1983 Euro 500SEC AMG, 83 SEC custom convertible, 2x 84 500SEC, 02 w203coupe, euro 1985 300d
restoring yet another wreck of an sec that has been sitting for 5 years, did the usual and replaced all the rubber lines fuel pump, filter, cleaned everything from engine back including the level sensor and washed out the tank with acetone+ pressure washer along with replacing the screen and is now drying out in the hot fl sun-------one question for a more experienced one than I-------the smaller hole on the bottom of the tank (return line?) next to the larger hole where the screen is located had a lot of build up in it but it will not clear out-------is this supposed to remain closed?? is there a valve that is stuck shut?????? which way is the fuel supposed to travel through this opening??? in or out of the tank??? thanks for the input any ideas on how to remedy this situation???