6. Troubleshooting 6.1. Troubleshooting of fuel injection pump Complete repair means not only replacing defective parts, but finding and eliminating the cause of the trouble as well. The cause of the trouble may not necessarily be in the pump itself, but may be in the engine or the fuel system. If the pump is removed prematurely, the true cause of the trouble may never be known. Before removing the pump from the engine, at least go through the basic check points given here. Basic checkpoints ! Check the injection timings for all cylinders. Are they correctly adjusted? Are they too fast or too slow? ! Check for breaks or oil leaks throughout the fuel system, from the fuel tank to the nozzle.
! Check the nozzle spray. ! Check the fuel delivery. Is it in good condition? Loosen the fuel pipe connection at the injection pump inlet and test operate the fuel feed pump. 6.2. Major faults and troubleshooting 55 Fault Cause Remedy 1. Engine won't start. Fuel not delivered to injection pump. (1) No fuel in the fuel tank. Resupply (2) Fuel tank cock is closed. Open (3) Fuel pipe system is clogged. Clean (4) Fuel filter element is clogged. Disassemble and clean, or replace element (5) Air is sucked into the fuel due to defective connections in the piping from the fuel tank to the fuel pump. Repair (6) Fuel feed pump is damaged. Replace (7) Fuel freeze. Replace with a fuel for cold weather.
Fuel delivered to injection pump. (1) Defective connection of control lever and accel. rod of injection pump. Repair or adjust (2) Plunger is worn out or stuck. Repair or replace (3) Delivery valve is stuck. Repair or replace (4) Control rack doesn't move. Repair or replace (5) Injection pump coupling is damaged, or the key is broken. Replace (6) Air sucking. Bleed air. (7) Plunger/Distribution shaft is seized. Replace pump. (8) Tappet is seized. Replace pump. (9) Stop solenoid is damaged. Replace (10) Cold start device is damaged. Replace (11) Low cranking speed. Replace battery. (12) Governor is damaged. Replace (13) Barrel crack Replace pump. (14) Transmission shaft is seized. Gear slip.
Replace