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Thread size on fuel tank taps
Posted: Sat Apr 15, 2023 6:45 pm
by BrianDowning
I am coating the inside of the tank to guard against rust and I'd like to plug the tap holes with bolts to ensure that the treads are not coated too. The Whitworth bolts I have do not have the fine threads that the taps have. Are they Whitworth and what size bolt would work?
Regards, Brian
Re: Thread size on fuel tank taps
Posted: Sat Apr 15, 2023 7:13 pm
by Groily
BSP always, 1/8th normally.
Re: Thread size on fuel tank taps
Posted: Sat Apr 15, 2023 7:25 pm
by BrianDowning
Thank you!
Re: Thread size on fuel tank taps
Posted: Sun Apr 16, 2023 10:35 am
by g80csp11
Brian , if its a later tank then it will be a 1/4 BSP
Re: Thread size on fuel tank taps
Posted: Sun Apr 16, 2023 12:28 pm
by BrianDowning
It's a 1961 model 8
Re: Thread size on fuel tank taps
Posted: Sun Apr 16, 2023 5:56 pm
by bitza
You can buy b s p blanking plugs at most plumbing outlets.
Re: Thread size on fuel tank taps
Posted: Mon Apr 17, 2023 7:44 am
by BrianDowning
Cheers all! Brian
Re: Thread size on fuel tank taps
Posted: Tue Apr 18, 2023 5:27 am
by Red Gauntlet
From my experience, POR15 and similar tank coating preps carry on rusting underneath the coating, in a few years you will want rid of it. Best leave the tank bare metal inside and keep fuel in it. Clean the tank first with white vinegar if it is rusty / dirty and wash out with distilled water.
Re: Thread size on fuel tank taps
Posted: Thu Apr 20, 2023 1:25 pm
by BrianDowning
Thanks for the warning!
Re: Thread size on fuel tank taps
Posted: Thu Apr 20, 2023 3:40 pm
by spookefoote1956
I use grey Slosh
