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Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion > Alternative Fuels

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  #1  
Old 07-02-2015, 11:19 AM
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Join Date: Apr 2015
Posts: 19
wvo diagram, along with some questions

attached is my veggie oil system for my OM617 Toyota, i'm new to MB but have run one in a powerstroke for years. Here are my parts list:

35 gallon VO tank
20 gallon diesel tank
Facet 60302 12v electric fuel pumps
WIX 5 micron Spin on fuel filter w/ base
40 Plate FPHE (veggie side)
Ford Dual tank selector valve



So my questions are with supply/return. I have noticed a gap in fuel when i switch from diesel to veggie and have to wait for the pump to catch up or i have fuel starvation issues. Its why i've installed the helper pumps which i only engage for half a minute or so upon switching fuel sources. Also is there an "ideal return pressure" when burning veggie, i'm considering scrapping the stock FPR bolt and installing an adjustable FPR.
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Old 07-02-2015, 11:46 PM
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grzpdlr
 
Join Date: Feb 2011
Location: Los Angeles
Posts: 258
Couple of suggestions:
1. On the veggie side put the heat exchanger before the filter, hot oil filters better than cold.
2. Loop your veggie return back to the a tee in the fuel line out of the tank, don't waste all that heat going back into the tank.
3. Consider injector line heaters from fattywagon.com.
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Old 07-05-2015, 01:14 PM
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Join Date: Apr 2015
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also a note on this, i originally plumbed my injector return line into the return side of the system because i removed the stock filter setup, this works fine for diesel but will start blowing them off when VO is running. I plumbed it into the supply side and it works great.

Also i have encountered issues with blowing the return line off where it connects to my aluminum line, to fix this I will be adding an adjustable FPR to replace the FPR banjo bolt and I've gone and treated the whole fuel system as if its fuel injected by flaring all hard lines and upgrading to injection hose clamps. This is ideal if I ever decide to scrap the mechanical fuel pump and go with a bosch-style electric pump.

Lastly the "helper pump" i have installed on the VO side is pointless. Its a low pressure unit and isnt powerful enough to push the oil through the spin-on filters. Works great on the diesel side though. I've kept the clear plastic filter on the supply side right before the mechanical pump as a way to visually check for starvation.
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Old 07-05-2015, 02:21 PM
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love all animals
 
Join Date: Nov 2008
Location: bristol,tn
Posts: 5,444
the facet pumps may last 25 days.The airtex type solenoid pumps last longer,I bought my 12psi from NAPA made for diesel,they last a year.FASS used to make a veggie pump,and they sell rebuild kits,but they are over $500.I used larger fuel line coming from veggie tank to heat exchanger,I also bout injector fuel line heaters,and wired a thermo on it,so it would turn off when coolant was hot.
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Old 07-05-2015, 05:47 PM
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in my powerstroke i run the bosch style pump and they last about a year before needing replaced. I had seen some of the mercedes tuner guys are running them in their setups with a 30 psi regulated return. This is waayyy more fuel then it'll ever need but i believe that the theory is oversupply vs undersupply. For veggie this also means the fuel isnt sitting in your supply line all that long so not able to warm up as much as a low psi system. I believe the mechanical pump is more then enough for veggie oil, and i've heard they last quite a while.

I run a 40 plate Flat Plate heat exchanger, which is huuuge compared to most VO systems that run a 10 or 20 plate but only slightly more expensive. This is the only component that heats my Veggie and I see veggie temps of 170+ degrees with the stock return banjo, with an adjustable FPR i anticipate even higher temps. The return fuel line will heat the VO in my tank, but not substantially since I anticipate very little returning if any at WOT. The only reason i have a return is to remove air from the system when switching tanks. I run a 10% diesel mix most months as an anti-bacterial, then a 50/50 from november to march to control viscosity at lower temps.
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Old 07-06-2015, 07:58 AM
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love all animals
 
Join Date: Nov 2008
Location: bristol,tn
Posts: 5,444
Oh forgot to mention,I run my fuel in a loop,for veggie,I don't return it.It can cause moisture reheating the veggie.I have a NAPA 5 micron filter,it has two supply,and two return ports.I reroute return line into supply port,and block the other return port off.
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