Thread: 89 300e: How can I be sure it's my fuel pump thats bad
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Old 05-01-2005, 01:49 AM
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G-Benz G-Benz is offline
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Join Date: Apr 2001
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MB put two pumps to provide sufficient pressure (and eliminate vapor lock).

Normal pumps hiss when working properly. A "buzzing" pump indicates impending failure.

You may be able to "feel" which pump is buzzing versus which one is operating normally. But an automotive stethoscope would give you absolute info.
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