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5.
Release relief valve to close.
Fuel Pressure Leak Down
Note: For GM low pressure TBI, test
does not work because of pressure drop
caused by pressure regulator design.
1.
Run engine at idle and compare
Pressure Gauge pressure with pressure
specified in vehicle's service manual.
Fuel Pump Output Pressure (Dead Head)
1.
Turn ignition to OFF.
Cold Control Pressure (CIS)
Note: Engine must be cold for this test.
1.
Run engine at idle until Pressure
Gauge pressure stabilizes.
CAUTION! Do not run engine for more than
one minute with regulator disconnected.
Hot Control Pressure (CIS)
1.
Run engine at idle until it reaches
operating temperature.
Reset Pressure (CIS)
Same as Fuel pressure leak Down.
Primary System Pressure (CIS/GM TBI)
Fuel Pump Output - Dead Head
1.
Run engine at idle until it reaches
operating temperature.
Note: Do not close valve for more
than 10 seconds. Closed valve
creates very high fuel pressure.
Page 8
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Note: Fuel pump should maintain engine
idle and output a minimum of one pint of
fuel in 30 seconds. (For CIS and CISE,
output should be one quart in 30 seconds).
2.
Turn ignition to OFF and
wait 15 to 20 minutes.
3.
Check gauge pressure. Pressure
should not drop more than specified
in vehicle's service manual. If it does,
pressure may be leaking down.
2.
Compare Pressure Gauge
pressure with pressure specified
in vehicle's service manual.
2.
Disconnect electrical connector from
fuel control pressure regulator.
3.
Turn ignition to OFF.
4.
Reconnect electrical connector to
fuel control pressure regulator.
2.
Compare pressure gauge
pressure with pressure specified
in vehicle's service manual.
2.
Close shutoff valve on
TBI/CIS Hose assembly.
3.
Compare Pressure Gauge
pressure with pressure specified
in vehicle's service manual.
Item 58817
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