I have a hand-operated vacuum pump/gauge for testing purposes and brake fluid changes. It has lost its ability to pull a vacuum, apparently because the plunger part no longer seals against cylinder walls. How can I fix this? Should I try using cooking oil or silicone spray? I'm concerned that cooking oil might cause deterioration in any rubber parts.
automotive vacuum pump
in Test & Measurement
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I have a hand-operated vacuum pump/gauge for testing purposes and brake fluid changes. It has lost its ability to pull a vacuum, apparently because the plunger part no longer seals against cylinder walls. How can I fix this? Should I try using cooking oil or silicone spray? I'm concerned that cooking oil might cause deterioration in any rubber parts.