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1998 Mariner gas tank removal (video)

Anything related to the operation of your boat. Steering, Bilge Pumps, thru-hulls, bottom paint, etc.
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Topic author United States of America
Wkuhilltopperfan
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Posts: 65
Joined: January 10th, 2016, 2:47 pm
Vessel Info: 1998. Mariner 350 . Twin 7.4 engines / kholer 6.5 gas Genset
Location: Nashville, TN
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Re: 1998 Mariner gas tank removal (video)

Postby Wkuhilltopperfan » April 1st, 2016, 8:25 pm

Viper wrote:Source of the post For the benefit of those with the same model, are you able to post some pics of the bad areas on the tanks so they're aware of potential issues they may face in the future. Also curious, what does the tank normally sit on, just a platform? If so, I'd consider something that would allow the bottom to breath/dry out.

Unfortunately because I was rushed trying to get back to work, I had to drop the tank off at the repair shop without time to look over it for myself. For the quick look over I got to do , it seemed to have 2 small rust looking spots on the bottom near the middle of the tank. The tank was so dirty it was hard to tell. I requested that the repair shops please take some photos since I was doing a documentary of the repair process (hope they do). I'll be out of the country until the 12th of April, I will be picking the tank up from being repaired when I return. I will make sure to do as many photos as possible and describe the problems that was found. The tank sits on a wood platform that appeared to become brittle which probably led to the issue at hand. I will be installing a 1/4 inch rubber liner down before I reinstall the tank for extra protection.
1998 350 Mariner

User avatar

Topic author United States of America
Wkuhilltopperfan
Deck Hand
Deck Hand
Posts: 65
Joined: January 10th, 2016, 2:47 pm
Vessel Info: 1998. Mariner 350 . Twin 7.4 engines / kholer 6.5 gas Genset
Location: Nashville, TN
Has thanked: 17 times
Been thanked: 18 times

Re: 1998 Mariner gas tank removal (video)

Postby Wkuhilltopperfan » April 1st, 2016, 9:00 pm

Viper wrote:Source of the post For the benefit of those with the same model, are you able to post some pics of the bad areas on the tanks so they're aware of potential issues they may face in the future. Also curious, what does the tank normally sit on, just a platform? If so, I'd consider something that would allow the bottom to breath/dry out.

I'll be out of the country until April 12th. When I return I will being doing the last video which will include everything you requested. But to answer a couple questions real fast...... The tank sits on a plywood platform that has become brittle and rotted ( probably led to the issue at hand) I will insert a 1/4 inch rubber pad under the tank when I put it back in. I have asked the Metal fabrication shop to do some photos of the bad areas ( I hope they do so). I will show how the repair was done and post as much as I can about the process.
1998 350 Mariner
User avatar

Topic author United States of America
Wkuhilltopperfan
Deck Hand
Deck Hand
Posts: 65
Joined: January 10th, 2016, 2:47 pm
Vessel Info: 1998. Mariner 350 . Twin 7.4 engines / kholer 6.5 gas Genset
Location: Nashville, TN
Has thanked: 17 times
Been thanked: 18 times

Re: 1998 Mariner gas tank removal (video)

Postby Wkuhilltopperfan » April 1st, 2016, 9:59 pm

I will do. Might take a week or two, I'm leaving the country until April 12th and I'm going to do the tank install when I return
1998 350 Mariner
User avatar

Topic author United States of America
Wkuhilltopperfan
Deck Hand
Deck Hand
Posts: 65
Joined: January 10th, 2016, 2:47 pm
Vessel Info: 1998. Mariner 350 . Twin 7.4 engines / kholer 6.5 gas Genset
Location: Nashville, TN
Has thanked: 17 times
Been thanked: 18 times

Re: 1998 Mariner gas tank removal (video)

