Yanmar 4BY - Tests and Adjustments; Measuring Fuel Feed Pump Pressure

FUEL SYSTEM
BY Service Manual
6-11
Tests and Adjustments
TESTS AND ADJUSTMENTS
IMPORTANT
After completing work that involves opening
the fuel system do the following:
Bleed the system. See Bleeding the Fuel
System on page 6-29.
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.
Measuring Fuel Feed Pump Pressure
Procedure
Figure 6-4
1. Assemble a suitable fuel pressure gauge to a
tee, and connect a short length of hose to one
of the remaining two legs of the tee
(Figure 6-4, (1)).
Figure 6-5
2. Disconnect the fuel hose from the fuel fine filter
inlet (Figure 6-5, (1)).
3. Connect test 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.
CAUTION
• ALWAYS be environmentally
responsible.
• Follow the guidelines of the EPA or
other governmental agencies for the
proper disposal of hazardous
materials such as engine oil, diesel
fuel and engine coolant. Consult the
local authorities or reclamation facility.
• NEVER dispose of hazardous
materials irresponsibly by dumping
them into a sewer, on the ground, or
into ground water or waterways.
• Failure to follow these procedures may
seriously harm the environment.
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