7 replies to this topic

[Gladyscooper]

I have recently taken the fuel trap out along with the the EMU vacuum pipes, when it was removed the  short green pipe on the fuel trap was connected to the short pipe to the manifold.  But I noticed that the long pipe to the EMU has green tags on it.

 

does it matter which way around the pipes are connected to the fuel trap?

[madazv8]

Green pipe on the fuel trap is on the ECU side on mine,  but I very much doubt it matters - having cut one open,  there is literally nothing inside,  it's just a box.  Seems to be completely pointless,  but that's another discussion.

[sonscar]

It helps prevent the MAP sensor being contaminated.Try a generic plastic fuel filter.Steve..

[Pops_Guild]

The fuel trap is important it stops fuel getting to the MAP sensor on the ECU and breaking that. Green side needs to be on the ECU side (“green is clean”).

Having it the right way round matters, you’ll get idling issues if it’s the wrong way round plus emissions if it’s wrong at MOT time.

[madazv8]

I get the idea.  I really do, and I am NOT advocating for one second that we should remove it.

 

However... I cut one open,  it is literally an empty box with 2 nipples.  Can't see any cleverness to it.  If it is simply to condense fuel vapors when the engine is off,  then why on earth would it have the nipples on the bottom where the condensed fuel will actually run into the pipe. And the location,  in a nice hot part of the engine bay,  seems odd if that is how it is meant to work. I just replaced my MAP sensor,  and it was caked in brown condensed fuel inside when I cut that open - in fairness I can't guarantee that the car has always had the trap,  but I know it has in recent years.

 

I am sure the Rover engineers are far smarter than me and they did the right thing,  just thinking out loud.

[Pops_Guild]

From what you describe it sounds like whoever is making fuel traps now, might not be making them properly...

 

If you're on FB then Sprocket is still from time to time active there on the Classic Mini SPi group, he did a post on this very topic, there should be something different per nipple inside and that is why it works.

 

Classic Mini SPi | This is what is (or isn’t ) inside the fuel trap.... | Facebook

[madazv8]

Interesting,  I'll check that out.  Cheers.

[madazv8]

That was an interesting read.  So I recant my previous statement that it seems pointless.  The unit I opened up must have been some "fake" rubbish.  The correct internals with the green stub being longer on the inside makes perfect sense in how it deals with evaporates. So yes,  green to the ECU matters.   Thanks for the education.