P/N: 4MB020-010
©2003 Vortech Engineering, LLC
All Rights Reserved, Intl. Copr. Secured
06DEC02 V1.0(4MB HP500 v1.0)
9
Fig. 5-e
Fig. 5-f
J. Remove the stock fuel regulator and cut the
upper portion off of the regulator using a fine
tooth hacksaw or an abrasive cutoff wheel as
shown in Fig. 5-d. Clean the regulator out and
make sure that there are no loose chips or
debris. Install the adjustable top.
K. Remove the sealing nut at the bottom of the
regulator and remove the brass plug from the
inside (this may require air to be blown into the
open end to force out the brass plug). Install the
fitting onto the bottom of the regulator and make
sure the O-ring is still there and tighten. Re-
attach the regulator to the fuel rail. (See Fig. 5-f.)
L. Install the new injectors into the fuel rail first using
a small amount of oil to lubricate the O-rings.
Reinstall the injector retaining clips.
M. Install the rail assembly into the lower manifold
and secure with the stock hardware. Reconnect
each one of the electrical connectors to each
injector.
N. Install the fuel lines to the fuel rail before reinstall-
ing the upper manifold.
O. Remove the stock PCV valve and replace with
the one provided.
5. FUEL INJECTOR REPLACEMENT, cont'd.
TOP OF FUEL
REGULATOR
TO BE DISCARDED
1/4”
FACTORY
REGULATOR
Fig. 5-d
NOTE:
Two types of regulators are supplied by
Mercruiser from the factory. The exit
orifice will measure either .090" or .120"
If the regulator on your engine is the
.090" unit, it must be replaced with a
.120" unit for proper fuel bypass.
ADAPTER FITTING w/MODIFIED
REGULATOR INSTALLED
