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Test 11: Fuel Line Pressure / Fuel Pressure Hold Inspection

TEST 11: FUEL LINE PRESSURE / FUEL PRESSURE HOLD INSPECTION

TEST 11 FUEL LINE PRESSURE / FUEL PRESSURE HOLD INSPECTION
STEP  INSPECTION  ACTION 
1 CHECK FUEL PRESSURE
WARNING: Before performing the following operation, release the fuel pressure from the fuel system to reduce the possibility of injury or fire.

See FUEL SYSTEM PRESSURE RELEASE in REMOVAL, OVERHAUL, & INSTALLATION article in Engine Performance .
  • Install Fuel Pressure Gauge SST 49UN01010.
  • Key ON, Engine OFF (KOEO).
  • Connect NGS Tester to the DLC and select Active Command Mode.
  • Select OUTPUT TEST MODE.
  • Press MODE to change to the "ALL ON" mode, and press start to run fuel pump.
  • Turn relay off.
  • Observe fuel pressure.
  • Is fuel pressure between 386-496 kPa (56-72 psi), 3.0L Flexible Fuel 380-517 kPa (55-75 psi)? 
 Yes Go to step 2.
No Zero or pressure low:
Check fuel pump.
If as specified, check fuel line and/or fuel filter for clog or restriction.
Pressure high:
See TEST 9: FUEL PRESSURE REGULATOR  , step 2.
2 CHECK FUEL PRESSURE AFTER ONE MINUTE
  • Observe fuel pressure after 1 minute.
  • Is fuel pressure within 34 kPa (5 psi) of previous reading? 
 Yes Fuel pressure hold inspection OK.
No Check the following:
  • Injector fuel leakage.

See TEST 12: FUEL INJECTOR INSPECTION  .
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