Mercury BW1Z-9H307-A Sender And Pump Assembly

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First of all, to perform a fuel pressure test, you will need a gauge and adaptor set. The fuel pump operates when the engine is cranking or running and shuts off without ignition pulses. After relieving pressure, cover fuel connections with a towel. To inspect the fuel system, listen for a whirring sound at the fuel filler opening when turning the ignition on, if absent, check the fuse, relay, and circuitry. For older models, attach a gauge to the test port and check pressure with and without the engine running. For newer models use a tee-in gauge to measure pressure between hose and rail. After each test, depressurize the system and reconnect components.

Siphon any remaining fuel from the tank and relieve the fuel pressure.

Listen for a whirring sound at the fuel filler opening when turning the ignition to the On position.

Discard the old O-ring seal.