Which fuel lines are which? E30

[Enriquez2000]

Getting ready to test fire this car but want to be sure where engine bay fuel lines go.

at the bottom of drivers fire wall there are 3 stacked in a row. Just need to know which is feed and which is return if you have that info.

no lift so trying to save myself a crawl under the car to trace out

[MrBurgundy]

crank the car and you'll find out

[Enriquez2000]

crank the car and you'll find out

I know i can find feed lol... but probably dont want to mix up return and vent

[reelizmpro]

Replace one at a time and you won't mix them up.

[Enriquez2000]

Replace one at a time and you won't mix them up.

I got the car with no hoses just hard lines. I would have marked the hardlines if I did it

[MrBurgundy]

I might be wrong but I remember the fuel feed and return share a plastic clip underneath and the vapor line is clipped alone closest to the edge of the car.

[Enriquez2000]

I might be wrong but I remember the fuel feed and return share a plastic clip underneath and the vapor line is clipped alone closest to the edge of the car.

This is what im working with... so the 2 clipped together are feed and return? Where does the vapor line normally go? Evap?

[808ETA]

I had the same issue and found conflicting information online. I just went under and traced them back, it's also possible that in the past 30-40 years they were switched at some point.

[reelizmpro]

https://classicbimmerbits.com/e30-how-to/e30-fuel-hose-replacement/

[Enriquez2000]

https://classicbimmerbits.com/e30-ho...e-replacement/

This is GOLD!

[reelizmpro]

It's a decent write up but I don't know how accurate the diagram is. He marks the lower separate hose as the return but I believe it's the vent line to the charcoal canister as I remember changing out the top 2 lines only. I'd have to pop my hood to verify what's what.

Edit: just popped my hood to check and can confirm the bottom separate line is connected to the charcoal canister. The top 2 lines which are in the same bracket are the supply and return lines.



Top is return.

Middle feed.

Bottom is the separate vent line to the charcoal canister.

[Enriquez2000]

It's a decent write up but I don't know how accurate the diagram is. He marks the lower separate hose as the return but I believe it's the canister vent return line as I remember changing out the top 2 lines only. I'd have to pop my hood to verify what's what.

Well if you dont mind... its easier than tracing on my back under the car.

[reelizmpro]

I updated my previous post with my results.