1. Plunger-type fuel pump: A high-pressure pump used in marine diesel engines to deliver precise fuel quantities to injectors.

2. Gear-type fuel pump: A rotary pump that transfers fuel at lower pressures, often used for fuel supply and circulation.

3. Distributor-type fuel pump: An electronically or mechanically controlled pump that distributes fuel to individual cylinders in sequence.

Types of Fuel Pump in Marine Diesel Engine:

1. Plunger-Type Fuel Pump: Size: 50-200 mm; Grade: High-pressure; Viscosity: 5-700 cSt; Material: Stainless steel/carbon steel.

2. Gear-Type Fuel Pump: Size: 30-150 mm; Grade: Medium-pressure; Viscosity: 10-500 cSt; Material: Cast iron/bronze.

3. Rotary Vane Fuel Pump: Size: 40-180 mm; Grade: Low to medium-pressure; Viscosity: 20-400 cSt; Material: Aluminum alloy/stainless steel.

4. Centrifugal Fuel Pump: Size: 60-250 mm; Grade: Low-pressure; Viscosity: 1-100 cSt; Material: Cast iron/stainless steel.

Marine Pumps:

1. Bilge Pump: Size: 50-300 mm; Buoyancy: N/A; Material: Bronze/stainless steel.

2. Ballast Pump: Size: 100-500 mm; Buoyancy: Adjustable; Material: Cast iron/stainless steel.

3. Fire-Fighting Pump: Size: 80-400 mm; Buoyancy: N/A; Material: Bronze/cast iron.

4. Cooling Water Pump: Size: 60-350 mm; Buoyancy: N/A; Material: Bronze/stainless steel.

5. Fuel Transfer Pump: Size: 50-200 mm; Buoyancy: N/A; Material: Stainless steel/carbon steel.