Section 17.10 Fuel Pump

Section 17.10
Fuel Pump

To determine if the fuel pump is causing starting difficulty, perform the following steps:‪

1. Insert a piece of wire through the 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, determine if the drive hub or coupling should be replaced; refer to "17.10.1 Drive Hubs and Coupling Replacement" .
   2. If the wire did vibrate, check for aerated fuel; refer to "17.11 Aerated Fuel" .

Section 17.10.1
Drive Hubs and Coupling Replacement

Perform the following for drive hub or coupling replacement:‪

1. Replace the drive hub or coupling; refer to "2.6 Fuel Pump Drive" . Shut the engine down.
2. Test the engine to determine if starting has been improved; refer to "17.10.1.1 Engine Test with Replaced Drive Hubs or Replaced Coupling" .

Section 17.10.1.1
Engine Test with Replaced Drive Hubs or Replaced Coupling

Perform the following to determine if replaced drive hubs or coupling resolved starting difficulty: ‪

1. Attempt to start and run the engine.
   1. If the engine starts and runs, no further troubleshooting is required.
   2. If the engine fails to start and run, check for air in fuel; refer to "17.11 Aerated Fuel" .