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Old 04-22-2013, 09:07 PM
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Using drain port on tank for return

my aluminum tank was welded up with 2 "drain ports" on either side at bottom of tank. i am considering plumbing one of these ports for my return. my questions are:
1. will there be too much head pressure to allow veg oil back into tank? (i need a 101 coarse on fluid dynamics.)
2. would a check valve be a good idea so that line is not "back filling" from tank to where line terminates at purge valve?
3. the folks at wvo designs seem to think it will be fine (and preferred) to route return oil to drain port over T ing back into supply line on suction side of pump. i just thought i'd get some other opinions and/or more info before i decide on one over the other. thanks for your thoughts!
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Old 04-23-2013, 07:55 AM
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dont think it will work, bro. There would be too much pressure (gravity) from the wvo itself, for the return fuel/wvo (under no pressure at all) to overcome the c.v.

My "return" is at top of tank, which i just drilled a hole, and but a 90* fitting thru it, nutted on the inside.
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Old 04-27-2013, 05:12 AM
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It will work under d2 pump pressure at purge, but I would do what T-boy has advised, for two reasons.

First, my return/PV is plumbed to the top and I had a Delrin purge valve start failing slow after 20k, with a pretty constant drip. No big deal when running veg as it just cycled veg, but I did a bunch of intown short trip driving on d2 with a ton of idling and in my system config, this was putting a constant drip of d2 into the veg tank...almost overflowed the bugger... only thing that saved me was I "heard" the drip when I was trying to figure out why I had more 1/4 tank more of veg in the tank than I should have.

Second, is a personal one, but I didn't want an opening into my 100gal tank below oil level without a manual valve "closed" in all cases. If a hose failed or something stupid happened to the return line config, you dump the entire oil load. This is not from experience, but this is the reason I plumbed mine to the top because we are relying on a 12v PV to hold back the load of oil and hoses/fittings break...o-rings fail.
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