Steel gas tank repair

Dab · July 9th, 2014, 05:46 PM

I have a crack in my gas tank which someone already tried to fix with cheap flex seal... Was thinking of brazing it shut but everyone says it won't work any tips?

Dab · July 9th, 2014, 05:52 PM

The crack is from tip to tip of the tools and is about 1mm wide

alex.s · July 9th, 2014, 05:54 PM

the problem is that the inside will continue to rust and will start clogging up the fuel filter / carb jets

Dab · July 9th, 2014, 06:09 PM

It's not rusted out the bikes been dropped on that side and the bolts sticking out now and not flush like the other side. but I could use a inner tank coater to deal the inside once it's shut but want to know if it'll braze because on a bunch of other sites they say you can't

Motofool · July 9th, 2014, 07:11 PM

Quote:

Originally Posted by Dab

I have a crack in my gas tank which someone already tried to fix with cheap flex seal... Was thinking of brazing it shut but everyone says it won't work any tips?

Any steel can be glued together with enough heat and cleanness of the surfaces; the real problem is the danger of explosion, which is high even when the interior has been cleaned.

Please, please, do not attempt doing it yourself; a good shop should know how to do it safely: I have seen it done many times, .... and I have known of some explosions as well.

If you must do it yourself, do not use a live flame, use a solder iron and soft solder, after cleaning the surface and inside the crack (and inside the tank if possible) absolutely well.

Dab · July 9th, 2014, 07:58 PM

I would clean the tank out with compressed air removing any remaining vapours and while doing any heating I would have a line bleeding nitrogen into the tank so ignition won't be possible

crazymadbastard · July 9th, 2014, 08:07 PM

Quote:

Originally Posted by Dab

I would clean the tank out with compressed air removing any remaining vapours and while doing any heating I would have a line bleeding nitrogen into the tank so ignition won't be possible

Sounds like a plan.

flitecontrol · July 9th, 2014, 08:31 PM

When you get ready to seal the inside of the tank, this is the stuff to use. Infinitely better than Kreem, Red Kote, etc. If I were you, I'd drill two small holes at the end of the crack to prevent any further cracking, tape over the crack, and then just use the Caswell. It strengthens the tank as well as sealing it. http://www.caswellplating.com/restor...nk-sealer.html

Motofool · July 9th, 2014, 08:40 PM

Quote:

Originally Posted by Dab

I would clean the tank out with compressed air removing any remaining vapours and while doing any heating I would have a line bleeding nitrogen into the tank so ignition won't be possible

Please don't do it.

Although the most of air is nitrogen, pure N2 (28.0 g/mol) is lighter that air; hence, you will have O2 trying to sneak into the cavity.

accumack · July 9th, 2014, 08:58 PM

I would look for a used tank in good condition.

July 9th, 2014, 05:46 PM	#1
Dab ninjette.org member Name: Adam Location: Sardis Join Date: Jul 2014 Motorcycle(s): 1996 ninja 250 Posts: 49	Steel gas tank repair I have a crack in my gas tank which someone already tried to fix with cheap flex seal... Was thinking of brazing it shut but everyone says it won't work any tips?

July 9th, 2014, 05:54 PM	#3
alex.s wat Name: wat Location: tustin/long beach Join Date: Sep 2009 Motorcycle(s): wat Posts: Too much. Blog Entries: 5 MOTM - Oct '12, Feb '14	the problem is that the inside will continue to rust and will start clogging up the fuel filter / carb jets __________________________________________________

July 9th, 2014, 08:31 PM	#8
flitecontrol ninjette.org guru Name: Lee Location: Monroe, LA Join Date: Feb 2014 Motorcycle(s): Rebel 250s, Ninja 250s VN750s (currently nine total) Posts: 465	When you get ready to seal the inside of the tank, this is the stuff to use. Infinitely better than Kreem, Red Kote, etc. If I were you, I'd drill two small holes at the end of the crack to prevent any further cracking, tape over the crack, and then just use the Caswell. It strengthens the tank as well as sealing it. http://www.caswellplating.com/restor...nk-sealer.html
	1 out of 1 members found this post helpful.

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July 9th, 2014, 06:09 PM	#4
Dab ninjette.org member Name: Adam Location: Sardis Join Date: Jul 2014 Motorcycle(s): 1996 ninja 250 Posts: 49	It's not rusted out the bikes been dropped on that side and the bolts sticking out now and not flush like the other side. but I could use a inner tank coater to deal the inside once it's shut but want to know if it'll braze because on a bunch of other sites they say you can't

July 9th, 2014, 07:58 PM	#6
Dab ninjette.org member Name: Adam Location: Sardis Join Date: Jul 2014 Motorcycle(s): 1996 ninja 250 Posts: 49	I would clean the tank out with compressed air removing any remaining vapours and while doing any heating I would have a line bleeding nitrogen into the tank so ignition won't be possible

July 9th, 2014, 08:58 PM	#10
accumack ninjette.org member Name: jim Location: texas currently in Temecula Valley CA Join Date: May 2013 Motorcycle(s): honda crf230l & 2013 ninja 300se wife has Honda crf230l & honda cbr250r repsol Posts: 222	I would look for a used tank in good condition.