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PAGE 18 — QP2E CENTRIFUGAL PUMP • OPERATION AND PARTS MANUAL — REV. #0 (02/12/09)

MAINTENANCE

PUMP VACUUM TEST

To perform the pump vacuum test do the following:

Remove the pump ﬁ ll cap (Figure 2), and ﬁ ll the pump 1.

with water.

Start the engine as outlined in the initial start-up 2.

section, and wait for the pump to begin pumping.

As shown in Figure 11, place a water hose inside 3.

the discharge opening of the pump, and turn on the

water. This ﬂ ow of water into the discharge opening

will prevent the pump from running dry.

Place the Pump Vacuum Tester (P/N 7000030) over 4.

the pump suction (inlet) opening (Figure 11) with the

vacuum gauge facing upwards. It may be necessary to

apply a small amount of water around the rubber seal

of the vacuum tester to make a good suction ﬁ t.

Check and make sure that there are no air leaks 5.

between the vacuum tester and the inlet port on the

pump. If air leaks are present reset vacuum tester.

Run the pump for a few minutes while monitoring the 6.

vacuum gauge. If the gauge indicates a reading

between -25 and -20 in. Hg. (inches of mercury) then

it can be assumed that the pump is working correctly.

CAUTION

DO NOT attempt to start the engine unless the pump

has previously been primed with water. Severe pump

damage will occur if pump has not been primed.

NOTICE

25 in. Hg (inches of mercury) translates into 25 feet of

lift at sea level.

If the vacuum tester gauge indicates a reading below 7.

-20 in. Hg, it can then be assumed that the pump is

not functioning correctly, and corrective action needs

to be taken.

To test the ﬂ apper valve, shut down the engine. The 8.

vacuum tester should remain attached to the pump

suction inlet port by vacuum. This indicates the pump's

ﬂ apper valve is seating properly to hold water in the

suction hose when the engine is stopped. This prevents

backﬂ ow and allows for faster priming when the engine

is restarted.

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MULTIQUIP QP2E Spécifications Page 18