W123 fuel lines setup past switchover valve - help

For discussing the modifications needed for diesel vehicles to run with 2 tank veggie oil conversions.

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W123 fuel lines setup past switchover valve - help

Postby kabonzi » Wed May 19, 2010 9:16 am

Just got a W123 with kit already in car. Was told by the previous owner that the WVO system was purchased through Greasel.com but could not find my particular setup on their website. Foolish on my part I took the conversion kit apart before taking any pictures. Could anyone help me with a basic diagram or explanation - the thing that puzzles me - there is no return line for the WVO to go back to the tank, but rather some type of a loop with a quarter turn valve... The two lines come from both filters (regular diesel fuel and WVO) they merge at the switchover valve and then...? Where does the unburn portion of WVO go with no return fuel line?
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Re: W123 fuel lines setup past switchover valve - help

Postby SunWizard » Wed May 19, 2010 10:04 am

kabonzi wrote:Where does the unburn portion of WVO go with no return fuel line?

Thats called a looped return and is the best way to go. See my diagram here for the best system:
http://www.burnveg.com/forum/viewtopic.php?t=28
One thing they do different from me is put the filters before the switching valve, which eliminates 1 valve, but puts them under vacuum which makes much more problems with air leaks.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
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thanks - this is the info I needed

Postby kabonzi » Wed May 19, 2010 5:36 pm

this sound like a winner... I will reroute the lines and give it a try.
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Postby coachgeo » Wed May 19, 2010 7:47 pm

The reality of that MB car does not quit fit that diagram of the dodge.

Is that at 300D OM617 5cyl engine orrr a 240D with an OM616 4cyl engine orr??

Was their a manual return valve installed under the hood in that loop or was it 12v valve with a switch in the cab? This is an important clue we need to know to help you.

Greasel is now Golden Fuel. You can message them and get a diagram. Many folk have gone a step beyond the Greasel setup on MB's. Having the diagram will tell you if the previous user did it as Greasel prescribes or if they upgraded it any.

http://www.goldenfuelsystems.com

Let us know what W123 you have so we can help you. This is important.
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Postby SunWizard » Thu May 20, 2010 8:32 am

coachgeo wrote:The reality of that MB car does not quit fit that diagram of the dodge.

Both my Mercedes (81 and 87) do, where do you think it differs?
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
Low fossil net zero house- 100% solar power and heat.
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Postby coachgeo » Thu May 20, 2010 12:05 pm

Point is I think he is saying there is a manual valve under the hood. this set up if I recall right only gets its valve moved occasionally to bleed air. Majority of the time it is full time loop diesel and veg.

Nothing in your Dodge diagram would tell an MB kit fitter about the fuel/air return banjo bolt built into the head of the OEM fuel filter arrangement. Also does not one method of plumbing require the banjo bolt to be blocked and another one does not? What has been done with his banjo bolt by PO?
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Postby SunWizard » Fri May 21, 2010 9:00 am

coachgeo wrote:Nothing in your Dodge diagram would tell an MB kit fitter about the fuel/air return banjo bolt built into the head of the OEM fuel filter arrangement.

That is covered in the text since I can't explain that in the diagram, but it is shown as a short line on top of the filter that is blocked. The dodge has a return banjo bolt that must be blocked on the top of the filter just like the mercedes.
Also does not one method of plumbing require the banjo bolt to be blocked and another one does not?

No they are the same, block on both.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
Low fossil net zero house- 100% solar power and heat.
SunWizard
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Postby coachgeo » Fri May 21, 2010 11:08 am

good info, thanks
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