fuel evaporates upward. pour some in a small dish and watch closely. the vapors rise. with an open bowl vent, the vapors rise toward the opening, and eventually, the filter is emptied.

I really think there's a conspiracy from the gas company's. Evaporates faster, your tank emptys faster. Back in the day we used Cam 2 purple, cell would be dry for the next race so we would drain and back in the 55 gal drum. Later we tried the higher octain blue, stayed in cell, didn't evaporate. Came in cheaper since we didn't lose any from evap.

I don't think a whole filter, and fuel line will do that in an hour or less. I put a new pump on and it quit that.

all gone in less than an hour, you have a problem. glad a pump fixed it.

Had that happen on a Jeep. Shut the engine off and you could watch the filter empty out.

After all these years I still can't get water to drain uphill after the spring melt. I should put a carb in the low spot on my yard because according to so many guys carbs are great at getting liquids to reverse the affects of gravity! Kidding aside, at first glance to a lot of people it seems like the fuel is draining back when the problem is in fact evaporation. Ever put a jerry can of fuel in your trunk on a hot day? Come back later on and it's blown up like a balloon from, imagine what happens in your carb where the bowl vents are open to atmosphere.



Same here. I can't think of any good reason to mess around with a mechanical pump these days.