Author Topic: Basic question... which barb is fuel supply vs. return? (Read 4141 times)

rob_e30 · « **on:** March 05, 2007, 06:02:05 PM »

I'm putting an M42 into my E30 and replacing an M20. I didn't take the M42 out so I need to know which barb on the fuel rail is supply and which is return? It's not in the Bentley's and I can't tell from Real OEM. There are two barbs one silver and one black that attach to a bracket on the intake manifold, one above the other.

I know which is the supply line from the pump/tank I just need to know where to connect which.

Thanks.

rob_e30 · « **Reply #1 on:** March 06, 2007, 05:01:36 PM »

Nobody here can answer this?

individualist · « **Reply #2 on:** March 06, 2007, 05:28:53 PM »

Standing on the driver's side looking at the motor. The return is the connection on the left side of the fuel rail.

individualist · « **Reply #3 on:** March 06, 2007, 05:34:42 PM »

Won't let me post a pic so here's the link.http://www.realoem.com/bmw/showparts.do?model=AF93&mospid=47305&btnr=13_0308&hg=13&fg=15

rob_e30 · « **Reply #4 on:** March 06, 2007, 05:43:40 PM »

Great. I see that they are labeled as inlet and return. I didn't notice that before, thanks!