Hi guys, I put a 3.9 mag in my 94 Jeep YJ.
I need to know which line is pressure and which is return at the fuel rail, #7 & #8 in picture. thanks

 

Is anyone able to slide under their truck and follow the fuel filter line up to the fuel rail and tell me if its #7 or #8 . I have looked all over the web and in my books,and cant find anything. thanks

 

if one is low pressure hose it might be the return. if it has a SAE number or a hose mfg number that might tell you.

 

there is a low pressure hose, and a stainless braided line. since its in a jeep the main lines are different. I pulled my transmission and transfer case and built them but I had a buddy helping on the top side and he pulled both lines off at the fuel rail. so i need to know which line in the picture is the feed.

 

I tried looking it up but couldn't find anything. Put it all together except the fuel lines and turn the key on. The line spitting fuel out is the pressure and the other is the return.

 

I can follow the line from the fuel filter- so I know which line is pressure, what I dont know is where to hook it up. hence the reason I asked which line in the photo #7 or #8 is the pressure.

I guess i will hook it up and if it doesnt run then I will switch them...

 

Just in case anyone was wondering. the 2 lines on the fuel rail are different sizes and the larger of the 2 is the feed, which would #8