GASKET 2A4554 - Caterpillar

Do not allow dirt to enter the fuel system. Thoroughly clean the area around a fuel system component that will be disconnected. Fit a suitable cover over disconnected fuel system component.
Key-on Priming (if equipped)
Turn the engine start switch to the ON position. Leave the engine start switch in the ON position for 2 minutes.
Verify that the water separator is full of fuel.
If the water separator is not full of fuel, turn the engine start switch OFF and then turn the engine start switch ON. Turning the switch OFF, then ON will cycle the fuel priming pump again.
When the water separator is full of fuel, attempt to start the engine. If the engine starts and the engine runs rough or the engine misfires, operate at low idle until the engine is running smoothly. If the engine cannot be started, or if the engine continues to misfire or smoke, repeat Step 1. Manual Switch Priming (if equipped)
The manual switch is located on the primary filter base/electric priming pump assembly.
Hold the manual switch in the up position until fuel has filled the water separator.
Continue to hold the switch for 30 seconds after the water separator is full.
Attempt to start the engine. If engine starts and runs rough or misfires, operate at low idle until the engine is running smoothly. If the engine cannot be started, continue to prime the fuel system for 30 more seconds.