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PAGE 28 —DRY PRIME PUMP — OPERATION MANUAL — REV. #3 (10/06/08)
Dry Pump Vacuum Test
To perform the pump vacuum test do the following:
1. Perform all start-up steps without installing the hoses.
2. Block the suction with a plug or heavy rubber flap as
shown in Figure 12. An accurate vacuum gauge should
be installed in the plug or flap to check vacuum system
performance and pump vacuum gauge.
2. Start the engine and run at 1,800 RPM. Note the
maximum vacuum reading.
3. Shut off the engine and check the vacuum reading. The
vacuum reading should be .75 to .9 Bar or 25 to 27
inches. Vacuum reading should hold for about 3 to 10
minutes before dropping to zero. If vacuum reading drops
fast, check for leaks and repair if necessary. Listen for
leaks. If area is quiet, small air leaks should be easy to
hear.
MAINTENANCE (PUMP)
-15
-30
-10
-5
in. Hg
kPa
WIKA
R
-100
-80
-60
-40
-20
PUMP VACUUM TESTER
25 IN. HG TRANSLATES
INTO 25 FEET OF LIFT
AT SEALEVEL.
PLACE VACUUM TESTER
OVER PUMP INLET.
-25
-20
ACCEPTABLE READING
SHOULD BE BETWEEN
-27AND -25 IN. HG.
(In. Hg = INCHES
OF MERCURY)
PUMP VACUUM
TESTER
Engine Maintenance
To ensure longer pump life and service, please follow the
pump maintenance guidelines as listed in Table 6 and on
preceeding pages.
Figure 12. Dry Pump Vacuum Test
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