What sealant on petrol tank?

Just tried some expensive black stuff to seal my smelly/weeping fuel sender. Within 40 miles its blocked up my fuel filter making the bugger kangaroo embarassingly when even it gets some revs.

So what to use instead?

BTW: It was a new gasket but leaked up through the screws and was enough to give you a headache and see monsters when stuck in a traffic jam!

Blue Hylomar is supposed to be fuel resistant - I've used it on fuel tank gaskets without any problems.

blue instant gasket is bloody bomb proof

Don't use rtv sealant it goes all stringy and fooks up everything!!

Isn't the gasket a cork type ? Just use a little grease on it

I had originally, but after a few weeks it starts leaking petrol round the screw threads, it was more something to seal them up. I've done it up with blue and it seems better now.

I also found some red I beleive that is supposed to be better on petrol but it seems to be petrol soluble - might be the ethanol thats in petrol now, it says on the packet to remove excess with meths...