Engine Related Parts
13
Testing the roll over valve
The roll over valve vent has two functions. The first
function is to vent the tank and the second function is to
close off the vent if the tank is inverted.
Test the roll over valve by:
1. Remove the roll over valve by following the steps pre-
viously described in this section.
2. Connect a vacuum pump to the roll over valve.
3. Hold the roll over valve in an inverted position.
4. Apply a vacuum to the roll over valve.
See Figure 2.15.
NOTE: The roll over valve should hold 15 in.Hg. for 15
seconds.
5. With the vacuum still applied, turn the roll over valve
over. See Figure 2.16.
NOTE: The vacuum should be relieved.
6. If the results do not match what is listed above,
replace the roll over valve.
Figure 2.15
15 in.Hg.
Figure 2.16
Zero reading
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