3500 4x2 Pickup L6-359 5.9L DSL Turbo (1994)
Performing Volume Test
2. Connect a temporary rubber fuel hose at the top (output) side of the fuel transfer pump.
3. Place the other end of this hose into a graduated container.
4. Crank the engine for 30 seconds. Measure the fuel volume in the container after 30 seconds of engine cranking time. Do not crank the engine for
more than 30 seconds at a time. Starter motor damage may result.
Fuel Volume Specifications
5. To determine the correct fuel volume, refer to Fuel Volume Specification chart while referring to the following procedure:
a. Draw a straight vertical line at the measured RPM.
b. Draw a straight horizontal line at the measured fuel volume.
c. If these two lines intersect below the flow line, this indicates a defective transfer pump or a line restriction.
d. If these two lines intersect above the flow line, this indicates acceptable fuel flow.
6. If fuel volume falls below specifications, test for fuel line inlet restrictions before condemning the fuel transfer pump. This is done by installing a
T-fitting between the disconnected fitting and the transfer pump inlet.
