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Last updated October 28, 2026 · Applies to: generators from Honda, Briggs & Stratton and Kohler
Cause 1: Stale fuel or gummed carburetor
Step-by-step instructions for this cause are being written.
Inside a float-bowl carburetor. Varnish from old fuel usually blocks the main jet or emulsion tube first.
Cause 2: Low-oil shutdown
Step-by-step instructions for this cause are being written.
Engine oil system (splash-lubricated). Too much oil can be pushed into the breather and burned; too little seizes the engine.
Cause 3: Fuel valve or tank vent closed
Step-by-step instructions for this cause are being written.
Fuel path: tank to cylinder. Fuel must flow through every stage. A blockage at any box starves the engine.
Cause 4: Choke position
Step-by-step instructions for this cause are being written.
Primer and choke circuit. A cracked primer bulb pushes air, not fuel. The choke must open once the engine fires.
Cause 5: Fouled spark plug
Step-by-step instructions for this cause are being written.
Ignition path: magnet to spark. Test the end of the chain first: a spark tester on the plug lead.
Cause 6: Dead starter battery (electric start)
Step-by-step instructions for this cause are being written.
Electric-start circuit. Work from the battery outward with a multimeter: 12.6 V at rest is a charged battery.
Which cause is it?
The decision table is being compiled from shop pricing and manufacturer data.
Brand notes
Brand-specific notes for Honda, Briggs & Stratton and Kohler are being researched.
When to take it to a shop
Hand it over if the engine still will not run after the fuel, spark and air checks, if you find metal in the oil or the
engine is seized, or if the machine is under warranty (opening it yourself can void it).
Find a generator repair shop near you
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Answers being written: Why won't my generator start after storage? · Does low oil stop a generator from starting? · How do I clean a generator carburetor? · How often should I run my generator?