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Old 05-02-2004, 10:39 PM   #31
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I hate when something like that happens. Well at least you got it running again and made it home safe.
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Old 05-04-2004, 08:48 AM   #32
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veggie oil conversion photo's are now in the gallery. They'e on the last 2 pages.


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Old 05-04-2004, 09:29 AM   #33
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as far as the State of Michigan is concerned, there is not tax on veggie oil. Tax is only applied to gasoline and diesel. There is no mention of other types of alternative fuel, including alcohol or veggie oil.

"207.1008 Tax on motor fuel; rates; collection or payment; exception; manner and time; imposition of rate on net gallons; legislative intent.
Sec. 8.

(1) Subject to the exemptions provided for in this act, tax is imposed on motor fuel imported into or sold, delivered, or used in this state at the following rates:

(a) Nineteen cents per gallon on gasoline.

(b) Fifteen cents per gallon on diesel fuel.
"

the act does go on to talk about marine/aviation fuel and LPG as a motor fuel. There is nothing that refrenses vegetable oil, alternative fuel, or expiremental fuel.

I wonder what the federal govt has to say about this subject?? Eventually i'll get to their site
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Old 05-04-2004, 11:26 PM   #34
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Excellent photos

Way cool! Excellent photos.

What are all the copper wires in the engine compartment? Are those going to individual injectors, or to an injector manifold (rail?) of some kind? I'm not familiar enough with diesel engines to identify what was going on in that picture.

What are you using for a holding tank under the bus?

One guy I read about provided each location where he collected WVO with an oil drum for disposal. The drum had a locking lid (rim lock, if you're familiar with oil drum lids.) When he went to collect the oil, he would remove that lid and substitute it with a similar lid that had a nipple for compressed air and a pipe (attached to the transfer hose) that reached to the bottom of the barrel. Then he would just hook up the lid to the compressed air supply he had, and the compressed air would force the WVO up the pipe and into the transfer hose.

I like the pump set up you have. Less hoses to worry with than the compressed air version. If your bus had rear heaters, you might be able to modify the system that fed them with hot coolant to run the coolant from the engine through a heat exchanger inside the WVO holding tank to heat the WVO. You'd still have to wait a while for the oil to heat up, but it wouldn't require you to create any heat for the WVO as with an electric set up.

Have you noticed any mileage difference with the WVO?

Great job!
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Old 05-07-2004, 10:29 AM   #35
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Those copper lines are the ones i installed. there are two sets. Each set has one wvo line, and one diesel fuel line. One set is connected to the inlet of the injector pump, the other set it connected to the outlet (return line) from the injector pump. I'll draw a diagram in the near future.

Under the bus, i'm using a plastic 30 (or 35?) gallon drum. It's the smaller cousin of the standard 55 gallon drum. I would like to insulate the drum so the oil heats up faster.

the wvo i've been using is really runny at room temperature. With my electric fuel pump pushing the juice tward the injector pump, i've had zero problems switching just after starting the engine, before the oil has the chance to warm up (except the few degrees it gains by going through the electric heated fuel filter)
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Old 05-10-2004, 09:40 PM   #36
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It's been a couple weeks, and a few hundred miles since the conversion. Things are ok, but not perfect. I've had a couple of problems with air leaks in the fuel system. This would cause the bus to not want to start after being parked for several hours. It was an easy fix, cracking an injector and priming the system, but this is highly annoying. I finally took apart all the veggie fuel connections and re-installed them very carefully with fresh new pipe joint compound. So far so good.

I also tried a few different veggie oil pumps to feed the oil to the injector pump. Gasoline fuel pumps apparently are not rated to pump veggie oil. Two vairations of these brand new out of the box failed within less than an hour of pumping. Currently i'm using a 12 volt diaphram type water pump rated @ 1.8 gpm and max 40 psi. This seems to work fine, but i'd like to find a replacement to make for less trouble if this one fails. I believe that early chevy light duty diesels had an electric diesel fuel pump. Perhaps i should just invest in one of those.

I'm very happy with the conversion so far. With diesel prices @ $1.78 per gallon it's nice to drive around on free fuel. I've been trying to drive the bus as much as possible for research and development purposes, but also because i love driving a vehicle that emits the lovely smell of fried food. It's difficult to convince people that the engine truely runs on used veggie oil until they get a whiff of the exhaust.
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Old 05-14-2004, 01:02 PM   #37
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I thought most places were still having to pay to get rid of this stuff anyway.
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Old 05-14-2004, 06:49 PM   #38
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I always ask before i take the used oil.

I've visited about six different restaurants now, and all of them were more than happy to get rid of the stuff. (one cook told me that i could take it if i wanted, but they have some really bad degreaser mixed in.) Here in michigan, they have to pay about 25 bucks to get rid of one container full. That's about 2-3 hundred gallons. I'm not doing them a big favor by taking it, but most restaurant owners are very intruiged with the idea of veggie oil as motor fuel. Besides, everyone loves the bus !

I have a bad habbit of looking in grease containers whenever I go to a restaurant. not all used oil is created equal !!!

If that story wasn't from such a reputable source, i'd be very inclined to think it was urban legend.
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Old 05-15-2004, 10:34 PM   #39
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I added some more photos, here are a few.
The Veggie Fuel Pressure Guage
These are the return valves coming out of the side of the injector pump

This is the veggie line zip tied to the engine coolant hoses. You can see the copper veggie line at the bottom as it enters the protective covering for the coolant hoses.
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Old 05-15-2004, 11:33 PM   #40
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photo's always seem to make things under the hood look more confusing that they are in real life. I drew this simple diagram by hand to show what i did in my conversion.


The one thing missing from the diagram is the coolant lines that are attached to the veggie fuel line all the way from the tank to the engine compartment. Actually, the veggie line is attached to the coolant lines that were already in place for the rear heater.

The next diagram shows the original design from the kit offered in the first post on this topic.


The return line in this (the original) design is connected directly to the fuel line going in. I know nothing about diesel engines, but it seemed to me that auto makers wouldn't install 15 feet of steel diesel fuel return line from the injector pump to the tank if they didn't have too. Auto makers don't spend more money than necessary. The return line is under some pretty serious pressure as far as i can tell. What happens when the fuel enters the injection pump under high pressure??? I don't know, I am not a diesel mechanic. Just to be cautious, I added the return line to the veggie tank. This way i choose which tank the fuel is returned too.

One thing i have noticed is the oil being returned to the tank is significantly hotter than the oil is before entering the injection pump, even when the veggie tank is heated up to 160 degrees or so.

Both the veggie fuel line and the veggie return line run near the driver inside the cab. I can reach down and feel the copper lines when i'm driving.
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