Author Topic: Fuel Tanks Cracking  (Read 359 times)

0 Members and 1 Guest are viewing this topic.

Offline Honda Hoarder

  • Novice
  • *
  • Posts: 33
    • View Profile
Fuel Tanks Cracking
« on: January 11, 2020, 09:47:03 PM »
I have had a few fuel thanks crack lately, they had unblocked breathers and the fuel caps were loose.
Some of the tanks had not had fuel in them for some time

So does anyone have any tips to stop this. 


Thanks

Offline TT5 Matt

  • Legend
  • *****
  • Posts: 1491
    • View Profile
Re: Fuel Tanks Cracking
« Reply #1 on: January 13, 2020, 12:18:33 AM »
id say the plastic has dried out greatly reducing its flexibility a lot and todays fuel with lots of ethanol leaches polimers (spellin)out of the plastic. Brentj on here wouldn't buy a plastic tank unless the seller was prepared to fill the tank full with fuel for 2 weeks to see if it was going to crack and lots of guys who sanded/polished their old tanks only for a lot of them to crack on the 1st outing. sometimes your better to buy a new Clarke tank.

Offline Honda Hoarder

  • Novice
  • *
  • Posts: 33
    • View Profile
Re: Fuel Tanks Cracking
« Reply #2 on: January 14, 2020, 05:57:40 AM »
Thanks for the reply

Brought a Clarke tank for my 84 CR 500 and it's crap, the colour is way off and the fitment is shit also $$$$


Going to do a few tests

Put another 84 tank in a clip lock tub with 3 small tins of pre mix fuel around it.
Think after a week I'll spray the outside of the tank with pre mix in a Wurth bottle
Also after another week thinking of a fuel soaked rag stuffed inside the tank




Offline David Lahey

  • Legend
  • *****
  • Posts: 954
  • Gladstone, Queensland Australia
    • View Profile
Re: Fuel Tanks Cracking
« Reply #3 on: January 14, 2020, 11:32:36 AM »
Dungar Pilot on this forum treated a ~1984 plastic Italjet trials bike tank by immersing the whole thing in a big metal tank of petrol. From memory I think it was successful
http://www.trials.com.au/forum/viewtopic.php?f=16&t=4785&hilit=italjet&start=2000
previous pseudonym feetupfun

Offline geoff

  • C-Grade
  • **
  • Posts: 60
    • View Profile
Re: Fuel Tanks Cracking
« Reply #4 on: January 14, 2020, 10:27:11 PM »

I have filled plastic fuel tanks that have been stood for many months with engine oil to the filler and left for another month. Emptied the oil out and filled up with pre-mix and up to now no problems.
I know if tanks are left empty for any length of time they do crack and usually along the fuel level in the tank.