Locate the A/C Compressor (see image) and follow the metal line to the right up and back until you come to the Low Side Service Port.
Thats the only diagram that I get for a 2001 Ford F-150 5.4L. I will opt-out and forward your question to another Tech that may better help you. Sit tight one second, someone will be right with you...
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New Expert here.
The low side port is located on the accumulator on the passenger side of the firewall. You will have to move the harnesses and the heater hoses to see it.
Ford kind of hid it from view.
That is what is in the picture. The can as you call it is the accumulator. I circled the port in red.
Look back at the last post I posted.