Yanmar 6BY2 - Tests and Adjustments; Measure Fuel Feed Pump Pressure

FUEL SYSTEM
Tests and Adjustments
12/05
BY Service Manual
6-9
© 2009 Yanmar Marine International
TESTS AND ADJUSTMENTS
After completing work that involves opening the fuel
system, do the following:
• Bleed the fuel system. See Bleed the Fuel
System on page 6-22.
• Start engine and check for leaks. Allow engine to
run until it is running smoothly.
• Check and delete any trouble codes that are
registered in the ECU after the work has been
completed.
Measure Fuel Feed Pump Pressure
Procedure
1. Assemble a suitable fuel pressure gauge
(Figure 6-5, (1)) to a tee, and connect a short
length of hose (Figure 6-5, (3)) to one of the
remaining two legs of the tee (Figure 6-5, (2)).
Figure 6-5
Figure 6-5
2. Disconnect the fuel line from the fuel feed pump
outlet (Figure 6-6, (1)).
Figure 6-6
Figure 6-6
3. Connect fuel pressure gauge assembly
between disconnected ends. Install and tighten
hose clamps.
4. Start engine and set speed to low idle. Read
and record pressure.
5. Operate engine at full load. Read and record
pressure.
6. Repeat the procedure on the fuel outlet side of
the fuel fine filter (Figure 6-6, (2)).
Specification
(1)
0006655
(2)
(3)
Inspection Item RPM Specification
Fuel Feed Pump
Pressure
(Minimum)
All 5.0 bar (73.0 psi)
0006656
(1)
(2)