Vortech 1986-1993 Ford 5.0 Mustang - Manual (Page 16)

P/N: 4FA020-010
© 2009 Vortech Engineering, LLC
All Rights Reserved, Intl. Copr. Secured
16APR09 v4.1(86-93 5.0 Mus (4FA v4.1))
4
5.1 FUEL MANAGEMENT UNIT RECALIBRATION
Fig. 5.1-e / FMU
(For Cobra models or vehicles equipped with 24
lb. injectors only.)
A. Remove the six allen head screws on top of
the fuel management unit (FMU). (See Fig.
4-e.)
B. Remove the diaphragm and disk (and the ring,
if equipped) from inside of the FMU.
C. Install replacement ring (with the notched part
facing down) around the four screws inside
the FMU.
D. Place the new disk inside the ring on top of
the piston.
E. Install the new diaphragm and carefully line
up holes to the body.
F. Reinstall the FMU cover with the six allen head
screws. Do not overtighten the screws. The
correct torque is 24 in/lbs (2 ft/lbs).
WARNING: Do not remove the four screws
holding the valve body. Once
taken apart, the valve would
have to be replaced.