Edelbrock 3530 - Manual (Page 7)

7
Pro-Flo EFI Installation Instructions ©2005 Edelbrock Corporation
Rev. 2/05 Brochure #63-0273
Catalog #3530 & #3531
RUBBER 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 short 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 each side of the plate. Connect a length (at least 4 inches) of 5/16-
inch rubber return line hose to the hard line that will extend into the tank. Connect the rubber line to the fuel pickup line using tie
wraps.
RUBBER HOSE METHOD
BULKHEAD FITTING METHOD
Drill a 9/16-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 #6 AN bulkhead fitting (available at most speed shops) into the hole, the narrow end of the fitting on the inside of the
plate. Apply a metal washer with inter O-ring for seal. Connect a length (at least 4 inches) of flexible return line (rubber or braided
hose) to the fitting end. Connect the return line to the fuel pickup line using tie wraps.
NOTE: THIS METHOD REQUIRES NO WELDING OF THE FUEL SYSTEM.
NOTE: Whichever method you use to install the return fuel line,
be careful to keep the end of the line away from the fuel pickup,
as shown. Otherwise, aerated return fuel can be drawn into the
pickup.