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Old 09-15-2021, 02:03 AM   #1
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Default Exterior fresh water tank leak

I went to fill my exterior fresh water tank and noticed a small leak. It is streaming out of a small crack at about the 9 o'clock position above the drain. It is hard to see but is a light tan color about 3/8" long. It was not leaking last month before our 1100 mile trip. Has anybody had a similar leak and what did you do to fix it? I was thinking of drilling a hole at each end of the crack to stop it from growing. I am not sure what to use to seal it so it won't leak.
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Old 09-15-2021, 02:58 AM   #2
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I would drill and tap a hole (10-32?) at the end furthest from the drain pipe. It looks from the picture that the close end is at the thread in the tank. If so, I would leave it alone.

Then I would clean the surface, apply some epoxy or urethane sealer to the area, and cover it with a piece of flat metal drilled for and secured with a stainless screw in the tapped hole, taking care not to strip the plastic threads.
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Old 09-15-2021, 02:09 PM   #3
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Go to a body shop as they deal with plastic all the time. They will know what to use to seal/repair the plastic tank. IMHO, do not drill into the tank as this will cause more problems down the road.
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Old 09-15-2021, 02:57 PM   #4
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I saw this guy on tv, he said that Flex Seal would fix anything like that.
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Old 09-15-2021, 03:20 PM   #5
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Quote:
Originally Posted by Bud View Post
I saw this guy on tv, he said that Flex Seal would fix anything like that.
Just to be sure, I would confirm that claim with Some Guy on the Internet.
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Old 09-15-2021, 05:08 PM   #6
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Just to be sure, I would confirm that claim with Some Guy on the Internet.
avanti, I tried that but even after 25+ years of internet, well ymmv......

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Old 09-15-2021, 06:02 PM   #7
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The tank looks like olefin plastic (polyethylene, polypropylene…); they are resilient to any glue. My suggestion would be a well welded bead of an olefin welding rod. Most plastic tanks manufacturers have plastic welding equipment for plastics. Doing yourself with a hot air gun can be done with some practice.

https://www.harborfreight.com/plasti...ure-96464.html
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Old 09-16-2021, 02:22 AM   #8
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Update, I took the drain fitting out today and the crack is the shows in the threads. The picture although not very clear you can see a light color tan line is the crack at the 9 o'clock position. Not sure what to do at this point but GeorgeRa seems to suggest a good fix. Thanks to everyone who helps.
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Old 09-16-2021, 02:46 AM   #9
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Drilling current bulk head fitting and welding a new one could be your best option. Search locally for a "Plastic Welding" shop.
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Old 09-16-2021, 12:16 PM   #10
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Quote:
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Drilling current bulk head fitting and welding a new one could be your best option. Search locally for a "Plastic Welding" shop.

Yep, and it will be probably be an easier, more reliable, repair than trying to route out an old dirty crack and weld it.
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