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18hp briggs will not start, fuel related

Just rebuilt carb, fuel adjustment seems to be off. if i take the fuel line off at carb, will start.

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Sounds like you may be getting too much fuel - when you rebuilt carb did you check the float ( by shaking it near your ear ) to see if it was full of fuel . if it is throw it away and get another - if not need more info like what did you adjust the jets to

Posted on Oct 17, 2008

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check your gas cap first
then next time it stalls, have a spare spark plug in your pocket and check for spark so you cab rule it out and the suspect a carb or fuel delivery issue... fuel lines can be an issue... there are some numbers on that engine. either on one of those valve covers or on top or side of the fan shroud ( the top cover ) we need those next time

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Craftman lawnmower model 917.270740, I RELACED THE HEAD GASKET AND RESET THE VALVES. IT ALSO HAS NEW AIR FILTER AND FUEL FILTER AND CHANGED THE OIL. MOTOR WILL START ONLY WHEN THE CHOKE IS FULLY ENGAGED....


I am not sure exactly WHAT problem you are stating, but by what you say, it is a fuel problem. The battery problem is of course another matter. If, after installing new fuel filter, fuel does NOT flow thru the carb, there possibly is too much air in the system, creating a sort of vapor lock. Pull the fuel line of of the inlet to the carb to allow air to escape and fuel to take it's place. I have had this same problem after replacing a fuel filter. Properly adjusted valves allow the built-in ACR (automatic compression release) function to operate. When the ACR system is NOT working properly, starting is hard and the results mimic a weak battery. When starting the engine it will come UP on the compression stroke and stop. Try turning the engine backward (counterclockwise) by hand by grasping the flywheel screen cover. Afterwards, then try starting it. Make sure you are using a fully charged battery (at least 12+ volts). Post back please.
Did you adjust the valve clearance with the piston 1/4" below TDC on compression stroke (if Briggs engine). Sears states you have the 311707 model Briggs engine. Post back if I can be of more help.

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After about 30 minutes engine will start surging, by partly pulling the choke out it will run better. The carb has been recently rebuilt as well as new filter and fuel line to carb. Tried different fuel...


Typically a surge is caused by a lean condition. I'd say the float is set to low and this is causing the engine to lean out & when you apply the choke it richens it back up.and the surge stops.

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no sounds like your carb needs a real good babtising! good look!

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We're talking about a briggs or kohler motor with a bowl type carb- correct? Im assuming you are sure you are dealing with a fuel issue.

To what extent did you rebuild the carb? Did you replace the needle? Make sure all passages are clear? check the float level? Check the setting of the idle air screw ( if present)?

Did you check the quality of fuel coming out of the fuel line and did it have good flow? Its easy to have water in your fuel system and inadvertantly fill your clean rebuilt carb up with water/ bad fuel.

In short, once you've narrowed it down to a fuel issue, youve either missed something in the carb and will need to go through it again or there is bad fuel in your system or the fuel is not reaching the carb.

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some briggs motors are hooked wrong straight from the factory, where the throttle linkage is concerned. ( and the little spring is pretty hokey too)

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Hi
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I suspect a fuel problem.

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