Edelbrock 3530 - Manual (Page 6)

6
Pro-Flo EFI Installation Instructions ©2005 Edelbrock Corporation
Rev. 2/05
Brochure #63-0273
Catalog #3530 & #3531
FUEL SYSTEM
Because your Edelbrock Pro-Flo system controls fuel delivery very differently than a carburetor, some conversions to your fuel
system are necessary. Pro-Flo electronic fuel injection requires high and constant fuel volume and fuel pressure. For this reason, a
good primary fuel line is critical. The Pro-Flo system includes a 3/8-inch high pressure fuel line which must be used as the primary
fuel line. The fuel that bypasses the injectors must be returned to the fuel tank via a return fuel line. If your vehicle is already
equipped with a fuel pump bypass line, this line can be used as the return fuel line. If not, the original primary line may be used as
the return line. If desired, an 8 foot length of 5/16 ID rubber hose is supplied for use as the return line.
Many late-model cars are equipped with an additional fuel line which runs to a charcoal canister mounted on the driver side of the
vehicle. This line MUST be re-installed after the fuel system conversion and MUST NOT be used as the return fuel line.
FUEL PUMP AND FILTER
The Pro-Flo system uses a single Edelbrock high-pressure electric fuel pump which
is capable of pumping 50 psi. The pump relay will shut down the pump if it does
not receive an engine-run signal from the ECU, as in the case of a stall. This safety
precaution is necessary when using a high-pressure fuel line. The provided fuel
filter should be mounted between the engine compartment and the fuel pump to
allow fuel to be pushed through the filter rather than drawn through. Electrical
connectors should face the front of vehicle.
FUEL PRESSURE REGULATOR
Fuel pressure is as important as fuel volume, particularly in fuel injection. The Pro-
Flo fuel pressure regulator maintains a constant pressure at the injectors with a
spring loaded by-pass to the return fuel line. Manifold pressure references the
regulator diaphragm to maintain constant pressure across all 8 injectors,
regardless of fluctuating manifold pressure (vacuum) level. The fuel that is not
injected is returned to the fuel tank via the return fuel line.
RETURN FUEL LINE
Due to the high fuel pressure used by the Pro-Flo system, the supplied 3/8-inch high pressure fuel line MUST be used as the
primary fuel line, and a bypass fuel return line must be installed. There are three options for installing a bypass return line.
1. Use the 5/16 rubber fuel line provided with the system as the fuel return line.
2. Use the vehicle’s existing primary line as the fuel return line with modification to the pick up as described below.
3. Use the vehicle’s existing return line (if so equipped) as the fuel return line. This option applies only to vehicles previously
equipped with fuel injection. If the vehicle is not already equipped with a return line, some fuel tank modifications are required
for routing the return line through the sending unit plate back into the tank. The first two methods listed below require some
welding and should be done by a professional radiator or fuel system repair shop.
Tank
Side
Engine
Side