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SERVICE BULLETIN
DATE:
April 13, 1985
BULLETIN NUMBER: 153
MODEL:
All Current Production propulsion and Generator Models
SUBJECT:
Check valves and Fuel Pick-up Screens
1.
Fuel starvation problems have occurred, resulting from the
installer placing a check valve in the fuel supply line to the
engine.
Check valves can restrict the engine mounted fuel pump's
ability to draw fuel from the fuel tank through the check valve
and any in-line filters to the engine.
This results in air being
drawn into the system, causing loss of engine power and/or engine
stoppage.
Check valves should not be installed in the fuel supply line to
the engine.
2.
Fuel tank pick-up tubes have been found to randomly have fine
gauze screens installed in them by the tank manufacturer.
These
gauze screens can clog from debris in the fuel and stop fuel flow
from the tank, resulting in loss of engine power and/or engine
stoppage.
If a fuel starvation problem is encountered, check fuel supply to
the engine from the fuel tank and examine the pick-up tube for the
presence of a gauze screen and, if present, remove it.
Gauze type
screens should not be installed in fuel tank pick-up tubes.
Fuel
filtering must be accomplished by the serviceable fuel filters/
separators between the fuel tank and engine as well as by the
filters in the engine mounted fuel system.
NOTE:
Monitoring return fuel can give an indication
of supply restriction and/or air.
Return fuel should be free of air.
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