Help Identify pipe on Westerbeke/Perkins 4107

[chaaaaaaaz]

Hello, all,
I was trying to remove the starter from my W 4107 as it was spinning up but not engaging the flywheel. I suspect a gummed pinion and wanted to try and clean it or get it serviced but I was unable to remove it as there is a hose that gets in the way of the mounting flange and won't allow the starter to slide off of its bolts. I found a video with the same tube/starter situation as I have. I am unable thus far to identify or get my hands/head in far enough to determine where the other end of the pipe goes.

Can anyone identify this pipe? I have looked at the Perkins 4107/4108 & Westerbeke 4107/W40 shop manuals and can't see it in any of the stock installations.

I've highlighted the mystery pipe blue.

Like where I found the pipe: http://www.youtube.com/watch?v=4fTd0lG1Wjc

Thanks in advance

[capttman]

Looks like it may be a fuel return line. Hard to see in this pic on my phone

[Cheechako]

is that the fuel filter there by the pipe? I assume it doesnt come out of that. It's wierd that it's on the opposite sidea s the injectors etc... does it come around the back of the engine from the injector rail or pump? if so, it's likely the fuel return line...

[SkiprJohn]

Is it the blue highlighted line coming from the back of the engine and going under the fuel filter?
Hard to see where it starts and ends but it isn't attached to the fuel filter, right? If it is attached to the top of the injectors and then runs to something that could return it to a tank then it would be a fuel return line. At least that's the way my Mercedes is set up.
kind regards,

[chaaaaaaaz]

The fuel injectors' return line returns directly to the fuel filter (top center banjo fitting).
Is it possible that the fuel injector pump's return line is the the blue highlighted tube and simply capped? I will try to follow the return line from the injector pump and see if it does in fact cross behind the block and end at that down turned pipe. If it really is capped off, is that an acceptable configuration?

Thanks!
Chaz