Quote:
Originally Posted by twistedtree
And this is why you need to keep the cross over line open.
I too would check your vent lines. A low spot in a vent line that gets flooded with fuel from an overfill will block the vent and cause all sorts of problems. It's easy to test by opening the fuel fills for both tanks, turning them into vents, and see if they balance out. I had this exact issue with interconnected water tanks on another boat
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Another reason to check is because it's the simplest to fix problem. I always try to start there when gremlins creep aboard our boat, because, well, it's the easiest and might save me a bunch of unneeded head scratching and labour.
Surprisingly often, it is the simplest fix that solves an issue.