Fuel tank tap thread

[pierodn]

Hi All.
I need to rethread the internal fuel tank tap adaptor .
I need to buy the tap but not sure if it is an 1/8 and how many tips.
Thank you .
Piero

 

[L.A.B.]

I need to rethread the internal fuel tank tap adaptor.
I need to buy the tap but not sure if it is an 1/8 and how many tips.

Do you mean an adaptor from 1/4" BSP (the tank thread size) to 1/8" (BSP)?

The fuel tank thread is 1/4" BSP (0.5180" x 19 TPI)

British Standard Pipe - Wikipedia

en.wikipedia.org

1/4" X 19 TPI BSP - Taps & Dies, Reamers, Milling Cutters, Tracy Tools

www.tracytools.com

1/8" BSP is 0.383" x 28 TPI although the internal thread of an "adaptor" might not be BSP.

1/8" X 28 TPI BSP - Taps & Dies, Reamers, Milling Cutters, Tracy Tools

www.tracytools.com

 

[dynodave]

Hi All.
I need to rethread the internal fuel tank tap adaptor .
I need to buy the tap but not sure if it is an 1/8 and how many tips.
Thank you .
Piero

All about language: American terminology no idea what the brits use
Only fastback tanks are 3/8BSPP but ALL fastback have 3/8 to 1/4 glued in adaptors.
therefore ALL late norton tanks, including fastback, use 1/4 BSPP petcocks.
Rethread means to "CHANGE" the thread
Chase means to clean up remove dirt or rust or old glue or sealer make like new
Like chaseing a person in the woods, you follow the SAME path (same thread pitch)
There is NO original 1/8 tank threads in norton
I chase all my british hardware to clean them up before I assemble parts

 

[kommando]

Only fastback tanks are 3/8BSPP

In UK we assume BSP is always parallel so do not add the second P and so just use BSP, for a tapered thread we add T to give BSPT.

Hence this help page in UK

https://www.ondemandsupplies.co.uk/...s-the-difference-between-bsp-and-bspt-thread/

But outside UK you instead see

BSPP vs BSP vs G vs PF thread difference - Knowledge - Yuyao Jiayuan Hydraulic Fitting Factory

BSPP vs BSP vs G vs PF thread difference

www.jiayuanfitting.com

 

[dynodave]

In UK we assume BSP is always parallel so do not add the second P

Yes sir!
Becoming obvious to me, my fate on this forum is death of a thousand cuts.

 

[pierodn]

Sorry, i would know the threadh of the fuel tap, the side that you screw into the tank.
Thank you.
Piero

 

[Triton Thrasher]

Yes sir!
Becoming obvious to me, my fate on this forum is death of a thousand cuts.

In consideration of mitigating circumstances, we can commute your sentence to death of 500 cuts.

 

[L.A.B.]

Sorry, i would know the threadh of the fuel tap, the side that you screw into the tank.
Thank you.
Piero

= 1/4" BSP (both ends of the fuel tap, normally).

Chrome flat lever on/off 1/4 - 1/4 bsp with filter

surreycycles.com

 

[pierodn]

= 1/4" BSP (both ends of the fuel tap, normally).

Chrome flat lever on/off 1/4 - 1/4 bsp with filter

surreycycles.com

Thank you