Edelbrock 3550 User Manual page 8

BULKHEAD FITTING METHOD
HARD RETURN LINE METHOD
Drill a 5/16-inch hole in the sending unit plate adjacent to where the main line, enters the tank. This will be the hole for your return line. Insert a
length of 5/16-inch hard line (available at most radiator shops) into the hole and weld it to the sending unit plate. The hard line should extend
through the hole 1 to 2 inches on the outside of the plate. On the inside of the plate, the hard line should follow the contours of the fuel pickup
line. Bend the end of the return line away from the sock on the end of the fuel pickup line. Solder or weld the return hard line to the fuel pickup
line.
HARD RETURN LINE METHOD
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©2005 Edelbrock Corporation
Pro-Flo EFI Installation Instructions
Rev. 10/05 Brochure No. 63-0115