need hlp w/fuel line 2 fuel pressure reg and fuel rail

[nickelndime]

can this line be made from standard size lines with a reducer or does it have to be the pre-made line from pelican parts or bav-auto?it comes from the bottom of the car with another fuel line.one goes into fuel rail and one into fuel pressure regulator. they are both next to each other.not sure of the size of these two lines and if i have to get an actual bmw premade fuel lines or can i duplicate them with standard size line from local parts store.i looked on realoem.com amd this link to the fuel injection diagram page does not have the size of these hoses.the numbers are on the diagram but not on the part number list so I cant get a size either.

http://www.realoem.com/bmw/showparts.do?model=1123&mospid=47309&btnr=13_0267&hg=13&fg=15

please help as I am trying to replace a bunch of suspected culprits for a bad idle and noticed the lines were dry and cracked.

[jlevie]

5/16" injection rated hose is what you need for the high pressure side. You can use ordinary 5/16" fuel hose for the return.