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Implement Alley Discussion Forum

Diesel fuel tank repair

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LE Smith (West

10-05-2006 10:10:09




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The (steel) diesel fuel tank on my Ford 7810S has developed a stress crack where the fuel shut off valve screws into the bottom of the tank. Looking to take an easy route to fix I picked up some NAPA "Metal Repair Compound". Does this sound like a good idea or should I bite the bullet, pull the tank and have it brazed? It is a very slow seeping type of leak rather than a drip that you can actually watch and see where it comes from. Thanks for any input.

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LE Smith

10-09-2006 09:15:07




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 Re: Diesel fuel tank repair in reply to LE Smith (West Central MI, 10-05-2006 10:10:09  
Thanks everyone for the great ideas. Now I have to get with the program and get it fixed before it gets cold and snows - here in MI by Thu and Fri (10/12-10/13)!!!!



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MarkB_MI

10-08-2006 06:35:16




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 Re: Diesel fuel tank repair in reply to LE Smith (West Central MI, 10-05-2006 10:10:09  
There is a polysulfide sealant known generically as "Pro-Seal" that is used for sealing aircraft fuel tanks. It is very tough and slightly flexible, making it ideal for repairs where the parts need to flex.

You can obtain Pro-Seal from various aircraft supply houses, including Wicks and Aircraft Spruce.

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JMS/MN

10-07-2006 13:13:44




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 Re: Diesel fuel tank repair in reply to LE Smith (West Central MI, 10-05-2006 10:10:09  
As an afterpost to the one below- if vibration is a problem that might comprimise a repair- remove some steel line and replace it with a section of hose, to damper any vibration.



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JMS/MN

10-07-2006 13:11:46




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 Re: Diesel fuel tank repair in reply to LE Smith (West Central MI, 10-05-2006 10:10:09  
Had a similar leak on a Gleaner F2 tank maybe 8-10 years ago. Tried patching, did not work- took off the tank, dried, ground off multiple spot welds for internal baffles- used JB weld on it. Still have the combine, don't use it often, but still no leaks in the diesel tank.



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davpal

10-05-2006 21:09:40




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 Re: Diesel fuel tank repair in reply to LE Smith (West Central MI, 10-05-2006 10:10:09  
I had a 4-150 white that had a crack in the bottom of the fuel tank. I happened to be down to worthingtons ag parts in St Johns and they had a real nice tank for a 4-180 that had Zero leaks for $150 dollars. It made the choice really easy. Call them up and see if they have a nice tank for your Ford. I would bet they do or can get one. In a few hours you can change one out and a lot of times those tractor salvages have a lot better stuff than you think. Some of their combines, (well, most of them !) look better than ours and a lot of the tractors just get retired because they become useless to the farmer and too expensive to fix. Good luck, changing a tank is a lot easier and better than trying to fix one. Somebody had already fixed mine once and it was still leaking again. Good luck.

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paul

10-05-2006 18:23:33




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 Re: Diesel fuel tank repair in reply to LE Smith (West Central MI, 10-05-2006 10:10:09  
Two spot welds on the baffle in my lower tank on the Ford 7700 began leaking, oh, 15 & 8 years ago.

I got the 2-part black/white makes grey epoxy that says it is for fuel tank repair (looks a _lot_ like JB Weld) and haven't had to redo them since.

Don't know if it will work on a joint that flexes tho.

--->Paul



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mjbrown

10-05-2006 10:29:08




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 Re: Diesel fuel tank repair in reply to LE Smith (West Central MI, 10-05-2006 10:10:09  
Due to the oily nature of diesel fuel you will have trouble getting anything to stick where it has been. Having it brazed would be better. I would be real hesitant to try it because the heat will fog residual fuel which is then explosive.



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Fighting suburbia in NC

10-05-2006 11:14:08




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 tank repair tips in reply to mjbrown, 10-05-2006 10:29:08  
To keep the tank from going boom you can always empty it then run the business end of a steam cleaner into the fill neck and let it pump steam into the tank while it is being brazed. That said, I watched a local repair shop braze a diesel fuel tank with fuel in it not too long ago. They would braze a place then slosh the fuel to that area to see if it leaked. Look like some pretty soft brass rod he was using and with the size tip his torch had it did not take but just a second to get the brass to flow. Still, he was using a dirct flame on a flammable material, but it worked for him. YMMV.

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