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Cranks but dies after 2seconds....why

Have cleaned Carb.and tank installed new gasket and diaphragm cleaned plug and put in fresh gas

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Hi Vernon:
It sounds like a fuel delivery problem.
Is there a fuel filter? Could be plugged.
Check that fuel flowing through carb. Drain plug?
When carb serviced, were all small orifices clean out (compressed air?)

Posted on Jul 25, 2015

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Why won't the saw run other than when the choke is in the 1/2 position and dies whenever throttle is applied?


Your carb is starving gas from your saw. You will have to remove the carb. and take it apart, check the diaphragms for hardening or splitting, clean all passages and screen. There is a lot of small parts that have to be put back together correctly, also the diaphragms and their gaskets have to be installed right.

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Working on a Briggs and Stratton 10T502-1457-B1. Runs rough and has black smoke coming from exhaust. This engine has no float to stick so that is not the problem. It does have a fuel primer bulb that works...


if you replaced the diaphragm and gasket below the carb and are completely positive they are installed correctly and not damaged, then the carb is defective and they usually warp or the primer system goes bad

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Primes and begins to start, but then stalls out. Think it's a fuel supply issue. Good on oil and spark plug. Thoughts?


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If this is a horizontal shaft, like a go-kart, all the stuff about plugged pickups and main nozzles applies, only big difference is if there was a lot of corrosion in the bowl under the carb, the main jet could be permanently plugged, also there should be a removable jet on the control lever side of the carb that will probably need cleaning as well, also when removing the carb from the tank make note of any fuel in the bowl, if there isn't any, make sure the pickup tube isn't plugged or split, the diaphragm spring is installed, and the bowl doesn't have a hole rotted through it.

May 30, 2010 | Garden

1 Answer

My Husqvarna 350 chainsaw won't stay running. Changed spark plug and fresh gas. Please help if


Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
Chain Saws:
5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then:
Remove Carburetor
6) replace gaskets/diaphragms
a) use a spray carb cleaner to clean jets, holes, and body of carb
b) fuel pump diaphragm goes against the carb body,
then the gasket towards the outside
c) metering gasket goes against the carb body,
and the diaphragm goes towards the outside

I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae

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1 Answer

Starts but dies after several seconds


Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
Chain Saws:
5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then:
Remove Carburetor
6) replace gaskets/diaphragms
a) use a spray carb cleaner to clean jets, holes, and body of carb
b) fuel pump diaphragm goes against the carb body,
then the gasket towards the outside
c) metering gasket goes against the carb body,
and the diaphragm goes towards the outside

I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae

Nov 21, 2009 | Homelite Garden

1 Answer

It would not crank up so i replaced the filter in the gas tank and seemed to have put it back together right


Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check cylinder compression


Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
Chain Saws:
5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then:
Remove Carburetor
6) replace gaskets/diaphragms
a) use a spray carb cleaner to clean jets, holes, and body of carb
b) fuel pump diaphragm goes against the carb body,
then the gasket towards the outside
c) metering gasket goes against the carb body,
and the diaphragm goes towards the outside


I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae

Nov 14, 2009 | Garden

1 Answer

Yard machine ym26ss straight shaft trimmer. New gas,


Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
Chain Saws:
5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then:
Remove Carburetor
6) replace gaskets/diaphragms
a) use a spray carb cleaner to clean jets, holes, and body of carb
b) fuel pump diaphragm goes against the carb body,
then the gasket towards the outside
c) metering gasket goes against the carb body,
and the diaphragm goes towards the outside

I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae

Nov 12, 2009 | Yard Machines Garden

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