Splitting a gas tank?

1959 - 1978, M151, M151A1, M151A2, Technical questions and discussions, regarding anything related to the M151.
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redcoat54th
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Splitting a gas tank?

Post by redcoat54th » Sun Jul 08, 2018 2:14 pm

Has anyone ever split the two halves of the gas tank to effect repairs/cleaning? If so. how best to tackle the project? Thanks, Bob
British Army (Royal Signals). US Army 1st Air Cav (UH1H pilot)
Prime mover 1965 M151A1
Trailer M416
MVPA #37617

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redcoat54th
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Re: Splitting a gas tank?

Post by redcoat54th » Sun Jul 08, 2018 4:48 pm

To answer my own question I cut around the seam with a thin cut off blade in the grinder after soaking the tank with water for a few days. Do not want to go boom. I did not cut the area under the filler because of accessability - I was able to hinge it open without any problems. The baffle is made up of two parts: one welded to the top and one to the bottom. Thus I was able to pry the tank open without the baffle causing problems. In this picture you can see areas of rust at the top of the tank where you cannot normally see or get to. This is especially true on the side of the tank behind the baffle.
I have 4 to 5 pin hole leaks in the tank so I thought I would experiment with patching up the old tank rather than shelling out for a new one. The plan might be to acid clean the rust, weld the holes and coat with a tank liner material.
tank1.jpg
tank1.jpg (120.12 KiB) Viewed 607 times
Here is the top underside of the tank on the filler side.
tank2.jpg
tank2.jpg (139.68 KiB) Viewed 607 times
Here is a close up of the pinholes and badly pitted area. The pinholes show up as the white dots.
tank3.jpg
tank3.jpg (146.6 KiB) Viewed 607 times
Hope this is of help and shows the layout of the tank internals. Bob
British Army (Royal Signals). US Army 1st Air Cav (UH1H pilot)
Prime mover 1965 M151A1
Trailer M416
MVPA #37617

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Re: Splitting a gas tank?

Post by Rickf » Sun Jul 08, 2018 5:28 pm

Nice job, That should be pretty easy to weld back together, especially if you are Tigging it.
1964 M151A1
1984 M1008
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Re: Splitting a gas tank?

Post by bartman762 » Mon Jul 09, 2018 5:34 am

Interesting photo......
I just pulled my tank and ran “One Batch” of tank liner to seal & Reline all the mess.
That was about 5 years ago......
I installed a Tractor Sediment Bowl in-line plus a Fuel Filter.
Sediment bowl catches most any remaining Junk in tank. I change disposable filter once a year.
So far so good......
But your way looks a lot better!
Bartman

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Kurt Lesser
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Re: Splitting a gas tank?

Post by Kurt Lesser » Mon Jul 09, 2018 10:08 am

When I rebuilt an M37 years back I found a radiator shop with a large caustic tank that hot dipped my gas tank for me. The tank came out spotless and then I used a can of military tank sealer that I had to finish it up. Today the caustic tanks are still out there but harder to find and I would recommend a product like POR15 as a sealant. I think this is a much better solution than trying to do this job at home with caustics or acids.
Kurt Lesser
US Navy, 1969-1975
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W. Winget
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Re: Splitting a gas tank?

Post by W. Winget » Mon Jul 09, 2018 11:17 am

I used Caswell,
https://www.caswellplating.com/epoxy-ga ... aler.html#
I did a write up about it several years back (5 years?), costs about $70, (you need two of their small kits for the jeep sized fuel tank) it's a two part clear epoxy, I haven't had an issue with chipping, leaking, pealing, etc. just cleaned the tank out with hot water and crystal type drain cleaner, rinsed it a few times, taped up the holes from the outside and the gas gauge hole, poured it in, rotated every way I could turn it, dumped out excess (into the bottom well of my GPW tank sump floor) then blew air through the line fitting and removed the cap (it got coated in that stuff too, hasn't hurt to have it protected).
Can't rave about it enough, a product that does what it says and keeps working.
V/R W. Winget
Looking for 1918 Standard B 'Liberty' truck parts

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redcoat54th
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Re: Splitting a gas tank?

