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Why does a Briggs and Stratton 4.5 HP lawn mower engine stop 2 3 seconds after it starts unless you continue to prime it?

A Briggs and Stratton 4.5 HP lawn mower engine might stop 2-3 seconds after it starts if the carburetor bowl is not properly filled with fuel. This can be caused by a faulty fuel line, a clogged fuel filter, a faulty carburetor, or a defective fuel pump.

To fix this issue, you may need to:

- Check the fuel line for any kinks or cracks

- Clean or replace the fuel filter

- Empty and clean the carburetor bowl

- Replace fuel pump if necessary

Once you have fixed the cause of the problem, the engine should start and run normally without requiring constant priming.

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