The 1991 Mercruiser 4.3 fuel pump is a marine-specific mechanical pump designed for V6 engines.

It delivers fuel from the tank to the carburetor at the required pressure for optimal performance.

Built to withstand harsh marine conditions, it ensures reliable operation in boating environments.

The 1991 Mercruiser 4.3 fuel pump is a mechanical diaphragm-type pump with the following specifications:

Size: Approximately 4.5 inches in diameter and 3 inches in height.

Grade: Designed for marine use, compatible with gasoline engines.

Viscosity: Works with fuels ranging from 87 to 93 octane, no specific viscosity rating for the pump itself.

Buoyancy: Not applicable (non-floating component).

Material: Housing typically made of cast aluminum or steel, with a nitrile or Viton diaphragm for fuel resistance.

Pressure Rating: Delivers 4-6 psi fuel pressure.

Inlet/Outlet Size: 3/8-inch NPT fittings.

Compatibility: Designed for Mercruiser 4.3L V6 engines (1991 model year).