Vortech 1997-2003 Ford 5.4 F-150/Expedition - Manual (Page 14)

P/N: 8N020-130
© 2005 Vortech Engineering, LLC
All Rights Reserved, Intl. Copr. Secured.
19SEP05 v1.0 97-03F150PwrClr(8N020-130v1.0)
8
7. Fuel Management Unit Recalibration
Fig. 7-a
WARNING: Do not remove the four screws hold-
ing the valve body. Once taken apart,
the valve would have to be replaced.
A. Remove the six allen-head screws on top of
the fuel management unit (FMU).
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.) inside 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.).
8:1
RING &
DISC