Mityvac MV5545 FST PRO FUEL SYSTEM TESTER - Manual (Page 20)

Fig. 35
reduce fuel spillage, whenever possible, try to select the required
adapters before disconnecting the fuel line, and have them ready to
install.
Setting-up the FST Pro
Once the installation point has been determined, follow the instruc-
tions below to setup the tester prior to disconnecting the fuel line.
1. Place the vehicle transmission in park or neutral, apply the parking
brake, and turn the key off.
2. Hang the pressure gauge under the vehicle hood or other appro-
priate location.
3. Connect the flowmeter to the pressure gauge using the female
push-to-connect coupler extending from the bottom of gauge,
and the male connector located on top of the flowmeter. Make
sure the quick-connect sleeve snaps forward to lock the connec-
tion.
NOTE: The flowmeter should hang vertically for the most accurate
fuel flow measurement.
4. Connect the 1/8" (3 mm) clear pressure relief hose to the barb
extending from the push-button pressure relief valve located just
under the gauge (Fig. 31).
5. Place the free ends of the bypass hose and pressure relief hose
into an approved gasoline fuel container. Secure hoses in fuel
container as necessary to prevent spills.
6. Connect one end of each 3/8" inlet and outlet connection hoses
to the bottom fittings on the FST flowmeter (Fig. 32).
Installing the FST Pro
1. Be sure the vehicle transmission in park or neutral, the parking
brake is applied, and the engine is off.
2. Follow the vehicle manufacturer’s recommended procedure to
relieve the pressure from the vehicle fuel delivery system.
3. Locate the fuel supply line to the engine’s fuel rail, and select the
best location to disconnect the supply line and install the FST
(Fig. 33). If uncertain of the proper connection point, see the
previous section entitled Determining Where to Install the FST.
For additional assistance, consult the vehicle manufacturer’s
service information, or refer to the Types of Fuel Delivery Systems
section earlier in this manual.
If the engine has a cover, it will most likely have to be removed to
gain appropriate access.
4. Remove or disconnect any obstacles required to gain access to
the connection, and place shop towels under and around the
connection to absorb fuel from the disconnected line.
To minimize fuel spillage and reduce the amount of time the fuel
line is disconnected, try to identify the type of connection before
disconnecting the fuel line, and have the required FST connection
adapter(s) readily available (see Selecting and Installing Adapters
above). Also, identify the inlet and outlet hoses to the tester, and
keep them convenient.
5. Follow the vehicle manufacturer’s service information for the prop-
er method to disconnect the fuel line. Special wrenches or dis-
connect tools may be required (Fig. 34).
WARNING: Avoid spilling fuel on hot engine parts. Clean-up any
fuel spills immediately after they occur.
6. Install the appropriate adapter into the fuel supply line extending
from the tank (Fig. 35).
Page Number - 20 Form 824127
Fig. 32 Fig. 31
Fig. 33
Connection Location
Fuel Line
Fig. 34