Posted by Chris Jones on February 01, 2013 at 13:53:20 from (98.26.240.6):
I've seen this on a few small engines before--the fuel filter (little clear plastic inline type) is almost completely full of air yet things still run fine. My current engine has a large tank beside the engine and a vacuum operated fuel pump separate from the tank and engine. The pump has a vacuum line from the engine to it as well as a fuel in an fuel out lines. I have the filter on the suction side and have clamps on all the lines. It's a new filter and lines. I used a small funnel to completely fill the filter and lines with gas. I managed to get all but a couple little bubbles out of the filter. The lines were full. Now I look at it and I can see fuel in the filter on the outlet side of the paper element in there but there appears to be none on the input side. There is plenty in the tank and the engine runs fine for as long as I want it to. Unfortunately I can't watch the filter with the engine over idle but at idle I can't see fuel coming into it. What causes this and is this normal or a problem or what. I'm considering moving the filter to the output side of the pump. What do y'all recommend.
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