Bleeding The Fuel System - Westerbeke 6.5 MCG Service Manual

BLEEDING THE FUEL SYSTEM
DESCRIPTION
1. Disconnect the fuel module from the engine wiring
harness.
2. Attach your fuel pressure gauge set (Snap On #MT337B,
OTC 7211) or equivalent to the Schrader valve on the fuel
module. Direct the bleed hose from the pressure gauge
into a proper container.
3.
Open the bleed valve on the pressure gauge, Depress the
STOP
switch and hold it depressed. This activates the low
pressure fuel pump. Observe the fuel flow through the
bleed hose and when no air bubbles are seen, close the
bleed valve and observe the fuel pressure. Typically about
3-5 psi
4. Remove the pressue gauge from the fuel module and
connect it to the Schrader valve on the fuel rail.
5. Re-connect the fuel module to the engine harness.
VAlVE
"SNAP-ON· TOOL" PROVIDES AN
EXCELLENT PRESSURE GAUGE KIT
FOR PRESSURE TESTING AND
BLEEDING SCHRADER TEST PORTS
COOlANT DRAIN
44
6. Open the bleed valve on the fuel pressure gauge. Depress
the
STOP
switch and hold it depressed. This activates
both the low pressure and high pressure fuel pumps.
Observe the fuel flow through the bleed hose and when no
air bubbles are seen, close the bleed valve and observe the
fuel pressure. The pressure should be in the 40 psi range.
7. Remove the pressure gauge set and replace the caps on
the two Schrader valves.
8. Insure that all harness connections are secure, operate the
generator and check that there are no fuel leaks.
NOTE:
The fuel system will need to be bled any time the fuel
filters are serviced.
A
WARNING:
The fuel is under extreme pressure!
No smoking and no open flames! Clean up spilled fuel
and properly discard of cloths and towels.
f
I
~--~----.,~
_....--- I
---;.~
FUEL
it
l
RAIL
l
i
FROM HIGH
PRESSURE
PUMPMOOULE
_.~,:--
I
t
!
I
I
I
)