Well I filtered about five gallons of WMO and truck was hard to start a few times so I changed fuel filter. Then I ran 15 gal of filtered WMO and truck ran fine all weekend. Now on Wednesday it is being a bear to start. Have to hold the throttle and crank for a while before it will start. It blows smoke rings and puffs alot before it starts up. When it does start it runs real rough for about 20 seconds and then takes off and runs fine. I am thinking that this is more of a fuel return line issue than a WMO issue. Any input? Im afraid my starter wont hold up much longer like this.

What is WMO?

Waste Motor Oil

Don't know. I have never tried running it at that ratio. Try cutting back on the oil a bit.

Do you mean 15 gallons at a time?

If so, may I be the first to say WHOA THERE![dummy]

I never tried over 5 gallons to a full tank, just never had the need or nads to do it.

I would suggest taking it down a notch, something closer to 10-15%.

Well I understand that 15 Gal a tank may be a little bold. I wouldnt have done it if I hadnt had some other 12 valve guys say they were running up to 90% WMO. I will for sure cut down after this just because of the smoke factor. That thing huffs white smoke like crazy and seems to draw attention. I am more concerned about the starting problems right now. I know I should replace the return lines. I was just wondering if anyone else had similar problems after using WMO or if it was something different.

I used about 5 gallons (25%?) once or twice and it did seem to take a couple seconds longer to start. I am still looking forward to trying a 50/50 blend. I doubt I would go higher.

Of course, if someone told me that they would run on chocolate milk I'd probably dump in a gallon and see... [duhhh]

When I mix WVO in my tank about 8 gals to a fill up of 24 I notice a hard start and rough running once and a while. Solves itself after 20 seconds of running. my feeling is the fuel gets to thick in the lines and pumps. This problem for me is more common in cooler weather.

i've run up to 90% wmo in my 90 ford idi with the hard to start problems but then she runs fine 70% is about all she wants to start on in the cool mornings.

Well it started up just fine leaving work yesterday and this morning. But on the way to work she stuttered a couple times. I went ahead a topped it off with #2 so hopefully I can just keep diluting the mixture until it gets right. Wont do 50/50 again. I need to replace the lines as well.

Yeah, when I get up in the high percentages, I have to touch the accelerator pedal for the first morning start. One thing I will say-oil aggravates any existing fuel system problems you already have. So, if your fuel lines need replacing, it'll draw even more air in on oil, since the oil is thicker and it must develop more suction to pull it through the line. Same with restrictions-if your in-tank pickup is plugged, or any other screen in the system, it'll start sputtering on the top end from fuel starvation.

In the WVO world, we have to heat the oil to thin it down so the viscosity matches dino fuel. Your WMO is too thick when it is cold to inject properly, so you have crappy start up problems. Think of squirting butter out a windex bottle. Other problems may occur in time due to bad spray patterns during the cold engine operation, until it warms up. Your ratio of oil to diesel is too high, thin it out a lot, start from there. You can slowly add oil until your engine starts to complain, then cut back. Summer ratios will be different from Winter. When you do add your WMO to the diesel, I would pre mix some of it. If you just dump it in the tank, it does not really mix, it will settle to the bottom. Sloshing it around by driving will not mix it.

Do you know the history of the oil you used?
Synthetic oil causes the problems you describe.

I do know who I got the oil from, a friend who changes his own oil. Dont think he uses synthetic. Will find out for sure. What size is the fuel line replacement? 3/8"?

I think ya need to tap the brakes on putting so much oil in your tank - even if some 12valvers are actually running 90% :o (I'd like to hear more about THAT)

I don't think WMO is worthwhile or cost-effective unless you have ready access to a steady supply of it... then it'd make sense to mod your engine/driving habits to accomodate it.

Whenever I change the oil in one of my vehicles it goes straight in the tank. No filtering about a gallon and a half in a tank of diesel. No problems at all except for a little extra smoke which I think is from the extra soot in the oil. It didn't burn the first time so it won't burn the second time.

Edwin

Well Im pretty much done with it. It sounded great when reading about it and I thought I could save some cash. I did replace the return line and the truck starts fine now. I am just tired of the smoke, the smell and the dirty looks. Diesel is down as low as $2.55 in Dallas, Ga so it looks like things are getting better. FOR NOW!

