Mercedes diesel fuel system questions

On Mercedes diesels:
Does anybody know if the return line is submerged in the fuel tank?
In other words, can I draw fuel from the tank's return line or will I
just end up drawing air?

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.