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Return on fuel filter - do you really need it?

Printed From: The Brick-yard
Category: LT, Crafter & Sprinter Section
Forum Name: LT, Crafter & Sprinter Tech
Forum Description: All LT, Crafter & Sprinter tech related stuff in here
Printed Date: 19 Jan 21 at 03:05
Software Version: Web Wiz Forums 12.01 -

Topic: Return on fuel filter - do you really need it?
Posted By: Junk
Subject: Return on fuel filter - do you really need it?
Date Posted: 06 Jul 20 at 10:43
Theres loads of posts on here about the return thingy on the fuel filter next to the engine.

I mean the little plastic t-shaped thing which passes the return fuel line through the filter, its held in place with an R clip.

Most people who've posted suspect its flimsyness as a source of an air leak - actually I think mine is leaking fuel because there's always a little puddle on top of the filter.

Most people on the forum have been advising to change the filter for the same one as under the wheel arch - i.e. just in-out, no return.

I read that the reason the return line goes back into the filter is to keep supplying warm diesel from the return for starting on cold days. I wonder how much difference that makes.

Has anyone on here swapped the filter for an in-out'er? How did it go starting in winter?

Any alternative suggestions?


LT 35 TD from 1995 (ACL engine) with a box truck body

Posted By: Monster LT
Date Posted: 06 Jul 20 at 13:34
Find the leak and fix it. If fuel is leaking out air is likely to be leaking in. The fuel needs to return somewhere.


Posted By: Junk
Date Posted: 06 Jul 20 at 15:40
Think you didnt understand me, maybe i didnt explain my question very well.

-I am very sure that the leak is from the plastic t joint thingy which passes the return fuel line thru the filter.

-I already replaced the filter and the plastic thingy but it's still leaking.

-Others on this forum with the same problem have replaced the filter with another one, the same as the one under the wheel arch (only in-out, no return); and bridged the gap in the return fuel line with one of those plastic connectors.

My questions are:

-Has anyone reading done that? How did it affect your cold starting in winter?
-Has anyone solved the same problem in a different way?

I guess you could use a different, aftermarket filter which has a different (less flimsy) in-out for the return line, but i wouldnt know where to start in looking for one.

LT 35 TD from 1995 (ACL engine) with a box truck body

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