Postby Wkuhilltopperfan » April 2nd, 2016, 6:41 pm

I will
1998 350 Mariner
User avatar

Topic author United States of America
Wkuhilltopperfan
Deck Hand
Deck Hand
Posts: 65
Joined: January 10th, 2016, 2:47 pm
Vessel Info: 1998. Mariner 350 . Twin 7.4 engines / kholer 6.5 gas Genset
Location: Nashville, TN
Has thanked: 17 times
Been thanked: 18 times

Re: 1998 Mariner gas tank removal (video)

Postby Wkuhilltopperfan » April 2nd, 2016, 6:45 pm

Sorry everyone.... I iPad had a glitch and acted like my post wasn't going through
1998 350 Mariner
User avatar

Topic author United States of America
Wkuhilltopperfan
Deck Hand
Deck Hand
Posts: 65
Joined: January 10th, 2016, 2:47 pm
Vessel Info: 1998. Mariner 350 . Twin 7.4 engines / kholer 6.5 gas Genset
Location: Nashville, TN
Has thanked: 17 times
Been thanked: 18 times

Re: 1998 Mariner gas tank removal (video)

Postby Wkuhilltopperfan » April 13th, 2016, 9:37 pm

I'm picking my fuel tank up tomorrow from the machine shop, they never could find the leak ( which sucks) I have a feeling the cold winter temps allowed the tank to being leaking wherever the bad spot was. I had them make a complete new bottom and weld all the way around the tank. I will upload photos / video soon
1998 350 Mariner

Canada
Viper
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Re: 1998 Mariner gas tank removal (video)

Postby Viper » April 14th, 2016, 6:49 am

Before installing it, I would pressurize it first. Get a gauge on it, pressurize, leave it for a few hours and check if the pressure has dropped. You don't need much pressure, maybe 5-7lbs. After you pressurize it, spray all your connections with soapy water and look for leaks to ensure a drop in pressure isn't due to you rig. If there is a drop in pressure, spray all the welds and suspect areas of the tank to reveal the leak.

I always test repaired tanks first. I did have one that looked great at the new welds but pressurizing revealed a pinhole in the new weld. Would have been a real pain if I went through all the trouble of installing it only to have to remove it again as it involved engine removal.
User avatar

Topic author United States of America
Wkuhilltopperfan
Deck Hand
Deck Hand
Posts: 65
Joined: January 10th, 2016, 2:47 pm
Vessel Info: 1998. Mariner 350 . Twin 7.4 engines / kholer 6.5 gas Genset
Location: Nashville, TN
Has thanked: 17 times
Been thanked: 18 times

Re: 1998 Mariner gas tank removal (video)

Postby Wkuhilltopperfan » April 14th, 2016, 3:03 pm

The machine shop did a 70lbs test (crazy). With the tank soaped up and never got a bubble
1998 350 Mariner

Canada
Viper
CYO Supporter
CYO Supporter
Posts: 4428
Joined: July 10th, 2015, 9:58 pm
Vessel Info: 1989 Carver 3807 Aft Cabin
Location: Ontario, Canada
Has thanked: 292 times
Been thanked: 1085 times

Re: 1998 Mariner gas tank removal (video)

Postby Viper » April 14th, 2016, 8:27 pm

W, just putting this out there everyone's benefit; the people that did the repair I mentioned, also tested at their facility before I took delivery! As a result (of the leaker I found after the fact), I check every tank I get repaired now even if they tested already.
User avatar

Topic author United States of America
Wkuhilltopperfan
Deck Hand
Deck Hand
Posts: 65
Joined: January 10th, 2016, 2:47 pm
Vessel Info: 1998. Mariner 350 . Twin 7.4 engines / kholer 6.5 gas Genset
Location: Nashville, TN
Has thanked: 17 times
Been thanked: 18 times

Re: 1998 Mariner gas tank removal (video)

Postby Wkuhilltopperfan » April 24th, 2016, 6:46 pm

Well boys and girls..... I did the best video I had time to do with a busy schedule but I hope it helps the next person in line. So here is video #3 . I will also update the original post to include all three videos

https://youtu.be/8J_9EP9Dc-o
1998 350 Mariner

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