Vortech 1997-2001 Ford/Lincoln 4.6L/5.4L Truck/SUV User Manual

Page 21

P/N: 4FM020-010

20OCT03

v3.1 4.6/5.4Exped/Nav(4FM v3.1)

ENGINE

FUEL FEED LINE

FUEL RETURN LINE

FUEL TANK

FUEL

MANAGEMENT

UNIT (FMU)

T-REX

FILTER

FACTORY
SPRINGLOCK
CONNECTOR

VACUUM LINE

FACTORY
REGULATOR

INLET

OUTLET

FACTORY
QUICK-
DISCONNECT
FITTING

FACTORY VACUUM
CONNECTION

Fig. 10-b

heat with the provided tie wraps.

Tap into the factory fuel regula-

tor vacuum line with the supplied
5/32" hose and TEE. Route the
new hose to the fitting on top of
the FMU (see drawing).

10.1

FUEL MANAGEMENT UNIT

RECALIBRATION (2003 5.4L Only)

Remove the six allen-head screws on top of the fuel

management unit (FMU). (See Fig. 7/1-a.)

Remove the diaphram and 7:1 disk (2.038' O.D.) and

ring from inside of the FMU.

Install the replacement 8:1 ring (with notched part

facing down) around the four screws inside the FMU.
(The 8:1 components are larger in diameter that their
7:1 counterparts.) Place the 8:1 disk (2.22' O.D.) in-
side the ring on top of the piston.

Install the new diaphram and carefully line up the holes

to the body.

Reinstall the FMU cover with the six allen-head screws.

Do not overtighten the screws. The correct torque is
24 in/lb (2 ft/lb.).

WARNING:

Do not remove the four screws holding
the valve body. Once taken apart, the
vlave would have to be replacedl.

Fig. 10-c