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Fulmar 88 - thread for fuel tap

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Fulmar 88 - thread for fuel tap

Post  Brentis1 on Sun Jul 24, 2016 9:01 am

Hi guys,
I have a Fulmar 88 which has a "pain in the butt" leak from the fuel tap socket in the fuel tank. It looks like the thread is 1/4" BSP but wanted to check before I run a plug tap in it. I have tried a couple of new fuel taps which were very tight to wind in and only went in a couple of turns so I suspect the thread in the tank has been damaged.
Thanks in advance!
Brent

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Thread in tank..

Post  john87 on Sun Jul 24, 2016 10:19 am

I have no idea what thread is in the tank, BUT, where did you get the new petrol tap from?? Is it a new one??

If it is, i suppose there is a fair chance it is made in china shit...

If it is, it is most likely 1/4 NPT [as the chinese usually use NPT/UNC/UNF as they think all their stuff is going to the USA] Anyway, the 1/4 NPT and the 1/4 BSP are NOT the same, the pitch is different..

Later on when i got 2 mins, i will measure the thread in a tank i have here and tell you what i discover..

john..

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fuel tap thread

Post  piston 197 on Sun Jul 24, 2016 4:16 pm

FB used BSP threaded petrol taps in common with the rest of the British m/cycle industry, you may either have a damaged thread in the tank boss, or as said above a wrongly threaded petrol tap ? Japanese and Italian machines use a Metric-fine threaded petrol tap, similar in TPI but different pitch, there may have been one of these forced in at some time.
JH
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Fuel taps

Post  kerabo on Sun Jul 24, 2016 6:02 pm

I just wanted to add that there are some very high quality taps for sale. If you search ebay you can pay up to 30.00 for a beautiful tap although not the original type. There are some cheap ones and the one I had parted on the thread with just gently nipping up.

Ken
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Fuel taps

Post  john87 on Sun Jul 24, 2016 7:17 pm

Yes, you only ever get what you pay for.. Cheap, generally equates with nasty..

john..

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Re: Fulmar 88 - thread for fuel tap

Post  Brentis1 on Sun Jul 24, 2016 9:33 pm

Thanks for that guys!

I have several British bikes in the shed all of which use 1/4 BSP fuel taps so it was a couple of these I tried to fit.

Must be a damaged thread in the boss.

Cheers

Brent

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Re: Fulmar 88 - thread for fuel tap

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