Mityvac MV5545 FST PRO FUEL SYSTEM TESTER - Manual (Page 33)

the hose is clamped, quickly disconnect the hose from the fuel
system before the pressure has time to build. Try to keep a shop
towel wrapped around the connection to catch any fuel spray.
4. Rotate the flow control valve to the CLOSED position to help pre-
vent fuel leakage.
5. With the scissor clamps locked in place on the connecting hoses,
disconnect the FST adapters and fitting connectors from the vehi-
cle’s fuel system (Fig. 58).
6. Reconnect the vehicle fuel lines and check for possible fuel con-
nection leaks before starting the engine (Fig. 59). Cycling the igni-
tion ON and OFF without starting the engine, will run the fuel
pump briefly to prime the fuel system on most vehicles. Always
check fuel line connections to ensure they are securely fastened
and do not leak.
7. Place the disconnected ends of the connection hoses into an
approved fuel container with the bypass and pressure relief hoses.
Drain fuel from the FST flowmeter, gauge and hoses by releasing
the scissor clamps. Rotate the flow control valve and press the
pressure relief valve as necessary to ensure all fuel is drained from
the tester.
8. Use the plastic hose plugs supplied in the FST kit, to temporarily
cap the open ends of the flowmeter connecting hoses (Fig. 60).
9. If testing is complete, disassemble and store all components of
the FST Pro in the original case.
Form 824127 Page Number - 33
Fig. 59
Fig. 58
Fig. 60