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Fuel lines carry fuel from the tank to the outboard, the primer bulb pumps it up by hand before starting, and a filter catches dirt and water before it gets to the engine. Old fuel lines break up inside and block the flow, and a clear filter bowl is the best way to see it happening.

PHOTO Dangar Marine Outboard Guide

Installing a water separating fuel filter

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A large external fuel filter with a clear bowl protects the engine from dirt and water in the fuel.

The fuel lines have perished inside

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Ethanol and UV break fuel lines down from the inside, and the pieces block the fuel flow.

The fuel primer bulb

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The primer bulb is a manual hand pump to fill the carburettor bowl before attempting to start the engine.