SPX LeakMaster - Phase Two; Phase Two: Smoke Leak Detection

9
Phase Two
1. Verify the vehicle’s fuel level is below the base of
the fuel tank neck.
2. Position the selector valve on the tester to SMOKE.
See Figure 8.
3. Remove the vehicle’s fuel cap.
ThissavestimewhenllingtheEVAPsystemwith
smoke.
4. Press the remote starter button to activate the tester.
The “ON” indicator light will come ON after a
5-second self-diagnostic delay, indicating the tester
is ON and producing smoke.
5. Replace the fuel cap once smoke is seen exiting the
fuel tank’s neck.
ThetimerwillautomaticallyturnOFFinveminutes.
ToshutthetesterOFFbeforetheveminutesareup,
simply press the remote button.
6. Continue to introduce smoke into the EVAP system
for about 60 seconds, or until the ow meter’s ball
stops descending.
It is not necessary to wait until the system is full
(indicatedbythedescendingowmeterball)before
looking for leaks.
7. Use the spotlight provided to follow the EVAP
path and look for smoke exiting a leak. Continue to
introduce smoke in 30 second intervals until the leak
is found.
This ON/OFF technique allows the EVAP system to
achieve test pressure, and then allows the pressure to
be relieved. Diagnostic Smoke
®
vapor is even more
visible at lower test pressures.
You could also use a UV light (not provided) to search
for the UltraTraceUV
®
dye that would be deposited
at the exact location of the leak(s). The longer the
EVAP system is allowed to fill with Diagnostic
Smoke
®
vapor,themoreuorescentmaterialwillbe
deposited.
8. Repair the leak(s), and perform the Phase One test
again to verify the repair and make certain there are
no additional leaks in the EVAP system.
9. Reinstall the vehicle’s Schrader valve using a
counterclockwise thread rotation (OBD vehicles
only). Reinstall the EVAP service port green cap.
Figure 8
Tech Tips
• For an even quicker test procedure, it is
possible to combine Phase One and Phase
Two. Theowmeterisoperationalinboth
phases.
If you already know the EVAP system has a
leak, start with Phase Two testing. (The leak
willstillbequantied,becausetheowmeter
is active.)
Then perform Phase One to verify the repair.
• If you are testing a vehicle that has a fuel roll-
over valve in the fuel tank, you may not see
smoke exiting the fuel tank neck.
You may need to introduce smoke through the
fuel tank neck, and vent the non-smoke air out
the vehicle’s service port; or at least partially
llthesystemwithsmokebeforeclosingthe
vent solenoid. Then, once smoke is seen exiting
the vent area, close the vent solenoid.