Anti-siphon valve?
Jorge-
After I put a Racor filter and vacuum gage on my ETEC I found I was at or near the vacuum limit even with a brand new fuel filter. I had replaced the fuel tank a few years before and had used the original 90 degree elbow on the top of the tank. I discovered it was also an anti-siphon valve. So I drilled out the elbow to remove the ball and my vacuum dropped in half. I routed the fuel line with an increase in elevation so it would not siphon if there was a downstream leak. I did not experience your problem, but thought it was worth mentioning. Good luck
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