Premier L4-150 2.5L (1988)
Fuel Pressure Regulator: Adjustments
Testing Fuel Pressure
1.
Remove the plug from the pressure test port on the throttle body.
2.
Install a pressure test fitting (tool 6173 or equivalent) in place of the plug, and connect a 0-207 kPa (0-30 psi) fuel pressure gauge to the test
fitting.
3.
START engine and allow it to idle. The pressure gauge should read 97-103 kPa (14-15 psi). If the fuel pressure reading is within this range the
pump is operating correctly, and no adjustment is necessary.
Fuel Pressure Adjustment
4.
If the fuel pressure reading is low, turn the pressure adjusting screw inward (clockwise) to increase the fuel pressure to the correct range. If the fuel
pressure fails to increase into specified range there is a fuel delivery problem that must be diagnosed and repaired before the fuel pressure can be
adjusted.
5.
If the fuel pressure reading is high, turn the pressure adjusting screw outward (counterclockwise) to decrease the fuel pressure to the correct range.
If the fuel pressure fails to decrease into specified range there is a fuel delivery problem that must be diagnosed and repaired before fuel pressure
can be adjusted.
