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P/N: 4FM020-010
© 2003 Vortech Engineering, LLC
All Rights Reserved. Intl. Copr. Secured
20OCT03
v3.1 4.6/5.4Exped/Nav(4FM v3.1)
13
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.
F. 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)
A. Remove the six allen-head screws on top of the fuel
management unit (FMU). (See Fig. 7/1-a.)
B. Remove the diaphram and 7:1 disk (2.038' O.D.) and
ring from inside of the FMU.
C. 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.
D. Install the new diaphram and carefully line up the holes
to the body.
E. 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