transmission oil, rubber fuel lines

deerefan · Feb 9, 2006

I am working on a project and plan on mounting an external cooler for a gear box that uses transmission fluid for lubrication. I was going to use some left over 3/8 rubber fuel supply hose laying around to plumb the gear box to the cooler but was told not to b/c trans fluid will eat away at the fuel line hose, causing pieces of rubber to get into my gear box. Is this true? I've never heard of this before. The guy recommended hydraulic lines, but that stuff can get pricey.

jeffmazz · Feb 11, 2006

Deerefan,

You should use hose that is rated for oils. You can find it at any auto parts store...ask for trans/oil cooler hose. It isn't much more expensive than fuel line. The problem with fuel line is that it may not be rated to take the pressure you are going to push through it.

Jeff

markct · Feb 12, 2006

some of the newer fuel line is rated for gas, oil and diesel, i got some from napa a while back that was listed as such. regular gasoline line will get kinda puffy over time when used on oil or diesel fuel lines. now thats not to say that you shouldnt use tranny line for your application since it may be rated for a higher pressure. i usualy use gates weatherhead line for power steering and tranny lines, thats what we have at work for that use