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ON-VEHICLE SERVICE TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L> 13A-441 13.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 return line closed to confirm leak-down occurs from defective fuel pressure regulator. (2) Squeeze the fuel supply line closed to confirm leak-down occurs from defective fuel pump check valve. (3) If pressure continues to drop with both fuel lines squeezed closed, injector(s) are leaking. 14.14.Release residual pressure from the fuel pipe line. (Refer to WARNING Cover the hose connection with shop towels to 15.Remove the fuel pressure gauge, and special tools MD998709 and MD998742 from the fuel rail. 16.Replace the O-ring at the end of the high-pressure fuel hose with a new one. 17.Fit the high-pressure fuel hose into the fuel rail and tighten the bolts to specified torque. Tightening torque: 4.9 ±±±± 1.0 (44 ±±±± 8 in-lb) 18.Check for fuel leaks. (1) Use scan tool MB991502 to operate the fuel pump. 19.Disconnect scan tool MB991502. Fuel pressure too high Binding valve in fuel pressure reg- Replace fuel pressure regulator Clogged fuel return hose or pipe Clean or replace hose or pipe Same fuel pressure when vacuum Damaged vacuum hose or Replace vacuum hose or clean Defective fuel pressure regulator Replace fuel pressure regulator SYMPTOM PROBABLE CAUSE REMEDY Fuel pressure drops gradually af- Leaky injector Replace injector Leaky fuel regulator valve seat Replace fuel pressure regulator Fuel pressure drops sharply imme- Check valve in fuel pump is held Replace fuel pump SYMPTOM PROBABLE CAUSE REMEDY AK000120 AK000120 HIGH- MD998709 MD998742 FUEL RAIL AB |