Outer Limits 4x4 Board

Is the a silicone that is good for fuel? Ive tried quite a few different ones and haven had much. Ive tried the red one but it never seems to dry, a black one that smells terrible and dosent seem to hod either. Normal blue max turns to snot and blocks everything.[/quote]

Can I ask what you plan on using it on?

I was always told not to put silicon anywhere near fuel. Can you make a gasket to do the job?

We use grey automotive coon at work on everything, never really had a problem with it, dont know where or if you could buy it as its packaged in-house.

Im using it around my drop in fuel pump and filler on to a custom stainless tank

cant you just make a gasket for it...as far as i know (may not mean much)there isnt really a silicone that will seal for fuel as a gasket...there is thread sealer that works for fuel for bungs etc..it is a white gooey crap but wont do what you want

i didnt look on the weekend but how does your filler bolt in to the tank

dave

Yeah as far as silicone sealants for fuel, theres not much you can use effectively. There is a sealant that is poored into a tank and sloshed around (after thorough cleaning) to seal tanks but thats not going to be any good in this application. If your filler and fuel pump are flanged then your best option is to get some cork neoprene gasket material and cut it to suit.

Like this: http://www.specialtyautomotive.net/cat/?op=sp&id=305

Otherwise, Goss makes a good rubber gasket material that suits petrol and diesel. Also comes in a roll and would need to be cut out. From memory there is a few thickness choices, 1.6mm, 2.4mm and 3mm. Its called Goss Handy Sheet, Nitrile Fabric Reinforced. Any Goss agent (most parts shops) should be able to order it in for you if they dont have it on the shelf. It looks like rubber sheet and is basically what most efi vehicles use as gaskets on their tanks.

The pump has a rubber gasket on it but the tank gets a woop inbetween the screws becouse th tank is only 1.2mm thick. I might have to weld a thick ring of steel to where the pump bolts down

three bond grey is proably the best you will get.
a mate I raced bikes with used it to seal his fast fill jerry can seems to work ok . bursons sell it. Ktm use it to seal all gasket faces block up on their motors its good shit to have even it it doesn't work on fuel.

i had the same problem the bloke at autopro said Loctite No3 non-hardening sealant was the go i put it on both sides of the rubber gasket and it hasnt leaked for about 3 weeks now

Petrol and silicone do not like each other. Petrol will melt the silicone, unless there are new specialized products on the market you need to use a gasket and rubber is perfect for sealing on a fuel tank.

So you need to weld a ring on.

- David.

Dirty wrote:Petrol and silicone do not like each other. Petrol will melt the silicone, unless there are new specialized products on the market you need to use a gasket and rubber is perfect for sealing on a fuel tank.

So you need to weld a ring on.

- David.

Ditto. And if the silicone gets into the fuel supply it "balls" and can clog carby jets, injectors etc.

9holes wrote:i had the same problem the bloke at autopro said Loctite No3 non-hardening sealant was the go i put it on both sides of the rubber gasket and it hasnt leaked for about 3 weeks now

I'm facing the same problem. Does this stuff definitely work with petrol and not dissolve?