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Home >> GMC >> 1988 >> Forward Control 4.8 T, Automatic, 475/M40 >> Repair and Diagnosis >> Engine Performance >> System >> CCC TBI Tests W/Codes >> Diagnostic Charts >> Code 44 - Lean Exhaust Indication >> Fuel Contamination

Fuel Contamination

Water, even in small amounts, near in-tank fuel pump inlet can be delivered to fuel injectors. Water causes a lean exhaust and can set Code 44.