I would check the diaphragm inside the isolator to make sure it is pushed to the fuel side of the can. It is not unheard of for a tiny leak on the gauge side to let it go far enough over that it will not read correctly. You can use the eraser end of a pencil to put a little pressure on it to move it where it belongs. Unfortunately you have to drain it to do that and I found that to be a real pain although Eric had some way of doing it that was easier than what I did. Can't recall how it was done but I would call him to find out. Personally I hate those things and have mine plumbed directly to the gauge with a small valve turned tight enough to not let the needle bounce. Just the way I did mine which many do not care for.
Russ RothMember Since 26 May 2012
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Class 8 diesel trucks and diesel Pickups, old cars, Pickups and tractors, fishing, hunting, travel
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