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.

Discard the old O-ring seal.

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.