Don't blame you Tex. I generate about 300 gallons of waste oil a year.
Not one ounce is going in the fuel tank of any of my tractors or trucks.

I wish you could get that 300 gallons from you. I just now filled my 91 gallon aux tank up with filtered waste oil, and I'm going to hit a couple of repair shops up for some more. Tomorrow I start pulling fema trailers, possibly for as long as a week. Fuel is the single biggest expense when doing this. I've been running high concentrations of oil for quite some time now-it smokes like hell at idle, but clears up going down the road. Admittedly, mine is a 12v, but the later pumps can tolerate some too, possibly up to 100% from what I've heard. I do know that my engine quiets down at idle when even a little gets put in the tank.

I have noticed a couple of bad effects besides the smoke at idle-my wallet has gotten heavier, and I also have to deal with larger numbers when balancing the checkbook. Lastly, I haven't seen the nice old lady at the gas station near as much. Those are the fearsome side effects of running waste motor oil. You guys are right-you better not try it.

Believe me when I say that I would love to save a few dollars here and there. Now the excess smoke may be because I used a 50/50 mix, but I have a remote start and as I walked to the truck I hit the button. There was a woman parked on the passenger side of my truck putting her groceries into her trunk. She had to walk away from what she was doing with her shirt over her nose and wait until I left so she could finish. I felt terrible and embarrased at the same time. I just dont think it will be very long before Johny Law sees the excess and pulls me over to investigate. Not something I want do deal with. Anyhow, I wont be running such a heavy ratio in the future, regardless of savings.

There's a few on here would consider it a religious experience to smoke out a poor old grocery-bag lady like that, especially by accident - cause then it's OK for sure, right? ;)

(not you TXWelder - we kno R tX kin wuz razd wit maners!) [laugh] [laugh] [laugh]

I added one quart of WMO at my last fillup.
I can now fog an intersection like I was running stage three gazillion injectors. :(
Stock injectors and a HR-VP & I don't even have the injector pump wire connected on my Comp.
It might just be the cooler weather adding to the problem........
I won't be adding it again anytime soon.

I like to blow a little smoke just as much as the next guy, but I want it on request, not just because the truck is running. I dont know about yall but when I see a truck smoking at idle to the extent that mine does, I tend to think the individual either needs a new ride and cant afford one, or doesnt have the first clue about maintaining his vehicle. Maybe its silly, but Im kind of pridefull about it.

I have been adding WMO at a ten percent rate for quite some time with no ill effects.

I have the advantage of three seperate fuel tanks; and, if I so desire, can add heavy concentrations of WMO to one tank, using another tank for initial start-up and shut-down.

How do you switch between the tanks? I'd like to do that with at least two, as mine starts and runs cold better on diesel than oil. If possible, I'd like to be able to switch and have the fuel change reach the injectors quickly enough to change to diesel at a traffic light, then back to oil again running down the road.

How do you switch between the tanks? I'd like to do that with at least two, as mine starts and runs cold better on diesel than oil. If possible, I'd like to be able to switch and have the fuel change reach the injectors quickly enough to change to diesel at a traffic light, then back to oil again running down the road.

That won't work, because the fuel volume in the supply circuit will take minutes to be injected...

I think a "dual fuel" system should have two separate filtered supply lines directly feeding the IP.

Setting up a two tank system is not hard. First, another tank. Then a 3 port solenoid switch. Check out Plantdrive.com for one. Hook up diesel "in" to one port, WMO "in" to another (prefiltered of course), with the "out" going to the lift pump. However, FWIW, I do not recommend straight WMO to be injected, it is way too viscous to have a good spray pattern. I would thin it down by adding good percentage of diesel or add a lot of heat. There will always be a delay before as one fuel must purge the other in the lines. This is the basic system we use to run WVO, except we add a lot of heat and in line filters. A word of caution, if you run a lot of WMO, WVO, or whatever, be careful about your return line as it can overflow your main tank since you are not using it.

I checked that site out-their stuff looks overpriced. However, the 3 port solenoid switch gave me the idea of trying to find one cheaper locally. I know of a couple of stores that just might stock such a thing.

on my f250 it takes just 2 miles to purge the fuel lines I found that out once when I mixed 90% wmo 10% dino & she did not want to start cold so the rest of that tank I switched to the 70% wmo rear tank & she cold started just fine.