M11 Series – Service Manual – 005-016   Fuel Pump

Disconnect the battery cables, negative (-) cable first.

Clean the supply pump and the surrounding area.

Remove the electric wire to the fuel shutoff solenoid.

Remove the fuel plumbing.

Remove the two support bracket capscrews from the cylinder block bracket.

Remove the four fuel pump mounting capscrews and remove the fuel pump.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

Disconnect the negative and positive battery cables, in that order.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

Clean the fuel pump and the surrounding area before removing it from the engine.

Remove the wire from the fuel shutoff valve.

Remove the linkage from the throttle lever.

Remove the fuel tubing and air tube:

• Fuel drain line from the T-block connection (1)
• Gear pump cooling drain (2)
• Gear pump suction line (3)
• Fuel supply to the injectors (4)
• AFC air supply tube (5)
• Tachometer cable (if used) (6)

Remove the two fuel pump support-bracket-to-cylinder-block-bracket mounting capscrews.

Remove the four fuel pump mounting capscrews and the fuel pump.

Remove the drive coupling.

Clean the gasket surfaces of the fuel pump and the air compressor or accessory drive.

Inspect the mounting surfaces for damage.

Inspect the jaw coupling spider and the jaw coupling hub for damage or wear.

Install the jaw coupling spider, the mounting gasket, and the fuel pump.

Install the two outside mounting capscrews.

Install the two fuel pump support brackets to cylinder block bracket capscrews.

Tighten the support bracket to engine mounting capscrews.

Tighten the fuel pump mounting capscrews.

Connect the fuel plumbing.

Connect the electric wire to the shutoff solenoid.

Connect the battery cables.

Start the engine and check for leaks.

Install the fuel pump drive coupling.

Use a new gasket when installing the fuel pump.

Install the four 12-point fuel pump mounting capscrews.

Install the two fuel pump support bracket capscrews to the cylinder block bracket. Tighten the four fuel pump mounting capscrews.

Tighten the two support-bracket-to-cylinder-block capscrews.

Install the AFC air tube and fuel tubing:

• Fuel drain from the T-block connection (1)
• Gear pump cooling drain (2)
• Gear pump suction line (3)
• Fuel supply to the injectors (4)
• AFC air supply tube (5)
• Tachometer cable (if used) (6).

Install the linkage to the throttle lever.

Install the electric wire to the fuel shutoff valve. The wire connection nut must be clean and tight.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

Install the battery cables.

To reduce engine cranking time, prime the fuel supply pump.

NOTE: If the fuel supply pump is dirty, clean the outside of the pump.

Remove the filter cap from the top of the front support.

Fill the pump with clean fuel oil.

Install and tighten the filter cap.

If the filter cap opening cannot be used, remove the fuel supply hose to the gear pump.

Fill the pump with clean fuel.

Install the fuel supply hose to the gear pump.

Remove the plug from the top of the housing.

Fill the housing with clean fuel oil.

Install the plug into the top of the housing.

If the priming plug is hard to remove or the fuel pump is a VS type, remove the fuel supply hose to the gear pump.

Fill the hose and gear pump with clean fuel.

Install the fuel supply hose to the filter head.

Remove the fuel supply hose and the fuel inlet fitting from the gear pump.

Look into the gear pump and crank the engine. The gear pump gears must turn.

If the supply pump gears do not turn, remove the fuel pump.

Crank the engine, and check the air compressor or the accessory drive shaft for rotation.

If the shaft turns, the fuel pump is damaged and must be replaced or repaired. Refer to the M11 Shop Manual, Bulletin 3666075 for rebuilding instructions.

If the shaft does not turn, remove the air compressor, and check the accessory drive for rotation. If the accessory driveshaft turns, the air compressor or air compressor coupling is damaged and must be replaced.