Mallory Ignition ACCEL Digital Fuel Injection Engine Management System 74030 - Manual (Page 20)

18
ACCEL/DFI
RETURN FUEL LINE INSTALLATION
If your vehicle was originally equipped with a carburetor,
you MUST run a 5/16” ID (inner diameter) or larger return
line from the engine (fuel pressure regulator) to the fuel
tank. Some vehicles with carburetors came with 1/4”
diameter return lines. This is too small in ID (inner
diameter) and will create an unacceptable amount of back
pressure in the fuel line, thus causing a rich condition.
Using good judgment install a fuel line from the pressure
regulator outlet to the fuel tank with restriction free bends
in protected areas (refer to the diagram at the end of the
“Routing High Pressure Fuel Hose” section). The fitting at
5/16 Fuel Return Line Must Be
Added to Non-Fuel Injected
Vehicles. See Installation
Manual for Proper Installation
Braze Tube to Flange
making Sure Not to
Melt any Rubber or
Plastic Components
Existing Wire Harness
High Pressure Feed
Vapor Vent
Emissions/Canister
Top of Tank
Bottom of Tank
Return Line
2"