sealant for petrol tank

Submitted: Sunday, May 17, 2009 at 23:15

ThreadID: 68935 Views:6457 Replies:6 FollowUps:2

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V8 Troopie

I would appreciate if anybody could tell me the name of a sealant that can be used with petrol.
Its to seal the little plastic tank of a small (3.5Hp) outboard motor at the filler fitting. I tried some sealant stuff I had but it goes soft in contact with petrol, what I'm after should set hard and provide some mechanical strength (to stop the fitting unscrewing itself when I unscrew the cap).
Thanks

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Reply By: Richard Kovac - Sunday, May 17, 2009 at 23:25

Sunday, May 17, 2009 at 23:25

when I built house boats we used a product call STAG it is a red in coluor pasty type stuff come in a can with a screw on lid and brush.

but I built house boats in the 80's

Richard

AnswerID: 365446

Follow Up By: Richard Kovac - Sunday, May 17, 2009 at 23:35

Sunday, May 17, 2009 at 23:35

FollowupID: 633156

Reply By: Willem - Monday, May 18, 2009 at 04:07

Monday, May 18, 2009 at 04:07

That Blue and White putty that you knead to get a consistent grey colour will plug up a hole in a petrol tank. I did that once on my old LC tank in Gregory NP when I holed it on some Karst.

Cheers

AnswerID: 365452

Reply By: toyocrusa - Monday, May 18, 2009 at 06:11

Monday, May 18, 2009 at 06:11

Hi. If the fitting is a screw thread then Loktite make some products that would be suitable.Have a look on their website. Regards,Bob.

AnswerID: 365458

Reply By: Ozhumvee - Monday, May 18, 2009 at 07:22

Monday, May 18, 2009 at 07:22

It is very hard to seal cracks in plastic that have had fuel on/in them.
Same goes for plastic cooling system parts that have been around coolant etc.
The best way would be to clean it completely with something like acetone, forcing it well into the crack and then blow dry with compressed air.
Then get it plastic welded which is the only 100% reliable way to repair it.
If welding is unavailable then one of the fuel tank epoxies specifically made for plastic tanks would be the next best method.
The problem is that it is probably in a location that is flexed as you take the cap on and off which will further flex it and lead to possible failure of the epoxied joint.
If gluing it try to do the initial repair and then rough the outside of the tank to give further applications a chance to grip and layer it to build up the strength.

AnswerID: 365462

Reply By: wild dog - Monday, May 18, 2009 at 07:43

Monday, May 18, 2009 at 07:43

Used Stag for 40+ years, don't know of anything else to do the same job.
Whatever you do don't use any of the silastic products, you'll be cleaning out your carburettor forever.

AnswerID: 365464

Reply By: wallabyjack5 - Monday, May 18, 2009 at 10:51

Monday, May 18, 2009 at 10:51

I have'nt tried this on petrol tanks,but could be a bit of useful info if you get stuck.
Inredents. Black Boy {Grass Tree} sap
Dry Kangaroo dung
Charcol from cold camp fire
Grind all separetley into a powder,heat up a stick over a fire dip into sap until it starts to melt mix then with dung and charcol making a goo.Continue until you have the required amont to do your job.You can then use it to as a putty to fill holes,stick broken taps back into drums etc.Keep away from heat though.
Regards
Glyn

AnswerID: 365483