Plantoil/diesel conversion basics
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danalinscott

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Posted 06 May 2005 07:23 PM
This is what I have found works quite well on the MB rigid lines...

Simply cut them, with about 3/4" of the line still remaining on the fitting. You can then slide 5/16" ID rubber fuel line hose over the fitting and stub of rigid line, and then hose clamp.

I have been using this method for over 2 years and have not had any issues with leakage.



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danalinscott

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According to the Factory service Manual, the Mercedes Benz OM617 Fuel lift pump delivers fuel to the Main filter at a pressure of > 0.8Bar.
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LarsNelson

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5/16= .312"
Rigid hose on a banjo connection measures .357"
3/8= .375"

Woudn't 3/8" id hose work about as well if gripped with a good quality clamping style clamp?

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1980 300SD 25k miles on80/20 WVO/Jet A blend, Fatty injection line heaters
25k more with a DIY two tank system.
danalinscott

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Quote:
Originally Posted by LarsNelson
5/16= .312"
Rigid hose on a banjo connection measures .357"
3/8= .375"

Woudn't 3/8" id hose work about as well if gripped with a good quality clamping style clamp?

Possibly...but in my experience using a smaller diameter hose will provide a better seal. This is especially true if the hose is to be under any vacuum ever. A hose under pressure is surely sealed once clamped tight enough to not allow fuel to leak out of the connection. But vacuum leaks seem to abound in hose connections where the hose is not stretched over the barb no matter how tight you clamp it.

 

Of course using high quality hose clamps in place of the standard variety is a good choice as well.  Regular hose clamps tend to twist the hose as they tighten it. This causes a "seam" to form on hoses larger than the hose barb they are fitted to. This seam is where leaks tend to occur...especially under vacuum.  Higher quality fuel line clamps tend to evenly tightened and so form no such "seam".  I will see if I can find some images to compare the two and stick them in a hose clamp discussion under components.

 

If anyone else can find these it would be very helpful.

 


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