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ON-VEHICLE SERVICE TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE> 13A-1126 11.Stop the engine and observe fuel pressure gauge reading. It is normal if the reading does not drop within two minutes. If it (1) Squeeze the fuel supply line closed to confirm leak-down occurs from defective fuel pump check valve. (2) If pressure continues to drop with both fuel lines squeezed closed, injector(s) are leaking. 12.Release residual pressure from the fuel pipe line. (Refer to WARNING Cover the hose connection with shop towels to pre- 13.Remove the fuel pressure gauge, and special tools MD998709, MD998742 and MB991637 from the fuel rail. 14.Replace the O-ring at the end of the fuel high-pressure hose with a new one. 15.Fit the fuel high-pressure hose into the fuel rail and tighten the bolts to specified torque. Tightening torque: 5.0 ± 1.0 N⋅m (44 ± 8 in-lb) 16.Check for fuel leaks. (1) Use scan tool MB991958 to operate the fuel pump. 17.Disconnect scan tool MB991958. SYMPTOM PROBABLE CAUSE REMEDY • Fuel pressure too low • Fuel pressure drops after racing Clogged fuel filter Replace fuel filter Fuel leaking to return side due to Replace fuel pressure regulator Low fuel pump delivery pressure Replace fuel pump Fuel pressure too high Binding valve in fuel pressure Replace fuel pressure regulator SYMPTOM PROBABLE CAUSE REMEDY Fuel pressure drops gradually Leaky injector Replace injector Leaky fuel regulator valve seat Replace fuel pressure regulator Fuel pressure drops sharply Check valve in fuel pump is held Replace fuel pump AKX01460AC FUEL FUEL HIGH- MD998742 MD998709 |