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Old 06-09-2015, 08:09 PM   #1
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Angry Over Filled Fresh Water Tank

I over filled my tank on my Cruiser this afternoon. Broke the supports below. It also buckled the floor. Has anyone seen or heard of this happening before? I have filled this tank about 5 times in the past never had a problem.
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Old 06-09-2015, 08:47 PM   #2
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This is a pretty common issue, and not just with CR products. On my '04 Cruiser I had to 'improve' the fresh water tank. The factory uses flat metal straps (3) and a piece of plywood. The combo of too few straps and too thin plywood is just a problem waiting to happen. Anyway, it was too difficult to replace the plywood, so I replaced the flat straps with 1" square steel tubes, (but like 6 or 7 tubes) that were screwed into the cross-member supports. Never had another problem with the tank sagging.

I never travel with a full tank. Instead I leave home with just 10-15 gallons and then fill the tank at the campground.
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Old 06-09-2015, 09:54 PM   #3
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If it broke the supports below AND buckled the floor above you may have over pressured the tank and it expanded like a balloon. The fresh water tank is supposed to be gravity fed slowly so the air in the tank can escape as water enters.
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Old 06-09-2015, 10:00 PM   #4
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This can happen if you fill too fast. The fill hose blocks the input hole and the vent can't keep up with the increasing pressure as the tank fills. If the tank can't release the air and water especially near the point of almost full then a rupture can occur. I fill mine 1/2 to 2/3 and then stop, let the vent pressure "catch up" and then fill the remainder slowly. I also did what Larry did and added heavier plywood support plus added two more 2" "C" channel steel bars bolted to the frame. No more sagging plywood.
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