New Manual Valve Idea

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

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Postby SunWizard » Tue Mar 25, 2008 8:56 am

The ball valve is not needed. There is no pressure in the return line, its open to your tank. Then your diagram is exactly like the one I posted in other threads: Image

There would be no problem with a few cups a few times, but it starts to add up. I use so little diesel that VO would add up in there for about 4 months and end up being too much VO% in the D2 tank.
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 VegMeister » Tue Mar 25, 2008 9:42 am

Yes I can see it now! It seems so simple once you think about it.... and yes I've seen your diagram, but I never stopped to think that the veg return is T'd into the supply line there. Thanks!

I wonder if closing my ball valve will be necessary once I get a full 75 gallons in my tank. I'm only saying that because the pickup is very close to the bottom of the tank. You still think that the return flow will go to the tank, rather than re-cycling through the veg pump and veg filter?
centralvalleybiodiesel CF
1993 GMC Sierra K2500 6.5L + homebuilt veg kit, OEM glowplug failure (update: rebuilt with a 6.2 block, working fine)
1988 Ford 6.9L OEM dual tank, 90+% veg oil blend.
1989 Ford 7.3L, 80+% veg oil blend.
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Postby SunWizard » Tue Mar 25, 2008 9:54 am

No VO will flow through the pump when its off, and you are on diesel. Your diesel pump puts out at least 7psi. The return will have <1 psi no matter how full your tank, unless its elevated. Its ~0.43psi per foot elevation difference. So the 7psi diesel will be pressing against the check valve in the VO pump keeping it closed. Or your check valve if your pump doesn't have one.
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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Joined: Mon Dec 11, 2006 2:53 pm
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Postby VegMeister » Tue Mar 25, 2008 10:54 am

Oh cool, I wasn't aware how little pressure my tank would give to the veg line. My tank is KINDA elevated, it's in the bed of the truck. Which is MAYBE a foot above the IP.

So my diesel lift pump will keep the check valve (built in to my veg pump) closed... so I don't have to worry about my system looping a little while in purge mode. Thanks!
centralvalleybiodiesel CF
1993 GMC Sierra K2500 6.5L + homebuilt veg kit, OEM glowplug failure (update: rebuilt with a 6.2 block, working fine)
1988 Ford 6.9L OEM dual tank, 90+% veg oil blend.
1989 Ford 7.3L, 80+% veg oil blend.
VegMeister
 
Posts: 86
Joined: Sat Mar 08, 2008 11:12 am
Location: Pembine, WI

Postby Radrick » Tue Mar 25, 2008 2:12 pm

SunWizard wrote:The ball valve is not needed. There is no pressure in the return line, its open to your tank. Then your diagram is exactly like the one I posted in other threads: Image

There would be no problem with a few cups a few times, but it starts to add up. I use so little diesel that VO would add up in there for about 4 months and end up being too much VO% in the D2 tank.


So sun do you have a three way valve on your return? If so is it manual or electric? So in otherwords the only reason the threeway valve on the return i needed is to purge the vo return back to the vo tank instead of the diesel tank. Correct?
1995 Chevy K1500 6.5 TD not on WVO yet but soon.
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Postby SunWizard » Tue Mar 25, 2008 2:21 pm

This is not my system, I have a Dodge Cummins.

The 3 way on return is to choose either looped on VO or return to tank on D2. And it purges VO back to VO tank if you delay the return switch a little after you switch to the D2 pump.
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
Site Admin
 
Posts: 1723
Joined: Mon Dec 11, 2006 2:53 pm
Location: N. Colorado

Postby VegMeister » Fri May 23, 2008 10:53 pm

Sunwizard,

what's to prevent doing the setup you have posted above on a cummins exactly like yours? Sorry to sound so ignorant, I'm planning a conversion for a truck that I don't actually have access to yet. I think that doing the above diagram would be by FAR the easiest option.
centralvalleybiodiesel CF
1993 GMC Sierra K2500 6.5L + homebuilt veg kit, OEM glowplug failure (update: rebuilt with a 6.2 block, working fine)
1988 Ford 6.9L OEM dual tank, 90+% veg oil blend.
1989 Ford 7.3L, 80+% veg oil blend.
VegMeister
 
Posts: 86
Joined: Sat Mar 08, 2008 11:12 am
Location: Pembine, WI

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