Series 50 – Section 23.2 Defective Fuel Pump

Section 23.2
Defective Fuel Pump

To determine if the fuel pump is causing excessive white smoke, perform the following steps:‪

1. Insert a piece of wire through the fuel pump flange drain hole; see Figure "Fuel Pump Flange Drain Hole Location" .
   

   Figure 1. Fuel Pump Flange Drain Hole Location

2. Crank the engine momentarily and feel for wire vibration.
   1. If the wire did not vibrate; refer to "23.2.1 Drive Hubs and Coupling Replacement" .
   2. If the wire did vibrate, check for aerated fuel; refer to "23.3 Aerated Fuel" .

Section 23.2.1
Drive Hubs and Coupling Replacement

Perform the following for drive hubs or coupling replacement:‪

1. Replace the drive hubs or coupling; refer to "2.6 Fuel Pump Drive" .
2. Verify the drive hubs and coupling replacement; refer to "23.2.1.1 Engine Test with Replaced Drive Hubs or Replaced Coupling" .

Section 23.2.1.1
Engine Test with Replaced Drive Hubs or Replaced Coupling

Perform the following to determine if replaced drive hubs and coupling resolved excessive white smoke: ‪

1. Start and run the engine.
2. Run the engine at idle with a no-load for approximately 5 minutes, allowing the engine coolant to reach normal operating range.
3. Visually inspect exhaust for excessive white smoke.
   1. If the engine exhaust emission appears normal, no further troubleshooting is required. Shut the engine down.
   2. If the engine exhaust emission is excessively white, shut the engine down. Check for aerated fuel; refer to "23.3 Aerated Fuel" .