7045 fuel tank
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=179399
Printed Date: 26 Jul 2025 at 8:44pm
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Topic: 7045 fuel tank
Posted By: AllisandGleaner
Subject: 7045 fuel tank
Date Posted: 28 Mar 2021 at 9:40am
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We’ve got a 7045 and have noticed the bottom portion of the tank was getting wet over time so took a look under there and where the metal pipe goes into the plastic tank there is a crack in the plastic. Is there anything like sealer or epoxy that can be used to patch it? Though about trying to find a used one just it’s now 40 years old and would possibly occur the same problem.
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Replies:
Posted By: Michael V (NM)
Date Posted: 28 Mar 2021 at 10:47am
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jus throwing this out there,,, Would an earlier metal tank work?,,, if ya got all the matching brackets and such?? no, i don't have one,,, just a suggestion...
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Posted By: bigal121892
Date Posted: 28 Mar 2021 at 10:49am
The last time I had to patch one, agco, had a patch kit for them. If they no longer have them, then I would check with an auto-parts store.
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Posted By: AllisandGleaner
Date Posted: 28 Mar 2021 at 1:53pm
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Checked on the AGCO website and it shows the kit was no longer available. Any pointers about what to look for at the parts store hate to say it but no one around here knows the slightest about what they sell or what’s what these days. Only thing I hate about putting a metal one on is the possibility of rust rest of the tanks in good shape just that hairline crack at the fitting.
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Posted By: DougG
Date Posted: 28 Mar 2021 at 2:40pm
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Theres all kinds of sealers etc out there now which will buy you time , and a hairline crack in the fitting ??? Is the fitting replaceable ???? And then if its the fuel tank the plastic is getting old and will crack more later - id seal it up best you can and run it !
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Posted By: Roach
Date Posted: 28 Mar 2021 at 4:18pm
If it was mine I would grind out a portion of the crack and use a hot air plastic welding gun with some compatible plastic weld rod. Have done many other tanks that way. Everything from washer fluid to chemical tanks. Never tried a fuel tank but should work.
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1937 WC, 1948 G,1954 CA,1956 WD45, 1967 D17, 1937 M crawler, 1963 D-19, 1966 190XT, 1967 D-15, 1948 HG42 Cletrac, 1955 G456 Terra Trac, CAT 10 1928 and CAT 22 1938
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Posted By: AllisandGleaner
Date Posted: 28 Mar 2021 at 6:48pm
It had been a while since I looked at the fitting so after Doug’s post I thought it would be wise to refresh my memory. It’s not the actual fitting that’s leaking it’s right beside the hole that’s in the tank where the fitting goes it’s in a half moon shape following the insert/hole. It appears that something hung the line and pulled it down at some point in time causing it to crack.
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Posted By: K bockting
Date Posted: 28 Mar 2021 at 8:26pm
My 8010 poly fuel tank was leaking. Tried everything patches
melting back together nothing lasted. Replaced with good used from salvage yard.
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Posted By: HD6GTOM
Date Posted: 30 Mar 2021 at 12:06am
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NAPA has a kit to repair those tanks. They have to be empty and real clean. I've done several over the years. I was given a 1000 gallon plastic tank to hold calcium. My trailer does not have fenders on it, tank slid over into a tire. Rubbed a big hole in it, over 20 years ago. With their kit, Its still holding today. I don't know any part numbers for them, I just go in and ask for 1. We are lucky, our NAPA has been here owned by the same family since the 1920's.
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Posted By: nick121
Date Posted: 02 Apr 2021 at 6:22am
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I've had luck with using fiberglass resin to repair tanks. Take the time and prepare it by sanding and cleaning it really good.
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Posted By: AllisandGleaner
Date Posted: 03 Apr 2021 at 7:41pm
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Hopefully going to get the tank off in the next week or two then clean it up and try and see which route I want to try.
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Posted By: AllisandGleaner
Date Posted: 12 Apr 2021 at 8:14pm
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Okay so I got the tank off the other day and in attempt for a more permanent fix I used a straight soldering iron to melt the crack back together and also added some more material surrounding the fitting to complete a 1 inch reinforced area around fitting mixing it in with the tank as I went. I’m pretty sure the leak is stopped I’ve sloshed the fuel around let it sit for a few minutes on that side and I haven’t seen any yet(currently is sitting overnight with fuel in it for the final test before reinstalling) There was just one thing that I’m not 100% satisfied with and that’s where I built up around the fitting due to fact that the metal and plastic won’t bond together. So I’ve searched for an epoxy that is fuel resistant and will work with both polyurethane and metal and have come up empty handed there is plenty of plastic weld/bonders out there but when you call and ask if they will stick to polyurethane they tell you a quick no. Ive called JB weld as well as quick steel and neither offer a product suited for this application going to try loctite tomorrow and see what they say. Just if anyone has any suggestions on a product that will work I would greatly appreciate it. The tank may be fine without it just gonna add something else on there for precautionary measures as fuel is on the rise.
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Posted By: shameless dude
Date Posted: 12 Apr 2021 at 9:55pm
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remember to put padding behind the straps that hold the tank. maybe put a piece of carpet under the tank on the shelf.
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