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Old 06-20-2011, 11:36 AM
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Did I Ruin My Vacuum Gauge?

After pulling my distributor and trying to reset the timing this weekend, I had some backfires thru the carb before I got things dialed in correctly. Once it was all running, I noticed that my nice new Ultra Lite vacuum gauge was completely dead. It wouldn't budge at all. I assume one of those backfires killed it.

Has anyone else ever had this happen?

I would say this is a good lesson learned: The next time I'm starting an un-timed engine, unplug the vacuum gauge!

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Old 06-20-2011, 01:24 PM
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That would depend on the quality of the gauge. Where did you have the gauge connected to? The inner diameter of most vaccum gauges is 1/8"", for a backfire to put any positive pressure on the line to the gauge it would have to be a hell of an explosion.

My vaccum gauge (45 years old) sucks and shows vacuum on the dial to 30 lbs, it will also show positive pressure up to 10 lbs for reading fuel pump pressure. Will yours do the same as mine?
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Old 06-20-2011, 02:56 PM
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This wasn't a hand-held tester, it was an in-dash gauge. It doesn't show boost, and it was connected to the full manifold vacuum port in the baseplate of the carb.

I think this is it...
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Old 06-20-2011, 08:48 PM
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If it has a pin, like the one in the picture, it can't be reversed. Contact Autometer and see what kind of warranty policy they have.
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Old 06-26-2011, 09:00 AM
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More likely you blew the hose feeding the gauge.
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