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6E–110 ENGINE DRIVEABILITY AND EMISSIONS Fuel System Diagnosis Step Action Value(s) Yes No 1 Was the “On-Board Diagnostic (OBD) System Check” — Go to Step 2 Go to OBD System Check 2 1. Turn the ignition OFF. 2. Turn the air conditioning system OFF. 3. Relieve fuel system pressure and install the fuel pressure gauge. 4. Turn the ignition ON. NOTE: The fuel pump will run for approximately 2 5. Observe the fuel pressure indicated by the fuel pressure gauge with the fuel pump running. Is the fuel pressure within the specified limits? 283-376 kPa (41-55 psi) Go to Step 3 Go to Step 17 3 Does the fuel pressure indicated by the fuel pressure NOTE: The fuel pressure will drop when the fuel — Go to Step 4 Go to Step 12 4 1. When the vehicle is at normal operating temperature, turn the ignition ON to build fuel 2. Start the engine and observe the fuel pressure gauge. Did the reading drop by the amount specified after the 21-105 kPa (3-15 psi) Go to Step 5 Go to Step 9 5 Is fuel pressure dropping off during acceleration, — Go to Step 6 Check for improper fuel 6 Visually and physically inspect the following items for • The in-line fuel filter. • The fuel feed line. — Verify repair Go to Step 7 7 Remove the fuel tank and visually and physically • The fuel pump strainer for a restriction. • The fuel line for a leak. • Verify that the correct fuel pump is in the vehicle. — Verify repair Go to Step 8 8 Replace the fuel pump. — Verify repair — 9 1. Disconnect the vacuum hose from the fuel pressure regulator. 2. With the engine idling, apply 12-14 inches of vacuum to the fuel pressure regulator. Does the fuel pressure indicated by the fuel pressure 21-105 kPa (3-15 psi) Go to Step 10 Go to Step 11 |