User's Manual

P/N: 4HS020-010
©2004 Vortech Engineering, LLC
All Rights Reserved, Intl. Copr. Secured
27JUL04 v2.0 S2000 (4HSv2.0)
11
7. FUEL RAIL/REGULATOR MODIFICATIONS (2004 Models Only)
Fig. 7-a
Fig. 7-b
A. Disconnect the fuel feed line running to the
middle of the factory fuel rail.
B. Remove the hose connected to the return side of
the fuel regulator.
C. Loosen the factory screws securing the fuel rail
and remove the fuel rail from the vehicle.
D. 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.
E. 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.
F. Using a thread sealant, install the 1/8 NPT end of
the supplied fitting into the fuel rail until the fitting
is snug.
G. Reinstall the fuel rail back into the vehicle. Re-
connect the fuel feed line and secure all the
factory hardware.
NOTE: At this time, leave the fuel return line dis-
connected from the fuel regulator.
H. Remove the two screws securing the fuel pres-
sure regulator to the fuel rail.
I. Following
Fig. 7-c , drill a .078" hole in the rear of
the regulator. (This allows the regulator to by-
pass more fuel due to increased static fuel pres-
sure.)
NOTE: This step is also recommended for 2001-
2003 model years.
J. Clean all debris and reinstall the fuel pressure
regulator back onto the fuel rail, verifying align-
ment of the O-ring.
K. Reconnect the fuel return line to the bottom barb
on the fuel pressure regulator.
Fig. 7-c
2004 FUEL RAIL
MODIFICATIONS
DRILL WITH AN ‘R’ DRILL
AND TAP 1/8 NPT
4.10"
.60"
FUEL PRESSURE
REGULATOR
DRILL .078" HOLE
RETURN HOSE
FUEL FEED LINE
SUPPLIED -4 x 1/8NPT FITTING