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Old 01-16-2017, 12:35 AM   #54
Capt.Bill11
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"I may be missing something, but it seems to me that regardless of flow rate, vacuum is vacuum. It seems to me that whether your fuel pump is moving 50 GPH or only 5 gph, as the filter gets clogged there will be resistance: vacuum. I am not sure why flow rate would change the vacuum. Perhaps someone here can explain it to me."

You you might be right. Perhaps I probably didn't word it correctly.

So maybe it's the fact that on some engines the fuel pump doesn't seem to pull a strong vacuum or something.

All I know is I've seen clogged elements where the gauges seemed to be OK but it didn't read significant vacuum even though the element was clogged enough to cause the engine to stumble.
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