Never had any water problems in several years, but after replacing a cap (SPRL) and some freezing rain a lot of water appeared in the left tank. Put the old cap back on and sumped the tank till all was clear (took about 4 test tubes full of water to get clear). The problem is that some water seems to remain in the tank even after sumping. With the tank sumped and clear of water, after a short flight (or in one case, just taxiing), sumping shows 1-2 in of water in the test tube. Get rid of the water, take another flight and the water is there again. This has happened 4 times with the same fuel load over a couple of weeks. If I let it sit for a few days after sumping, there's no water in the tube, so it seems the motion of flying the airplane causes water to flow down to the sump.
Is this normal for RV tanks (these are QB) after a lot of water has entered?
Is this normal for RV tanks (these are QB) after a lot of water has entered?