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Old 07-25-2018, 08:17 PM   #21
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Good job. It looks like a tough job. I had a tank replaced in a previous boat. They cut out the steel tank and made a custom fiberglass tank. Had to cut out the back of the cabin to get the new one in but it was a beauty. Good luck and keep us informed.
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Old 07-25-2018, 10:30 PM   #22
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Did you find the root cause of the leak? Mine was from 35+ years of moisture on the outside bottom of the tank.

I used a coal tar epoxy to coat the exterior of the new tank before installation. Its very thick and sticky, but I highly recommend it.
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Old 07-25-2018, 11:43 PM   #23
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Looks like (photo#5) there was actually a low point drain fitting right behind the pickup/return lines, was there a valve installed there?
If so, its use could have saved your tanks.
Thanks for the photos, a grim reminder that tanks need regular maintenance.
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Old 07-26-2018, 01:55 AM   #24
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Definitely install drain valves at the very bottom and install the inspection ports immediately too.

I just replaced all my poop hoses with schedule 40 PVC pipe. Permanent and cheap. NO y-valves, only on/off valves. Install with threaded couplers every section or every few feet so you can unscrew and remove the various assemblies. Works great. Oh, install two vent lines to the poop tank for that spring freshness a happy poop tank can provide.

I don't know your boat model but it might be a good time to investigate a fuel chest with a recessed filler and an overflow drain that drains back to the tank?
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Old 07-26-2018, 02:48 AM   #25
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Did you find the root cause of the leak? Mine was from 35+ years of moisture on the outside bottom of the tank.

I used a coal tar epoxy to coat the exterior of the new tank before installation. Its very thick and sticky, but I highly recommend it.
The bottom inside weld seam had a very small crack at one of the support stringers. There was no way to get to it. I am familiar with coal tar. I am inclined to let the aluminium breath. Years down the road coating can lift and set up corrosion if moisture enters.
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Old 07-26-2018, 06:31 AM   #26
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Thanks for showing this!
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Old 07-26-2018, 09:28 AM   #27
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Make sure the tanks are made from a 5000 series alloy and DO NOT PAINT.
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Old 07-26-2018, 10:35 AM   #28
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Single or twin engine?
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Old 07-26-2018, 11:05 AM   #29
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Make sure the tanks are made from a 5000 series alloy and DO NOT PAINT.
Thanks, my research also cam up with don't paint or coat.
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Old 07-26-2018, 11:06 AM   #30
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Single or twin engine?
Twin 6bt 210 Cummins
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Old 07-26-2018, 03:28 PM   #31
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Yep, been there done that ! I refitted with S/steel, carefully welded in place WITH a sump drain sludge/water drain. Don't even mention the price but I reckon Stainless is Painless.

Hey ! S'cuse me guys the jobs crappy enough without mentioning 'Wheated Bourbon' HUH ! try 10 year old Bushmills Irish Whiskey and don't even think about contaminating it with ice cubes or water.
Jeez the very thought would make a grown man cry.
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Old 07-26-2018, 04:41 PM   #32
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Hey ! S'cuse me guys the jobs crappy enough without mentioning 'Wheated Bourbon' HUH ! try 10 year old Bushmills Irish Whiskey and don't even think about contaminating it with ice cubes or water.
Jeez the very thought would make a grown man cry.
Sorry but I have a taste for the Wheats. I may try your Bushmills it sounds good by the review.
BTW why does Irish whiskey need American Oak barrels to age. Don't you have white oaks across the pond?
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Old 07-26-2018, 04:49 PM   #33
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Triple M Plastic products will custom weld plastic tanks.
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Old 07-26-2018, 05:02 PM   #34
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Is welded plastic legal for fuel tanks?

I was under the impression that fuel tanks must be linear PU, which is difficult or impossible to weld. You normally see these rotomolded. Non-linear PU can be welded for water and waste tanks.
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Old 07-26-2018, 06:08 PM   #35
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A read through the ABYC standard H-33 (diesel fuel systems) says that non-metallic tanks such as fiberglass can be used but must pass the same tests as other materials. No specific reference or exclusion of plastic. Manufacturer claims their tanks meet minimum USCG Standards:

Triple 'M' Plastics » Custom Fabrication

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Is welded plastic legal for fuel tanks?

I was under the impression that fuel tanks must be linear PU, which is difficult or impossible to weld. You normally see these rotomolded. Non-linear PU can be welded for water and waste tanks.
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Old 07-26-2018, 06:12 PM   #36
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Does anyone have plastic tanks in their boat? I have read a lot of threads on TF that mention the use of replacement poly tanks, but I have not found anyone who has done it.
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Old 07-26-2018, 06:19 PM   #37
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Here is a blog of my fuel tank replacement photos if it helps.

Saving Tortuga: Fuel Tank Removal and Replacement
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Old 07-26-2018, 06:47 PM   #38
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Here is a blog of my fuel tank replacement photos if it helps.

Saving Tortuga: Fuel Tank Removal and Replacement
Thanks, I have studied your great blog several times. Thanks for sharing.
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Old 07-27-2018, 07:35 AM   #39
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Er Fridaze, they actually use barrels from Portugal.
C'mon give our exports a boost and buy some 10 yr. old Black Bush, or even some Millennium, when you've tried Black you won't go back and i'm talking strictly whiskey here.
Like any drink its a matter of personal choice but try a wee drop any way, you will enjoy it, the wheat is Irish grown and the water is from a local spring.
During the prohibition they kept making whiskey and so it matured until prohibition was lifted. America's Kennedy family were keen to smuggle it via Canada.
Bushmills is the oldest licensed whiskey distillery in the world
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Old 07-27-2018, 06:32 PM   #40
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https://www.powerandmotoryacht.com/....s-on-your-boat
Interesting read on fuel tank materials. I think it's to early for me to try plastic tanks. They do sound promising.
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