Help: My Fuel Return Line LEAKS...

HMBJack

Member
Joined
Feb 23, 2017
Location
Half Moon Bay California
TDI
Audi Q5
This little canister shaped thing from my fuel pump (2014 Audi Q5 with 3.0L TDI) leaked at 52K miles.

Specifically, it leaks in the single fuel line coming from the fuel pump. The two lines on the other side of the canister remain dry.



I ordered a new one of these with attached fuel line from ECS Tuning.
Installed it and it too leaks! I think the cheap plastic somehow cracks when they assemble it? Not sure. All I know is the thing leaks fuel.
Very disappointed that the factory original cracked or leaks at 52K miles.

I'm not sure why a simple Tee here won't work.
Does this canister shaped thing adjust fuel pressure somehow?
Anyone have a solution?
 
Last edited:

HMBJack

Member
Joined
Feb 23, 2017
Location
Half Moon Bay California
TDI
Audi Q5
Well, having received no inputs on my question, I have this update:

1. Like all cars today, our TDI's are made of metal, rubber and plastic. And this particular plastic fuel restricting "canister" is weak and prone to failure. My factory original leaked fuel after just 52K miles and the Bosch exact replacement leaks immediately after install. I promise you, I didn't break it during the install.

2. So, I took it upon myself to make a better fitting. Built one out of a Brass Tee with a restricting fitting coming from the fuel pump. Clamped all 3 ends of the fuel lines. Car is again running great. Seeing no performance issues and no Check Engine light.

A simple "tee" doesn't work because the fuel flow must be restricted.
In the end, in the battle of Metal Vs. Plastic, Metal Wins everytime...
 
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