P/N: 4MB020-010
©2003 Vortech Engineering, LLC
All Rights Reserved, Intl. Copr. Secured
06DEC02 V1.0(4MB HP500 v1.0)
8
5. FUEL INJECTOR REPLACEMENT
A. Disconnect the wiring connecting to the throttle
position sensor (TPS), manifold air pressure
(MAP) and the idle air controller (IAC)
B. Remove all the screws securing the upper mani-
fold to the lower manifold.
C. Carefully lift the upper manifold off of the lower.
Note that the throttle cable may stay attached if
the upper manifold is tilted over onto its side.
Cover each of the ports of the lower manifold to
prevent debris from falling in. (See Fig. 5-a.)
D. Remove the stock fuel filter and hard line located
at the back of the manifold. (See Fig. 5-b.)
E. Remove the four screws securing the fuel rails to
the lower intake manifold.
F. Mark each of the injector connectors (with mask-
ing tape and a pen) corresponding to each cylin-
der/port. This will aid in reinstallation.
G. Disconnect each one of the electrical connectors
from each injector by pressing down on the
spring clip and pulling up. Do not pull on the wires
as this could cause an open circuit.
H. Remove the fuel rails with the injectors still at-
tached to it. (See Fig. 5-c.) Look into each
injector port for any loose O-rings that may have
come off of the injectors. Remove the clips
securing the injectors to the fuel rail. Remove
each injector from the fuel rails and look for any
loose O-rings in the fuel rail. (See Fig. 5-e.)
I.
Remove the #6 fitting on the fuel rail and replace
with the provided #8 x 3/8 NPT x 45
°
fitting.
Orient the fitting so that when the fuel rail is
installed the fitting will be pointing toward the
starboard side.
Fig. 5-a
Fig. 5-b
Fig. 5-c
