Form 824262
Page Number - 9
Setup and Installation
Determining Where to Install the FST
Inline Connection
Regardless of the type of fuel delivery system, the FST Pro is most ef-
fective at diagnosing malfunctions when connected inline with the flow
of fuel. The initial installation should be made at an access point along
the fuel supply line, as close as possible to the fuel rail (Figs. 5, 6 and
7). At this location, the fuel pressure and flow measured by the tester
will most accurately represent the conditions within the fuel rail. Due to
some engine compartment layouts and connector locations, it may be
necessary to connect the tester directly after the in-line fuel filter, which
may be located in the engine compartment, under the frame, or near
the fuel tank. In this case, be sure to carefully inspect the fuel supply
line between the tester and fuel rail for any irregularities such as leaks,
crimps, or kinks, as these may cause a false diagnosis based on the
tester readings.
Alternative Connection Locations
Connecting the FST inline as instructed above for the initial test,
ensures the most accurate fuel system diagnosis. However, in some
instances it may be beneficial to connect the tester at alternative loca-
tions to more accurately pinpoint the exact cause of a malfunction.
Performing additional diagnostics at different connection locations is
detailed in the Testing and Diagnostics section of this manual.
Fig. 5
Fig. 6
Fig. 7
