Mercury F1PY-9A407-A Fuel Pump Assembly

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The fuel pump is located on the left side of the engine, on the timing chain cover. Place rags under the fuel pump to catch any spilled gasoline. Carefully unscrew the fuel line fittings and detach the lines from the pump using a flare-nut wrench and a back-up wrench on the pressure-side fitting. Unbolt and remove the fuel pump. Before installation, coat both sides of the gasket surface with RTV sealant, position the gasket and fuel pump against the block, and install the bolts securely. Attach the lines to the pump and tighten the pressure fitting securely using a flare-nut wrench. Use a new hose clamp on the fuel hose. Run the engine and check for leaks.

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

Use a new O-ring seal with a thin coat of heavy grease for installation.

A potential issue could be a ruptured fuel pump diaphragm, which can cause fuel to leak into the crankcase.

Start the engine and check for fuel leaks.

Check the fuel pump fuse, relay, and related circuitry.

Reinstall the pump assembly in reverse, applying grease to the new seal ring for assembly.

Various troubleshooting steps are taken for high or low pressure.