Yanmar 4BY - Fuel System

BY Service Manual
6-1
BY Service Manual
Section 6
FUEL SYSTEM
Page
Before You Begin Servicing ............................................................ 6-3
Introduction...................................................................................... 6-6
Specifications .................................................................................. 6-6
Test and Adjustment Specifications .......................................... 6-6
Special Torque Chart................................................................. 6-7
Special Service Tools...................................................................... 6-8
Fuel System Components............................................................... 6-9
4BY Engines.............................................................................. 6-9
6BY Engines.............................................................................. 6-9
Fuel Flow Diagram ........................................................................ 6-10
Tests and Adjustments.................................................................. 6-11
Measuring Fuel Feed Pump Pressure..................................... 6-11
Testing Return Fuel Pressure.................................................. 6-12
Repair............................................................................................ 6-13
Removal of Fuel Injector.......................................................... 6-13
Cleaning Fuel Injector Cavities................................................ 6-14
Installation of Fuel Injector....................................................... 6-16
Removing and Installing High-Pressure Fuel Lines................. 6-17
Replacing the Fuel Feed Pump............................................... 6-19
Replacing High-Pressure Fuel Pump ...................................... 6-20
Replacing Fuel Filters.............................................................. 6-24
Removing and Installing Fuel Rail........................................... 6-27
Replacing Injector Return Fuel Line ........................................ 6-28
Bleeding the Fuel System........................................................ 6-29