vanguard Surging in reply to TimWafer, 07-12-2018 11:17:44  
Go to you tube and search for Steve's Small Engine Saloon. Go to videos and I think it is the second one that says how do I fix a surging engine. I had one surging and tried what he shows and it fixed the surging. Good luck.[/url]



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TimWafer

07-13-2018 06:27:16




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 Re: Briggs Vanguard Surging in reply to TimWafer, 07-12-2018 11:17:44  
This is a twin cylinder 18hp Vanguard horizontal shaft. yes it has a pulse type pump. Thats why I thought running a gravity feed tank to test it might be a good idea.
I will have to look again to see the brand of carb and check that spring.

Thanks



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Janicholson

07-12-2018 20:28:42




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 Re: Briggs Vanguard Surging in reply to TimWafer, 07-12-2018 11:17:44  
I have had that experience (my own and neighbors) my end game was to drill out the main jet with number drills. I used a drill that "just" fit the hole, then used the next size larger to enlarge the hole a tiny amount. In some cases it requires 2 sizes to level out the mixture. Jim



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Tim S

07-12-2018 17:44:56




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 Re: Briggs Vanguard Surging in reply to TimWafer, 07-12-2018 11:17:44  
A little water in the float bowl will cause that too, some bowls have a drain in them..



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ss55

07-12-2018 14:59:13




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 Re: Briggs Vanguard Surging in reply to TimWafer, 07-12-2018 11:17:44  
Restriction in the idle circuit? Does adjusting the idle screw make any difference or the adjustment screw capped?



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RLP in Co.

07-12-2018 14:36:10




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 Re: Briggs Vanguard Surging in reply to TimWafer, 07-12-2018 11:17:44  
I had an engine do that too. There is a chamber that can plug up and you have to remove a plug to clean it. I sharpened an old screwdriver to a point to remove the plug and cleaned it out. There is a new plug in the kit. It is a little flat piece of aluminum. This was on a different engine so yours may not be the same. Did you poke a wire in every hole? Just cleaning won't get the job done.



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jeffcat

07-12-2018 13:33:56




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 Re: Briggs Vanguard Surging in reply to TimWafer, 07-12-2018 11:17:44  
First, is this a single or twin cylinder? As forwarded, that little soft spring on the throttle linkage from the govenor must be there and free to move a little. If this is a twin cylinder see if it has a NIKI carb on it. That most likey is your problem. Get back to us so we can do further diagnosis.



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old

07-12-2018 11:50:00




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 Re: Briggs Vanguard Surging in reply to TimWafer, 07-12-2018 11:17:44  
As Guido say and or you could have a weak spring in the linkage which will also cause that



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Guido

07-12-2018 11:37:41




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 Re: Briggs Vanguard Surging in reply to TimWafer, 07-12-2018 11:17:44  
Hello Tim Wafer,

Look at the gas cap. It has a vent hole. Make sure it is not blocked. I am leaning towards the carb though. Usually the idle jet gets clogged and the engine will surge. Either way it is a fuel delivery issue,

Guido.



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ken combs

07-12-2018 14:45:03




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 Re: Briggs Vanguard Surging in reply to Guido, 07-12-2018 11:37:41  
Yep, sure sounds like fuel. Does it have the pulse pump? They are known to fail and/or the line to the crankcase from the pump can be leaking, so weak pulse/low fuel delivery



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