Fmu recalibration – Vortech 1999 & 2001 Ford 4.6L Mustang Cobra User Manual

Page 17

P/N: 8N020-060

26APR01 V1.0 (4V Maxflow PwrClr(8N020-060).qxd)

8. FMU Recalibration

Remove the six (6) allen head screws on top of
the fuel management unit (FMU).

Remove the diaphragm and washer (and the ring,
if equipped) from inside of the FMU.

Remove the four screws holding the valve body.
Once taken apart, remove the piston, small
diaphragm, disk and O-ring.

Remove and exchange fittings on the valve body.
A small amount of Teflon sealant (not silicone or
RTV) may be used on the fittings. Excessive
sealant may damage the FMU.

Install the new O-ring, disk and small diaphragm
as shown. The disk must be centered on the valve
body. The disk should not be allowed to make
contact with the screws as this can damage it,
resulting in FMU leakage and/or malfunction.

Before tightening the valve bodyscrews, install the
piston with the radius side down. Apply a small
amount of pressure on the piston to eliminate any
possibility of an air bubble being trapped between
the disk and diaphragm.

G. Tighten the four screws to 24in/lbs (2ft/lbs) in a

crisscross pattern to ensure a proper seal.

Install the replacement ring (with the notched part
facing down) around the four screws inside the
FMU.

Place the new washer inside the ring on top of the
piston.

Install the new diaphragm and carefully line up
holes to the body.

Reinstall the FMU cover with the six (6) allen head
screws. DO NOT OVERTIGHTEN THE SCREWS.
The correct torque is 24in/lbs (2ft/lbs).

NOTE: If you are unsure of your ability to correctly

complete these steps, please contact
Vortech Engineering at (805)247-0226 and
ask for the Service Department.

NOTE: Ignore this section if the kit is being origi-

nally installed into the vehicle with the
supercharger kit at the same time.