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How much fuel pressure should a 2003 Lincoln ls have at the rail?

The fuel rail pressure for a 2003 Lincoln LS should be between 35-45 PSI. However, this is a general range, and the exact specification might vary slightly depending on engine type (the LS had a few different engine options) and operating conditions (engine speed, temperature). Consult your owner's manual or a reliable repair manual for the precise specifications for your specific engine.