Vortech 1986-1993 Ford 5.0 Mustang User Manual

Page 16

P/N: 4FA020-010

16APR09 v4.1(86-93 5.0 Mus (4FA v4.1))

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.