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Diagram B– Piggyback example (for CIS)
71404
M8–1.00 x M12–1.50
male w/ o-ring
14. Deactivate fuel pump and relieve fuel system pressure. With key
press
valve. If your tester has no
release slowly. (A
15. Remove tester and reconnect all lines.
16. Start engine and check for leaks.
17. Remove fuel from all hoses. Fuel additives and ethanol can damage hoses and seals
gauge hose assembly, connect the smallest banjo bolt adapter into the quick coupler over an approved fuel
container. Hold gauge above hose and depress the
CAUTION: If components of this kit are used with a canister cleaner for injector cleaning, they must
be cleaned before storage. Due to the corrosive nature of cleaning
left in hoses and adapters will damage o-rings, hoses and seals. To ensure tool life, the
hose and fuel system test adapter must be
remove the cleaning
Basic Instructions for Testing GM TBI
Please consult the vehicle service manual, a Mitchell Fuel Injection manual
or Robert Bosch Service Guide regarding pressure test results.
To test:
1. Relieve fuel system pressure.
2. Remove air cleaner assembly.
3. Temporarily plug the Thermac vacuum port on the throttle body.
4. Using the adapters we supply, install the tester in line between the fuel
(Diagram C).If longer pieces of 3/8˝ hose are needed, cut from 3/8˝ fuel line. Use hose clamps on hose.
In some instances, the adapters may have to be piggy-backed in order to get the right combination of
threads to connect. (See Diagram D).
5. If steel tubing is removed, use two wrenches to prevent damage.
6. On some cars, it is easier to put the car on a lift and test from underneath.
7. On some cars with GM TBI systems, it is hard to install adapters. With the
adapters and tubing furnished, many combinations can be made to help you.
8. Reactivate fuel pump, start the engine and check for leaks.
9. When fuel pressure has stabilized after a minute or so, gauge
should read 9–13 PSI (62–90 kPa),(.6–.9 bar), and (.63–.91 Kg/cm2).
10. Deactivate fuel pump, and relieve fuel system pressure. With key
and press
and release slowly. (A
Gauge and hose
assembly
71408
Connecting hose and
valve assembly
assembly can be purchased from your tool distributor.)
valve. If your tester has no
assembly can be purchased from your tool distributor.)
M8–1.00 female x M12–1.50 male
, put
valve assembly, wrap rags around connections and
valve. Fuel will ow into the fuel container.
with fresh gasoline after each use to
, put
valve assembly, wrap rags around
4
English
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tubing in a fuel can and
.
If fuel remains in
, any cleaning
and the throttle body
tubing in a fuel
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