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Fuel Line Dim

Posted by alanrw 
March 11, 2012 08:54PM
Hey, does anyone know what the diameter spec is for rubber fuel line for an E 30? It's metric isn't it? Or is it 5/16"?

alan
March 11, 2012 09:04PM
I think I bought some 5/16 that worked. It would translate to about 8mm.

Bob in Everett
rkj
March 12, 2012 12:09AM
Quote
Bob in Everett
I think I bought some 5/16 that worked. It would translate to about 8mm.

That's what I use, just make sure it's fuel injection hose, it's a little stiffer. I have a spray bottle with soap and water to help ease it on.
March 12, 2012 05:33AM
The flexibility of the hose will make no difference if it's metric or not, just make sure you use proper clamps.
An e30 should be now going through the 3rd or 4th set of rubber tubes and o-rings.
While in there, you may want to check. There are some rubber o-rings at the fuel pressure regulator and injectors, make sure there are no traces of gas coming from there.
It's an expensive and dangerous fault to have, and very cheap to fix correctly.
smileys with beer
March 12, 2012 01:10PM
OK, 8mm = .314"

5/16"= .310"

close enough!!!!!


alan
March 12, 2012 01:37PM
Quote
alanrw
OK, 8mm = .314"

5/16"= .310"

close enough!!!!!


alan
Those fractions make my head hurt...
The 8mm hose, considering the tolerance, should be good from 7.6mm up to 8.4mm, or more considering it stretches a bit.
On a rubber hose, the third decimal place means nothing in reality.



Edited 1 time(s). Last edit at 03/12/2012 01:38PM by Jose Pinto.
March 12, 2012 08:32PM
0.3125 to be exact

Bob in Everett
sdp
March 13, 2012 10:33PM
254mm in an inch.. not 256.

8 / 254 = 0.31495
March 13, 2012 11:51PM
you were probably thinking Pi = 3.1.4159

Bob in Everett
sdp
March 14, 2012 01:36AM
Oops 25.4mm not 254.

Maybe apple pi(e).
March 14, 2012 10:13AM
Quote
sdp
Oops 25.4mm not 254.

Maybe apple pi(e).
Today is 3.14, the Pi day!
rkj
March 14, 2012 10:40PM
Quote
Jose Pinto
The flexibility of the hose will make no difference if it's metric or not, just make sure you use proper clamps.
An e30 should be now going through the 3rd or 4th set of rubber tubes and o-rings.
While in there, you may want to check. There are some rubber o-rings at the fuel pressure regulator and injectors, make sure there are no traces of gas coming from there.
It's an expensive and dangerous fault to have, and very cheap to fix correctly.
smileys with beer

What I meant was fuel injection hose is built to withstand the line pressures of the fuel injection, where as regular fuel hose is for lower pressure systems like carburetor or lawn mowers...
March 15, 2012 06:27AM
Quote
rkj

What I meant was fuel injection hose is built to withstand the line pressures of the fuel injection, where as regular fuel hose is for lower pressure systems like carburetor or lawn mowers...

Fuel pressure is no big deal, 35psi or 2.4 bar, about the same you put in your tires for the highway.
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