Post by redcoat54th » Tue Jul 10, 2018 8:34 am

Thanks for all the replies. I am acid cleaning now to expose all the pin holes. From the outside the tank looked VERY solid only to reveal that a layer of rust and paint was the only thing holding off multipal gas leaks. Not something I need if I'm away for the weekend. The plan is to do some welding and patching prior to a good coating of tank sealer to complete the job. I will coat most of the tank before welding the two halves togeter - leaving a 3" untreated area around where the welds will be. I plan to seal the seam area after everything has cooled down. Pictures to follow as I progress. Bob
British Army (Royal Signals). US Army 1st Air Cav (UH1H pilot)
Prime mover 1965 M151A1
Trailer M416
MVPA #37617

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Re: Splitting a gas tank?

Post by bartman762 » Tue Jul 10, 2018 8:35 am

Redcoat,
It seems most of us have Non-Working Fuel Gauges and the New Replacement Fuel Guages on the Market do not work very well. . I have been toying with an Idea on a Retrofit.
Since your tank is apart, what is the depth of the Tank from Top to Bottom.
Also the diameter of the Fuel Gauge hole in the Top of the Tank.
I’m about 1200 miles from my own Gas Tank for I would measure myself.
Bartman

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redcoat54th
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Re: Splitting a gas tank?

Post by redcoat54th » Tue Jul 10, 2018 9:10 am

bartman762 the hole for the sending unit is 1 1/2" dia and the tank total depth is 8 1/2" I would knock off 1/2" for the area above the sending unit and fuel pickup/fuel pump flanges. Bob
British Army (Royal Signals). US Army 1st Air Cav (UH1H pilot)
Prime mover 1965 M151A1
Trailer M416
MVPA #37617

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redcoat54th
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Re: Splitting a gas tank?

Post by redcoat54th » Tue Jul 10, 2018 9:18 am

Acid cleaning unerway. Using Muratic acid full strength. Wear gloves and work in a well ventilated (outside) area. The fumes are tocix, stay upwind (use a fan).
P1140672.JPG
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P1140674.JPG
P1140674.JPG (144.56 KiB) Viewed 548 times
The area of worst pitting was at the TOP of the tank where it is hard to see.
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P1140673.JPG (149.25 KiB) Viewed 548 times
British Army (Royal Signals). US Army 1st Air Cav (UH1H pilot)
Prime mover 1965 M151A1
Trailer M416
MVPA #37617

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Hell On Wheels
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Re: Splitting a gas tank?

Post by Hell On Wheels » Wed Aug 22, 2018 5:25 pm

I tip my hat to your efforts :D just better off just spending the money to buy a new one if your going to keep it. To many man-hours involved equates to just it's cheaper buying it. There are a few things you just can't be cost effective, "Brakes, Fuel supply, Combustion and Safety"
Robert

1966 - M151A1
1986 - M998
2007 - M1102
2009 - H3T

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redcoat54th
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Re: Splitting a gas tank?

Post by redcoat54th » Thu Aug 23, 2018 6:46 am

Hell On Wheels while I agree 100%, I have more time than money. Next step is to weld in a few patches on the inside and tack the holes over on the outside to the new metal. I'm asking around to see if I would be better off leaving the inside bare metal as 100% of the rust and rot has been eliminated. 50/50 on how a liner treatment will hold up in the long run. Bob
British Army (Royal Signals). US Army 1st Air Cav (UH1H pilot)
Prime mover 1965 M151A1
Trailer M416
MVPA #37617

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Hell On Wheels
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Re: Splitting a gas tank?

Post by Hell On Wheels » Thu Aug 23, 2018 7:08 am

I was in your position and did some research on the liners and had some good sources in the states and good feedback but decided to go the buying route
Robert

1966 - M151A1
1986 - M998
2007 - M1102
2009 - H3T

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