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Fuel tank problem

Submitted by christopher_fe… on Wed, 07/09/2022
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Commando

Hi again everyone I have a problem with  my tank leaking fuel from the tank to tap fitting, I have fitted dowty washers 3 times and they can't all be faulty, I have tried a flat washer under the dowty to pull it up evenly and have just ordered some 1/4 BSP fibre washers to give the old fashioned way a try but up to now I cannot stop it dripping and the garage is full of fumes every time I open the door I have tried holding the tap while I tighten the lock nut and have now stripped the thread on the tap, so have also ordered a new tap so can anyone give me a suggestion for some kind of petrol proof lagging such as the sort of stuff gas fitters used to use around gas pipe threads to seal the joints or any other suggestions I could try, many thanks Chris

Submitted by mikael_ridderstad on Thu, 08/09/2022

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A Loctite thread sealant on a petrol tap has worked for me.. Sorry, don't remember if it was 545 or 577.

Submitted by steve_constable on Thu, 08/09/2022

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Are you using actual dowty washers or the proper fuel seals?  The correct seals should push the rubber into the thread grooves when tightened. Agreed, they don’t always work as well as they should!

https://www.classicbikeshop.co.uk/fuel-petrol-tap-washer.html

Submitted by richard_mills on Thu, 08/09/2022

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I use PTFE tape on the thread, and fibre washers between the tap and tank. The tape goes from white to clear when it contacts petrol but does not degrade over time. I smear a small amount of Blue Hylomar sealant over both faces of the fibre washers before fitting. Do not experience any leaks, or problems dismantling if required later.

Submitted by john_holmes on Thu, 08/09/2022

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There is yellow PTFE tape for fuel, its double the thickness so more chance of sealing. I use copper sleeved rubber rings plus a 1/2 thickness BSP nut.

 


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