Actron KAL2535 User Manual

Page 9

7. If the system has an adjustable fuel pressure

regulator, it should maintain system pressure while

the engine is running. If a compensating fuel

pressure regulator is used, fuel pressure may vary,

depending on manifold vacuum.

8. Locate a flexible hose on the fuel return side and

gently squeeze off return flow briefly. Never squeeze

a steel braided or plastic hose. Pressure should

increase rapidly.

CAUTION: Some fuel pump designs can be damaged by

this test. This test should not be performed

unless recommended by the manufacturer.

13. Remove the Test Gauge and reconnect all the fuel

lines.

14. Start the engine and check for leaks.
15. Remove residual fuel from all Test Gauge hoses. If

fuel remains in the Test Gauge hose, install any

adapter in the test hose quick connect. Put the Test

Gauge hose and bleed-off tube in a disposal

container. Press the bleed valve on the Test Gauge.

The fuel will drain into the container.

FIGURE 1

TYPICAL MULTI-PORT FUEL INJECTION SYSTEM WITH TEST PORT

FUEL PRESSURE TEST POINT

MANIFOLD VACUUM

FLEX HOSE

FUEL PRESSURE LINE

IN-TANK FUEL

PUMP

FUEL RETURN LINE

PUMP INLET FILTER

PRESSURE REGULATOR

FILTER

FUEL INJECTORS