Equus 3640 - Fuel Injection Pressure Tester Manual do Utilizador descarregar pdf (Página 8)

2-1 Fuel

2.1 GENERAL

The tests outlined in this manual are for checking Throttle Body Fuel Injection

(TBI) (see Figure 2) and Multi-port Fuel Injection (MFI) (see Figure 3) fuel

system pressures with the engine running (key on, engine on) and without the

engine running (key on, engine off). Engine running tests are performed with

the engine at idle (unless otherwise noted). The adapter for testing GM vehicles

with test ports is already installed on the end of the gauge hose, while the Ford

adapter is separate. For Chrysler vehicles, depending upon application, either

adapter may be used.

Some fuel injection systems are not equipped with a test port (Schrader valve).

In some cases, these systems may be tested using the tee adapter provided with

the tester:

TBI UNIT

FUEL INJECTORS

THROTTLE BODY

PRESSURE REGULATOR

FUEL CAP

FUEL RETURN LINE

IN-LINE

FUEL FILTER

FUEL PRESSURE LINE

FLEXIBLE HOSE

FUEL TANK IN-TANK

FUEL PUMP

PUMP INLET

FILTER

Figure 2. Typical Throttle Body Fuel Injection (TBI) System

FUEL INJECTORS

PRESSURE

REGULATOR

MANIFOLD VACUUM

HOSE CONNECTION

TEST PORT

(SCHRADER

VALVE)

PULSE

DAMPENER

FLEXIBLE

HOSE

IN-LINE

FUEL FILTER

FUEL RETURN LINE

FUEL PRESSURE LINE

FUEL

CAP

FUEL TANK PUMP INLET

FILTER

IN-TANK

FUEL PUMP

PULSATOR

Figure 3. Typical Multi-Port Fuel Injection (MFI) System

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

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