Vortech 2000-2008 Honda S2000 User Manual

Page 23

P/N: 4HS020-010

21OCT08 v4.0 S2000(4HS020-010v4.0)

7. FUEL RAIL/REGULATOR MODIFICATIONS (2004/2005 Models Only)

A. Using a 10mm socket, remove the two nuts

that secure the plastic cover on the fuel rail.

Set the nuts and cover aside to be reinstalled

later.

B. Disconnect the fuel feed line running to the

middle of the factory fuel rail.

C. Remove the hose connected to the return

side of the fuel regulator.

D. Loosen the factory screws securing the fuel

rail and remove the fuel rail from the vehicle.

Using Figs. 7-a, 7-b, mark the location to be

drilled. Keeping the drill perpendicular to the

fuel rail, drill a .339" (R drill bit) hole into the

top of the fuel rail.

With a 1/8"NPT tap, thread the newly drilled

hole until the tap is 1/3 of the way inside the

hole or the supplied 1/8"NPT x -4 fitting can

be started. Thoroughly clean all debris from

the fuel rail.

G. Using a thread sealant, install the 1/8"NPT

end of the supplied fitting into the fuel rail

until the fitting is snug.

H. Reinstall the fuel rail back into the vehicle.

Reconnect the fuel feed line and secure all

the factory hardware.

Fig. 7-b

FUEL PRESSURE

REGULATOR

DRILL .078" HOLE

Fig. 7-c

NOTE: this step is also recommended for 2001-

2003 model years.

NOTE: at this time, leave the fuel return line dis-

connected from the fuel regulator.

2004/2005 FUEL RAIL

MODIFICATIONS

DRILL WITH AN ÔRÕ DRILL

AND TAP 1/8 NPT

4.10"

.60"

Remove the two screws securing the fuel

pressure regulator to the fuel rail.

Following Fig. 7-c, drill a .078" hole in the

rear of the regulator. (This allows the regula-

tor to bypass more fuel due to increased stat-

ic fuel pressure.)

K. Clean all debris and reinstall the fuel pres-

sure regulator back onto the fuel rail, verifying

alignment of the O-ring.

Reconnect the fuel return line to the bottom

barb on the fuel pressure regulator.

M. Re-install the plastic fuel rail cover using the

factory nuts to secure it. The cover will need

to be trimmed to clear the 1/8"NPT fitting pre-

viously installed.

Fig. 7-a

FUel Feed line

SUpplied -4 x 1/8”npt Fitting

retUrn HoSe