Fast 30400-KIT-EZ-EF Instructions Manual - page 5
5
Before Getting Started
O2 Bung:
Your new EFI system is going to require the installation of an O2 sensor in order to continuously
monitor the air-fuel ratio of your engine. In order to do this, you will need to weld an O2 sensor bung
into your exhaust system (see the O2 sensor section for complete instructions.) If you do not have
access to a welder and your car is running before performing this conversion, consider driving your car
to a qualified exhaust shop to have this bung welded in before beginning installation. This will prevent
you from having to remove a section of your exhaust to carry to the shop later on.
NOTE: If you drive the car with the bung welded in before performing the conversion, be sure to
install the included O2 plug to cap off the bung instead of the oxygen sensor. Installing the oxygen
sensor without it being connected to power will prevent it from being heated and will cause carbon to
build up which can damage the sensor element.
Other parts you might need:
FAST™ engineers have worked hard to ensure that your new EZ-EFI
®
kit includes everything you will
need to perform the conversion with basic tools found in most shops. However, certain applications
may require extra parts not included that you may want to purchase before beginning. Check out the
list below and consider if any of these apply to your application.
Fuel injection-rated fuel system – As with all modern fuel injection systems, the EZ-EFI
®
requires a
much higher pressure fuel system than carbureted applications do. For this reason, you will need to
install a new fuel injection-rated fuel system in your vehicle. If you purchased a 30401-KIT or 30402-
KIT 55 Master Kit, or one of the FAST™ fuel kits, then you have everything you need to make the
switch.
“T” fittings for the vacuum system – The EZ-EFI
®
throttle body provides two 3/8" and one 1/8"
manifold vacuum ports and one 1/8" ported vacuum port. (Ported vacuum ports do not provide a
vacuum signal at idle.) If the carburetor being removed from your vehicle utilized more than this
number of ports, you may require a barbed T fitting of the appropriate size to multiply the number of
ports available on the EZ throttle body. If you will be running a return-style fuel system (explained in
the “Fuel System Types” section below), be aware that the fuel pressure regulator will require an 1/8"
vacuum port.
Carburetor flange adapter/intake manifold – The EZ-EFI
®
throttle body is designed to bolt onto
manifolds with a four barrel, square bore carburetor flange (such as is utilized by a 4150-style
carburetor). If your manifold is set up for any other style carburetor, realize that you will either need a
carburetor adapter or a new manifold.