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6E–114 6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS Fuel System Diagnosis (Cont'd) Step No Yes Value(s) Action 8 Replace the fuel pump. Is the action complete? — 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 10 Locate and repair the loss of vacuum to the fuel Is the action complete? — Verify repair — 11 Replace the fuel pressure regulator. Is the action complete? — Verify repair — 12 1. Run the fuel pump with the Tech 2. clamp the supply hose shut with suitable locking Does the fuel pressure indicated by the fuel pressure — Go to Step 13 Go to Step 15 13 Visually inspect the fuel supply line and repair any Was a problem found? — Verify repair Go to Step 14 14 Remove the fuel tank and inspect for leaky hose or Was a problem found? — Verify repair Go to Step 8 15 1. If the pliers are still clamped to the fuel supply hose, remove the locking pliers. 2. With suitable locking pliers, which will not damage the hose, clamp the fuel return line to prevent fuel 3. Run the fuel pump with the Tech 2. pump. Does the fuel pressure indicated by the fuel pressure — Go to Step 11 Go to Step 16 16 Locate and replace any leaking fuel injector(s). Is the action complete? — Verify repair — 17 Is the fuel pressure indicated by the fuel pressure 376 kPa (55 psi) Go to Step 18 Go to Step 21 |