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John Deere Tractors Discussion Forum
Show Parts for Model:

4020 fuel drain leak ?

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Heavyduty1

11-20-2012 11:24:19
66.87.2.211



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My 4020 was leaking at the fuel tank drain valve, so I replaced the drain valve with a new one from deere. It still leaks, seems to be leaking down the threads. I've tried some pipe thread tape but it still has a steady leak. Anyone else run into this?
I'd hate to have to take that tank out. Also, the original axle has been replaced with a 4430 front end and the axle mounting plate under the tank doesn't leave alot of wiggle room. I could only get 1/8 turn on the wrench. She's old and doesn't owe me a thing, so no cussing was used. Well maybe a couple. :lol:
This post was edited by Heavyduty1 at 11:33:31 11/20/12.

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Ken11487

11-25-2012 16:06:39
64.66.236.28



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 Re: 4020 fuel drain leak ? in reply to Heavyduty1, 11-20-2012 11:24:19  
I sand blasted mine and coated it with fiberglass body repair stuff. Worked great. Got the idea from an RV guy next door, worked on his RV too.



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grey

11-25-2012 15:50:47
168.215.117.180



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 Re: 4020 fuel drain leak ? in reply to Heavyduty1, 11-20-2012 11:24:19  
My 4520 did the same thing. I pulled the tank out and a large part of the bottom was rusted badly. I had a machine shop cut the bottom out and make a new 3/16 steel bottom for it with a new threaded hole. I paid 150.00 for the repair and put a new piece of heavy duty rubber underneath to replace the old foam padding. It worked great and was a lot less than a new tank. It should be good for another 50 years.

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DEEREMEYER1

11-21-2012 18:13:58
71.50.25.139



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 Re: 4020 fuel drain leak ? in reply to Heavyduty1, 11-20-2012 11:24:19  
Tim S probably nailed it. Pinhole in the bottom of the tank due to rust and corrosion. Seen more than one that way.



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Heavyduty1

11-20-2012 17:36:17
66.87.2.213



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 Re: 4020 fuel drain leak ? in reply to gemdozer, 11-20-2012 11:24:19  
Quoting Removed, click Modern View to see

Thanks for the info, jddave. I was planning on using Permatex high-temp thread sealer but it's red. You think the Permatex white paste would be a better choice?



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jddave

11-20-2012 17:17:38
67.84.199.220



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 Re: 4020 fuel drain leak ? in reply to Heavyduty1, 11-20-2012 11:24:19  
Very important that you seal the threads on the shut-off valve as fuel will weep down and leak otherwise. I use the high-temp thread sealant Permatex white paste-type stuff from NAPA. They say it's fuel resistant. Install and let set for a couple days. Some say teflon tape is not fuel resistant. Likewise as Tim said there could be rust through at the bottom of the tank if there was water at the bottom for an extended period of time. Best way is to pull the tank and inspect it. Those little leaks will drive your crazy.

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Heavyduty1

11-20-2012 13:18:40
66.87.2.211



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 Re: 4020 fuel drain leak ? in reply to Couv, 11-20-2012 11:24:19  
That's a good idea. :idea: Looks like the tank needs to come out to fix it proper. I think I'm going to try that when I take the tank out and get the threads 100% dry. Then check it with a shop vac for leaks.

If that don't work, I'm going to put a bolt in and weld a bead around the bolt head and tank.
This post was edited by Heavyduty1 at 13:22:22 11/20/12.



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Mike M

11-20-2012 13:01:54
24.140.0.120



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 Re: 4020 fuel drain leak ? in reply to Heavyduty1, 11-20-2012 11:24:19  
If it is the threads ? and not the tank I'd use some hardening permetex sealer on the threads.Have it clean and dry (hard to do I'm sure ) and let set up before refilling.



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Heavyduty1

11-20-2012 12:49:20
66.87.2.211



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 Re: 4020 fuel drain leak ? in reply to Heavyduty1, 11-20-2012 11:24:19  
Thanks for the reply tim s and TX Jim.
$450 for a tank, I don't know. I might just have that tank drain hole welded closed if the threads are messed up from rust. I would still be able to drain most of the tank from the fuel supply line valve that goes to the filters. :wink:



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Tx Jim

11-20-2012 12:32:02
67.142.163.23



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 Re: 4020 fuel drain leak ? in reply to Carlyle Hoffman, 11-20-2012 11:24:19  
Abilene Machinery http://www.abilenemachine.com/john-deere-tractor-parts-fuel-tanks/

New Fuel Tank

Part Number: AMAR39587

Applications: 4000, 4010, 4020

Replaces OEM Part Number AR39587



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Heavyduty1

11-20-2012 12:14:54
66.87.2.211



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 Re: 4020 fuel drain leak ? in reply to Heavyduty1, 11-20-2012 11:24:19  
If I find several leaks or I can't fix this one. Would it be wise to go ahead and replace the tank, since it's almost 50 yrs old? Anyone other than john deere, have these tanks?



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Tim S

11-20-2012 11:43:28
75.60.207.71



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 Re: 4020 fuel drain leak ? in reply to Heavyduty1, 11-20-2012 11:24:19  
There is a strong chance there is a rust hole and draining down past the shut off,,it"s not that bad to take out, remove it and cap the holes, using a "clean" shop vac with the hose on exhaust duct taped to the fill hole, a squirt bottle with dawn and water to check for leaks...



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