7A fuel return union size

PoloGaz · 24-02-15, 08:59 PM

On the braided fuel lines supplying the rail, does anyone know what the thread size is for the union on the return line? The supply is M14x1.5 but the Return is larger, M16x1.5 perhaps?

Thanks

mikes2 · 25-02-15, 11:25 AM

You sure ?

I used new fittings on the lines when I replaced them and they were both the same.

One of them is larger - you need a 19mm spanner instead of the 17mm on the other but the internal threads are the same

PoloGaz · 25-02-15, 07:39 PM

Yep

PoloGaz · 25-02-15, 08:03 PM

I bought m14x1.5 fittings and they fit the smaller one!

M16x1.5 seems to be an odd size for 5/16 line. 3/8 perhaps...might be easier to get a different braided fuel line!

Error404 · 25-02-15, 09:59 PM

I think it is M16 mate, they are different sizes so you don't mix them up

Don't think they are commercially available for 8mm tube. See if someone breaking a B3 or B4 car can chop them off for you

PoloGaz · 25-02-15, 10:14 PM

Thanks. was hoping you might have a spare.

mikes2 · 26-02-15, 08:50 AM

I guess I must have re-used the original - apologies.

You can get M16 x 1.5mm for 10mm pipe from Clarik Engineering supplies - not seen them for 8mm pipe

Error404 · 26-02-15, 08:52 AM

Gaz I know a man who has a cq in for breaking, I am sure he would chop them off for you

Are you on S2forum? If so send a PM to Dave aka bluequattro I'm sure he can help

PoloGaz · 26-02-15, 09:03 AM

Yeah I'm on there ok thanks!

PoloGaz · 26-02-15, 03:35 PM

Messaged him and he got back to me really quick - not got anything in at the moment.

I did find a reducer bush that would make the thread M12x1.5 and I *think* that's the size of one of the fittings, though it might only be the thread on the banjo, in which case I think I can use that. I figured it'd work because the seal is with the pipe flare end and not the thread so I've ordered one to try.

25-02-15, 11:25 AM	#2
mikes2 4 ring whore! Classic Audi Club Member Join Date: Nov 2007 Location: Polmont Posts: 2,617	You sure ? I used new fittings on the lines when I replaced them and they were both the same. One of them is larger - you need a 19mm spanner instead of the 17mm on the other but the internal threads are the same __________________ 1991 90 quattro 20v sport 1991 90 quattro

26-02-15, 08:50 AM	#7
mikes2 4 ring whore! Classic Audi Club Member Join Date: Nov 2007 Location: Polmont Posts: 2,617	I guess I must have re-used the original - apologies. You can get M16 x 1.5mm for 10mm pipe from Clarik Engineering supplies - not seen them for 8mm pipe __________________ 1991 90 quattro 20v sport 1991 90 quattro

25-02-15, 07:39 PM	#3
PoloGaz Grown up member Classic Audi Club Member Join Date: Aug 2012 Location: Manchester Posts: 362	Yep

25-02-15, 08:03 PM	#4
PoloGaz Grown up member Classic Audi Club Member Join Date: Aug 2012 Location: Manchester Posts: 362	I bought m14x1.5 fittings and they fit the smaller one! M16x1.5 seems to be an odd size for 5/16 line. 3/8 perhaps...might be easier to get a different braided fuel line!

25-02-15, 09:59 PM	#5
Error404 Thobbing Member Classic Audi Club Member Join Date: Sep 2008 Location: Staffs Posts: 490	I think it is M16 mate, they are different sizes so you don't mix them up Don't think they are commercially available for 8mm tube. See if someone breaking a B3 or B4 car can chop them off for you

25-02-15, 10:14 PM	#6
PoloGaz Grown up member Classic Audi Club Member Join Date: Aug 2012 Location: Manchester Posts: 362	Thanks. was hoping you might have a spare.

26-02-15, 08:52 AM	#8
Error404 Thobbing Member Classic Audi Club Member Join Date: Sep 2008 Location: Staffs Posts: 490	Gaz I know a man who has a cq in for breaking, I am sure he would chop them off for you Are you on S2forum? If so send a PM to Dave aka bluequattro I'm sure he can help

26-02-15, 09:03 AM	#9
PoloGaz Grown up member Classic Audi Club Member Join Date: Aug 2012 Location: Manchester Posts: 362	Yeah I'm on there ok thanks!

26-02-15, 03:35 PM	#10
PoloGaz Grown up member Classic Audi Club Member Join Date: Aug 2012 Location: Manchester Posts: 362	Messaged him and he got back to me really quick - not got anything in at the moment. I did find a reducer bush that would make the thread M12x1.5 and I think that's the size of one of the fittings, though it might only be the thread on the banjo, in which case I think I can use that. I figured it'd work because the seal is with the pipe flare end and not the thread so I've ordered one to try.