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What is the correct fuel pressure for a 1991 ford ranger with 4.0L engine?

The fuel pressure for a 1991 Ford Ranger with a 4.0L engine should be between 35 and 45 PSI (pounds per square inch). This is measured with the engine running. Always consult your owner's manual or a reputable repair manual for the most accurate specifications. Slight variations may exist depending on the exact specifications of your engine and fuel system.