Fuel management unit – Vortech 1996-2000 4.3L Truck/SUV User Manual

Page 17

P/N: 4GD020-010

26APR01 V1.2

(4.3L V-6/S-10-(4GD))

10. FUEL MANAGEMENT UNIT

A. Following the

Fig. 10-a, position the fuel management

unit (FMU) on the inside of the vehicle frame, underneath
the driver's seat. Mark and drill two #16 holes. Secure
the FMU using the supplied #12 hex head screws.

QUICK DISCONNECT TYPE FITTINGS ONLY
B. Using a fuel line disconnect tool, separate the 5/16”

fuel return (see

Figure 10-b). Attach the supplied 33”

fuel hose with the male fitting into the fuel line coming
from the engine compartment. Attach the 17” supplied
fuel hose with the female fitting into the line returning
back to the tank. Connect the fuel line coming from the
engine compartment to the 90

fitting on the side of the

FMU. Connect the fuel line returning back to the tank to
the straight fitting on the bottom of the FMU. Make sure
that both lines have smooth bends and are absolutely
free from sharp bends and kinks (see

Fig. 10-c).

COMPRESSION STYLE FITTINGS ONLY
B. Separate the factory 5/16" fuel rail return line at the

compression fitting junction underneath the vehicle near
the fuel filter. Attach the supplied -4 flare fitting adapters
to each end of the open return line (one fitting will point
toward the rear, and one toward the front). Connect one
end of the supplied 22" FMU hose to the return line
running back to the tank, and the other end to the
straight fitting on the center of the FMU. Connect one
end of the remaining 36" FMU hose to the return line
coming from the fuel rail, and the other end to the 90

fitting on the side of the FMU (see

Fig. 10-d).

C. Tap into the supercharger bypass valve vacuum hose

using the supplied 52” long length of hose and 5/32”
brass TEE. Route the hose in a manner that will keep it
away from exhaust heat and will allow gentle bends
without pinching. Attach the hose end to the lid of the
FMU.

FUEL LINE FROM RAIL

FUEL LINE TO TANK

QUICK DISCONNECT TYPE FITTING COMPRESSION TYPE FITTING

5/16” LINE
FROM RAIL

VACUUM LINE
TO MANIFOLD

5/16” LINE
TO TANK

FMU OUTLET
(TO TANK)

FMU INLET
(FROM FUEL
RAIL RETURN)

MOUNT TO FRAME

Fig. 10-b

Fig. 10-d

Fig. 10-c

FUEL PUMP HARNESS

FMU

Fig. 10-a

5/16” LINE
FROM RAIL

VACUUM LINE
TO MANIFOLD

5/16” LINE
TO TANK

FMU OUTLET
(TO TANK)

FMU INLET
(FROM FUEL
RAIL RETURN)

MOUNT TO FRAME

NOTE:

Some earlier model trucks are not equipped with

quick disconnect fittings and will require the use
of compression fittings and alternate fuel lines.
Proper lines and fittings are supplied to work
with both versions of this vehicle. Refer to Fig-
ures 10-c, 10-d to verify the vehicle you are
modifying.