Quote:
Originally Posted by dieseldan44
The lift pump is plumbed after the secondary filter (as opposed to before it), so that assembly is under vacuum as opposed to pressure.
My question really revolves around if the engine goes on a 50 mile trip just fine, and then has air upon restart, does that definitively indicate an air leak?
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And that is exactly where your problem is! You can't do that without modifying the filter mounting bracket. You are drawing air into the system from the fuel return line, through the secondary filter bleed hole. You need to block it.