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My 1997 Sunstar starts every time I turn the key. BUT then it stops like shutting the switch off within 3-4 seconds. Help!

http://bsintek.basco.com/BriggsDocumentDisplay/jgEDGP_ctP8tG6EPi7mRgtLvBCd6.pdf

http://bsintek.basco.com/BriggsDocumentDisplay/jgEAGP_cuJ4tG6EPi7mRgtLvBCd6.pdf

Post your model number example: 1692454

Replace fuel filter, air filter, spark plugs & check oil level on dipstick and if gas is in oil by checking dipstick.

mechanic mark said:

http://bsintek.basco.com/BriggsDocumentDisplay/jgEDGP_ctP8tG6EPi7mRgtLvBCd6.pdf

http://bsintek.basco.com/BriggsDocumentDisplay/jgEAGP_cuJ4tG6EPi7mRgtLvBCd6.pdf

Post your model number example: 1692454

Replace fuel filter, air filter, spark plugs & check oil level on dipstick and if gas is in oil by checking dipstick.

Click to expand...

Model 1692454
20 hp Kohler Command
replaced fuel & air filters
oil level full and clean
no gas in oil
starts with no hesitation then stalls within 4 seconds. Every time.

jcj54 said:

Model 1692454
20 hp Kohler Command
replaced fuel & air filters
oil level full and clean
no gas in oil
starts with no hesitation then stalls within 4 seconds. Every time.

Click to expand...

Lawn Tractor Manuals | Riding Mower Manual | Simplicity Mowers Manual shows 20 h.p. being B&S Vanguard & 18 h.p. Kohler Command. Either way you need to adjust valves to specs. Post all numbers from engine. Check neutral detent w/safety start switch.

Lawn Mower Parts, Small Engine Parts & Much More! | PartsTree.com - Briggs, MTD, Toro, Cub Cadet, Husqvarna, Troy-bilt...

jcj54 said:

Model 1692454
20 hp Kohler Command
replaced fuel & air filters
oil level full and clean
no gas in oil
starts with no hesitation then stalls within 4 seconds. Every time.

Click to expand...

http://bsintek.basco.com/BriggsDocumentDisplay/default.aspx?filename=khFHHQ.erN2uH6FSm8nSiW.tfnq5Y wiring diagrams for your tractor pages 2-5

Thanks for wiring diagrams.
Engine was replaced with Kohler by previous owner. No start/run problems until now, 5 years later.

Yeah? Kohler numbers????

jcj54 said:

Thanks for wiring diagrams.
Engine was replaced with Kohler by previous owner. No start/run problems until now, 5 years later.

Click to expand...

check circuit breaker, wires grounding out from electrical harness, or defective safety switch, use hands on approach & take your time.

let us know what you find please.

Found that fuel solenoid isonly energized during cranking. Is not energized in run position of ignition switch. Safety switches all made and energized. Don't know where to look.

jcj54 said:

Found that fuel solenoid isonly energized during cranking. Is not energized in run position of ignition switch. Safety switches all made and energized. Don't know where to look.

Click to expand...

Have you inspected spark plugs recently for replacement?

http://www.kohlerengines.com/onlinecatalog/pdf/24_690_02_EN.pdf page 18, engine starts but does not keep running.

Spark plugs fine.
Put jumper from positive battery to fuel solenoid.
Now it stays running when ignition switch released from start to run position. Will put toggle switch in jumper so battery does not drain when not being run.
At least I can mow untul I find root cause.