Polaris 850 MATRYX INDY XC 129 2021 Manual page 368

FUEL SYSTEM
12. Mix a ratio of approximately 10 parts water to 1 part
dish soap in a squeeze bottle or paper cup. This
solution will serve as your leak detector.
13. Attach the proper size hose to allow a Mity-Vac as
seen below (or equivalent pressure pump with a low-
pressure scale) to be connected to the fuel tank vent
fitting. The image below shows the Mity-Vac
assembled with optional Schrader valve
faster pressurizing of fuel tank.
Optional Schrader valve shown below.
5.36
14. Pressurize the tank to 5 PSI. The tank will change
shape when pressurized. This is normal.
volume hand pump to pressurize it can take a very long
time. The attachment of an air valve stem in-line with
the pressure supply line will allow the use of a larger
Q
to allow
considerably reduce the amount of time required to
reach 5 PSI. Use the optional Schrader valve listed in
pump, be sure to monitor the pressure on the gauge
15. Saturate the PFA nut area with the soap solution.
16. Inspect for leaks under the PFA nut, around the top
perimeter of the pump flange, around the base of the
fuel fittings, and around the plastic wire pass-thru on
top of the PFA. There may be bubbles present from
the initial application of soap solution. These bubbles
can be popped by lightly blowing on them. Watch for
new bubbles forming. Bubbles formed can be very
small, so look closely. Apply additional soap solution
during inspection if needed.
17. If there is a leak, slowly release the pressure from the
tank. Check the PFA nut torque and repeat pressure
test. If leak is still present, a new tank assembly will
be required.
18. If no leaks are detected, the tank assembly is
adequately sealed and ready for installation into the
snowmobile.
19. Complete the installation process by following the
Fuel Tank Installation procedure.
9850064 R03 - 2021 650 / 850 Matryx Trail Performance / Crossover Snowmobile Service Manual
NOTICE
The fuel tank has a large volume, and using a low
volume pump (i.e. bicycle tire pump). This will
the tools list, if desired. If you use a larger volume
constantly so that 6 PSI is never exceeded.
IMPORTANT
DO NOT USE SHOP COMPRESSED AIR
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