Fuel hose thread size - anyone able to confirm?

[TandC]

 

Hello all,

 

 

I'm trying to identify the thread size of this fitting which is the diesel return from the engine, this fitting screws into a fitting brazed onto my diesel tank to return unused fuel.

 

Is that a 1/2" BSP?   I am ordering a replacement diesel tank to be constructed and need the corresponding fitting built in.

 

Any wisdom?  It's a Vetus fuel line, fitted on a Lister SR2

 

Thanks 

 

 

 

 

 

[BEngo]

No pic for me.

 

What is the outside diameter of the thread?

 

3/8 BSP  is  OD 0.656 in ( a bit bigger than 5/8 in) or  16.62 mm and is 19 tpi

 

1/2 BSP is 0.825 in ( 7/8 in)  20.995 mm and is 14 tpi.

 

If you don't have a caliper, a decent adjustable spanner and a tape measure can be used as a substitute.

 

If in doubt, order a 3/4 BSP socket in the new tank and buy brass  threaded bushes 3/4 outside by 1/2 inside and 3/4 outside by 3/8 inside.  One will fit.

 

Your local plumbers merchant or Plumbase should have these.

 

N

 

 

[David Mack]

1/2 bsp sounds big to me for a fuel return line. It might be, but I would have thought 1/4 or 3/8 bsp more likely. You will need to measure the thread or try it in fitting(s) of known size to be sure.

[robtheplod]

12 hours ago, TandC said:

 

Hello all,

 

 

I'm trying to identify the thread size of this fitting which is the diesel return from the engine, this fitting screws into a fitting brazed onto my diesel tank to return unused fuel.

 

Is that a 1/2" BSP?   I am ordering a replacement diesel tank to be constructed and need the corresponding fitting built in.

 

Any wisdom?  It's a Vetus fuel line, fitted on a Lister SR2

 

Thanks 

 

 

 

 

 

I did this very recently on ours. The screw thread on our tank is 1/4" BSP, but not sure if there is a 'standard' ? 

[ditchcrawler]

2 hours ago, robtheplod said:

I did this very recently on ours. The screw thread on our tank is 1/4" BSP, but not sure if there is a 'standard' ? 

Same as mine

 

[TandC]

Ah sorry - not sure why the pic isn't showing.  I shall get back out there with the vernier gauge

[BEngo]

To add to  the possibilities 1/4 BSP is 0.518 in ( just over 1/2 in) or 13.16 mm  OD.

 

N