So I’m trying to find where this connection is on my 2000 ford ranger. I’m looking for the S311 connection. It comes from the flex fuel sensor and then splits off to the EVAP solenoid and other stuff. Any idea where S311 connection is? Or how to find out where it is?

 

"S" = splice, so it won't look like a connector, usually inside a harness just taped up, in this case 3 wires crimped and taped
Best guess is it will be in the frame rail near the Flex Fuel sensor since that wire powers the FF sensor and EVAP solenoid behind the gas tank