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Home >> Ford >> 1996 >> Explorer 2D Utility, RWD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing - 4.0L >> Fuel System >> Fuel Pressure
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Fuel Pressure

WARNING: Inspect fuel system for leaks or damage before testing fuel pump.
NOTE: For fuel pressure specifications, see FUEL PRESSURE SPECIFICATIONS article.
  1. Release fuel pressure. Install fuel pressure gauge. Turn ignition on and read fuel pressure. Start engine and read fuel pressure. Compare fuel pressure reading on fuel pressure gauge with specifications. For fuel pressure specifications, see FUEL PRESSURE SPECIFICATIONS article.
  2. If fuel pressure is not within specifications, check fuel pressure regulator. With engine running, connect hand vacuum pump and apply vacuum to regulator.
  3. Ensure fuel pressure changes as vacuum at regulator is increased and decreased. If no pressure change occurs, replace regulator and recheck system. For additional testing information, see FUEL SYSTEM in the TESTS W/CODES - 4.0L article.
Fig 1: Identifying Fuel Pump Self-Test Connector
G90I04610Courtesy of FORD MOTOR CO.
FUEL PUMP PERFORMANCE

Application Specification
Pressure (1)
Volume (2)
(1) For fuel pressure specifications, see FUEL PRESSURE SPECIFICATIONS article.
(2) Volume is one pt. (.5L) in 30 seconds.
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