Equus 3640 - Fuel Injection Pressure Tester - Manual (Page 9)

Testing
Fuel 2-2
• The tee adapter is suitable for use with most fuel injection systems
equipped with rubber fuel hoses secured by fuel line clamps at the fuel rail
or throttle body (see Figure 6).
• The tee adapter is not suitable for use with fuel injection systems equipped
with rigid, metallic or plastic fuel lines or connectors.
2.2 TEST PROCEDURES
WARNING: Fuel injection systems are under high pressure. You MUST
relieve system pressure before connecting the tester. REFER
TO YOUR VEHICLE'S SERVICE MANUAL FOR
PROCEDURES.
• Before connecting the tester to the fuel system, apply a small amount of
light grade household oil or lubricant to the o-rings located in the port
adapters.
• When attaching the gauge hose or adapters to test ports, make sure you use
the proper adapter for your vehicle. TAKE CARE not to damage the threads
on the test port.
• Wrap shop rags around fitting when connecting or disconnecting the tester.
• Have shop rags ready to clean up leaks or spills.
2.2.1 Testing Systems WITH Schrader Valve Test Ports (Typical TBI & MFI Systems)
(see Figure 4)
a. Relieve fuel system pressure BEFORE connecting tester (refer to your
vehicle's service manual for procedures).
DRAIN
CONTAINER
TESTER GAUGE
GAUGE HOSE
FORD ADAPTER (FOR USE WITH FORD
AND SOME CHRYSLER VEHICLES)
(SCHRADER
VALVE)
BLEED-OFF
HOSE
RELIEF
VALVE
Figure 4. Testing Systems With Schrader Valve Test Ports