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OM-2032 / Operation and Maintenance Manual
100D20 / Generator Sets
(1) Disconnect the fuel return tube at, or near, the tank. Hold the open end in a convenient
container of over 1-gallon capacity.
(2) Start and run the engine at governed speed 2000 RPM. Measure the fuel flow from the return
tube for 1 minute. Flow should be 0.8 gallon (based on 0.080 restriction). If fuel flow is below
this amount, it indicates that the fuel strainer, fuel filter or fuel pump requires servicing or repair.
(3) To check suction side of the pump, immerse the end of the return tube in a container of fuel. If
air bubbles rise to the surface of the fuel, it indicates that air is being drawn into the fuel system
on the suction side of the pump. If air is present, tighten all fuel connections between the fuel
tank and the fuel pump. Check for defective tubes, hoses, etc.
10. Illustrations
Illustrations, Figures 1 through 8, are referred to throughout the Trouble Shooting Chart
March 28/94 Revised
Chapter 3-1
Page 5
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