ISM, ISMe, and QSM11 – 005-016   Fuel Pump

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

Disconnect the battery cables. Disconnect 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.

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, mounting gasket, and fuel pump.

Install the four 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.

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

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 can not 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 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.

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