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Home >> Jeep >> 1989 >> Wagoneer >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> 4.0L MPFI CEC Testing >> System Testing >> Notes
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System Testing: Notes

WARNING: Before testing fuel system, ALWAYS relieve residual fuel pressure in fuel delivery system before opening system. To prevent chance of personal injury, cover fittings with shop towel while connecting or disconnecting test equipment.