Montero LS 4WD V6-2972cc 3.0L SOHC 12 Valve (1994)
4. Measure the fuel pressure during idling.
Standard value: Approx. 270 kPa (38 psi) at curb idle
5. Disconnect the vacuum hose from the fuel pressure regulator and plug the hose with your finger.
6. Measure the fuel pressure in this condition.
Standard value: 330-370 kPa (47-53 psi) at curb idle speed
7. Check that the fuel pressure during idling does not decrease even after the engine is raced a few times.
8. Use a finger to gently press the fuel return hose while repeatedly racing the engine, and check that there is fuel pressure in the return hose also.
NOTE: There will be no fuel pressure in the return hose if there is insufficient fuel flow.
9. If the fuel pressure measured in steps (4) to (6) is outside the standard value range, check for the probable cause by referring to the table above,
and then make the appropriate repair.
Testing the Fuel Pressure Leakdown - Engine Off
Stop the engine and check for a change of the value indicated by the fuel pressure gauge. The condition is normal if there is no decrease in the
indicated value within two minutes. If there is a decrease in the indicated value, monitor the speed of the decrease, and, referring to the table
above, determine the cause of the problem and make the appropriate repair.
Restoring the Fuel System to Pre-Test Condition
