FUEL SYSTEM
6-6
BY Service Manual
Introduction
INTRODUCTION
This section of the Service Manual describes the procedures necessary to remove, install, and repair fuel
system components as used on the Yanmar 4BY and 6BY engines.
SPECIFICATIONS
Test and Adjustment Specifications
Inspection Item Specification Reference Page
High-Pressure Fuel
Pump Pressure
Minimum at cranking 250 bar (3625 psi)
-Minimum at low idle 400 bar (5800 psi)
Maximum at 4000 rpm 1600 bar (23,200 psi)
Fuel Feed Pump
Pressure (Minimum)
All speeds 5.0 bar (73 psi)
See Measuring Fuel
Feed Pump Pressure
on page 6-11
Return Fuel Pressure
(Maximum)
All speeds 200 mmAq (7.87 in.Aq)
See Testing Return
Fuel Pressure on
page 6-12
Fuel Supply Restriction
(Maximum)
All speeds 0.1 bar (40 in.Aq) -
Fuel Temperature Maximum before speed reduction begins 80°C (176°F) -
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