Shouldn't the fuel filter eventually fill up with gas? I just put on a new fuel pump and I see the amount of air in it rising and falling over a period of several days. This seems to me almost like the pump is injecting air into the line?

Thanks

No.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Hmm, the fuel filter on my Volare (between the fuel pump and the carbs) is mostly full of fuel whenever I look at it. It's a clear plastic filter.
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"Ja, Ich fahre ein altes auto."
'78 Volare 225
'67 Charger 318

If the fuel filter is partly horizontal, the air bubble can't escape. But how much air stays in there will depend on the mounting angle.

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"Mad Scientist" Matt Cramer
'66 Dart - turbocharged 225
My blog - Mad Scientist Matt's Lair