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What is the fuel pressure on a 1991 Ford Mustang?

The fuel pressure on a 1991 Ford Mustang varies depending on the engine. You'll need to specify the engine (e.g., 2.3L, 3.8L, 5.0L) to get an accurate answer. A repair manual specific to your Mustang's engine is the best resource for this information.

However, as a general guideline, expect the fuel pressure to be in the range of 30-40 PSI at idle. This is a broad range, and the exact specification can vary significantly. Do not rely on this general range for any repair or diagnostic work. Consult your vehicle's service manual for precise specifications.