2
Operating Instructions and Parts Manual
27167
10/18
2018 OEM
®
FUEL PRESSURE
TEST KIT
FUEL PRESSURE TESTER COMPONENTS
1. Rubber Boot: Boot is used to protect gauge and
maintain appearance.
2. Dial Face: Contains measurement scales that show
amount of fuel pressure present in fuel system.
3. Pressure Relief Button: Used to relieve fuel pressure in
gauge hose before disconnecting gauge hose from fuel
rail.
4. Bleed-Off Hose: A 6 Ft. hose that bleeds off fuel
pressure when pressure relief button is pressed. Never
use a bleed-off hose shorter than 6 Ft.
Important: Always make sure end of bleed-off hose is in
an approved container for fuel at all times during testing
and when bleeding off fuel pressure!!
5. Gauge Hose: Hose that carries fuel to the gauge, so
that pressure can be measured.
6. Chrysler/GM Test Port Adapter: Adapter is used to
connect gauge hose to GM, Chrysler and other vehicles
equipped with a Schrader valve test port on fuel rail.
7. Ford Test Port Adapter: Adapter is used to connect
gauge hose to Ford vehicles equipped with a Schrader
valve test port on fuel rail.
8. GM TBI Test Adapter: Adapter is used to connect
gauge hose to GM TBI vehicles NOT equipped with a
Schrader valve test port.
9. M12 X 1.25 Banjo Bolt Adapter: Adapter is used to
connect gauge hose to Asian, European and select
domestic vehicles equipped with fuel Banjo Bolt
Connections.
10. Dual Manifold Test Adapter: Adapter is used to
connect gauge hose to vehicles with rubber hose
connections on the fuel rail, fuel line or fuel filter.
FUEL INJECTION SYSTEM THEORY
There are two basic types of fuel injection systems cur-
rently being used. The first type is called “port” or “multi-
port” fuel injection. In this system, fuel injectors spray fuel
directly into intake manifold behind intake valve. These
systems typically have one fuel injector per cylinder. The
second type is commonly called Throttle Body Injection
(TBI) for GM and Chrysler vehicles or Central Fuel Injec-
tion (CFI) for Ford vehicles. These systems use one or two
fuel injectors mounted on top of intake manifold. They
spray fuel into throttle body similarly to a conventional
carburetor.
