Very stiff 1 1/4 BSP fitting

[rogerthebodger]

The better and easer way would be to run a tap down the tank fitting as a suggested.

To try to run a die on the mail fitting will not do much as the is not enough there before the flange when the fuel sender.

I built my steel fuel tanks with welded in sockets and all the sockets I have come cross are parallel threads Its the mail that is normally either parallel of tapered thread.

Make sure that the tank connection if tapered before you go down the road of modifying the sender thread.

This is the normal BSP socket

316 STAINLESS STEEL BSPP FEMALE FULL SOCKET

The only BSPT sockets I have seen are for very high pressure hydraulics 3000 psi 0r more.

 

[philwebb]

This would work, but the swarf would go in the tank, and thats the last thing I want as very hard to clean.
[
The grease should hold the swarf. If you are unlucky and get some in the tank it should sit at the bottom. Plus you have two filters between the tank and the engine.

 

[penfold]

Do you mean run it over the thread to make it tapered? I have got a big steel fabricator/engineer down at the end of my road. They should have a tapered die... hopefully.

We are at cross-purposes; I didn't read and comprehend #37. I would be inclined to just fit the sensor and use a thread sealing compound such as loctite 577, especially as you do not like the idea of tapping out the tank boss.

 

[penberth3]

First I'd try to see if there were plumbers(proper plumbers, not a bloke in a van who'll fit a bath for you), hydraulic engineers, agricultural engineers, mobile pipe/hose fitters(Pirtek or similar) local to you who will most likely have a 1-1/4" BSP die and ask them to run it over your sensor to make it into a parallel thread. If that's not possible buy a die-nut and do it yourself; a die is also an option, but then you need to buy a die-holder too and it all ends up costing a lot more.

You can't make a tapered thread into a parallel thread.

 

[Caraway]

BSP is the Devil's Spawn.

 

[Caraway]

We are at cross-purposes; I didn't read and comprehend #37. I would be inclined to just fit the sensor and use a thread sealing compound such as loctite 577, especially as you do not like the idea of tapping out the tank boss.

If it doesn't seat will the sender give the correct reading? Or is it cloe enough?

 

[noahdipaola03]

If it doesn't seat will the sender give the correct reading? Or is it cloe enough?

It will be close enough give or take 10mm. It will
just mean I have slightly more fuel then the gauge reads... always good!

 

[RichardS]

You can't make a tapered thread into a parallel thread.

Not a parallel thread of the same nominal diameter but you can cut an entirely new thread although it might be end up too loose.

Richard

 

[penberth3]

Not a parallel thread of the same nominal diameter but you can cut an entirely new thread although it might be end up too loose.

Richard

What on earth are you on about? This is 1 1/4" BSP on a pipe fitting. If you re-cut that to the next smaller size you'd be down to fresh air, with no metal left.

 

[RichardS]

What on earth are you on about? This is 1 1/4" BSP on a pipe fitting. If you re-cut that to the next smaller size you'd be down to fresh air, with no metal left.

What I'm on about is 55 years engineering experience.

You said "You can't make a tapered thread into a parallel thread" but I suspect that you now wish to quality that statement? Isn't experience a marvellous thing?

Richard

 

[rogerthebodger]

What I'm on about is 55 years engineering experience.

You said "You can't make a tapered thread into a parallel thread" but I suspect that you now wish to quality that statement? Isn't experience a marvellous thing?

Richard

I agree you cannot make a an external tapered into a parallel but you can make a internal taper thread into parallel simply by running a tap down the inside taper thread.

Same amount of practical and design Engineering experience.

With the external thread on the OP fuel sender you would have no chance of changing the parallel thread into a taper thread.

As I have aid before hire a 1 1/4 tap and run it down the tank fitting. Would take no more then 30 minutes if that

 

[RichardS]

I agree you cannot make a an external tapered into a parallel but you can make a internal taper thread into parallel simply by running a tap down the inside taper thread.

Same amount of practical and design Engineering experience.

With the external thread on the OP fuel sender you would have no chance of changing the parallel thread into a taper thread.

As I have aid before hire a 1 1/4 tap and run it down the tank fitting. Would take no more then 30 minutes if that

Indeed so. There are several exceptions. I've seen tapered male threads on thick wall fittings where it would be relatively simple to grind the taper to parallel and then cut a new thread.

"What on earth are you on about" is an aggressive exclamation and needs to be challenged, exactly as you have done. Experience rules.

Richard

 

[rogerthebodger]

"What on earth are you on about" is an aggressive exclamation and needs to be challenged, exactly as you have done. Experience rules.

Richard

Sorry Richard have I been done some thing wrong.

There are some who don't recognize or don't wish to recognize peoples experience which and be different to theirs but still as valid.

 

[RichardS]

Sorry Richard have I been done some thing wrong.

Definitely not. You were absolutely correct, Roger

Richard