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That appears to be where my leak is, so I guess I will start with tightening it, because it might just be loose, since I had not tightened. Thanks, jbayer, for the links and o-ring sizes.

The IP on my M756A2 has been leaking since I bought it 1.5 years ago, and recently the dribble has turned into a spray. Now the driver side of my truck is getting coated with diesel fuel. So, I searched this forum for info on replacing the seals in the HH. I found Grainger no longer stocks...

Yes, I agree, a centrifuge is essential equipment, especially when burning WMO, so that the sediments are removed efficiently. Otherwise it can literally take months of settling WMO blends to get all of the sediments out, because WMO's main problem is it is a colloid of soot and motor oil...

I find blending gasoline with waste oils has many advantages. However, when blending any solvent with waste oils there is likely to be a precipitate, so it is always wise to get good at removing the light blend that floats above from the sediments that settle to the bottom. Otherwise there...

Andy3, I have been running a 1983 Chevy G-van with a 6.2L diesel engine in it on gasoline blended with WVO almost exclusively for 8 years, which was only about 10,000 miles, because I live in a small town, and tend to walk or ride a bike, so I do not drive much. For the most part I have had...

That is a very useful set of photos. The second photo is easier to see yellow residues on your valves. That yellow residues on your valves is most probably sulfur. Sulfur is a common additive in motor oil, because it increases its lubricity. However, WMO ends up leaving that sulfur deposited...

Viscosity is a good measure of whether a waste oil-based fuel will run in a diesel engine. So, is measuring its specific gravity, and measuring its specific gravity is easier and cheaper. No filter will remove all of the sediments in WMO, because the sediments are often submicron in size, so...

Those who successfully recycle any waste oil into diesel fuel generally blend gasoline with the waste oil at 20-30%, then leave it to settle for at least a week, then separate the sediments from the waste oil, before centrifuging and filtering. Thus, no heat is needed.

I do not happen to believe that acidification takes place with heavily burned WMO, but it might. However, my data shows that a fraction that melts at 160F (71c) occurs, and I believe it is the product of polymerization due to excessive heating, number of heat cycles and age. A centrifuge will...

Thanks, dmetalmiki.

Here is a link to my system on YouTube, http://youtu.be/UGtTDr0FKKM

If you are processing WMO blends, then a centrifuge not necessary, but desirable, because WMO is a colloid of soot in motor oil, and that colloid is made up of ultra-fine carbon particles that are suspended in WMO. You can remove it by settling after blending with gasoline at 20%, which will...

Another option for removing water from a large quantity of fuel is to purchase a few pounds of silica gel, and put it into a nylon stocking, and tie a robe around the end of the stocking, then lower the stocking down into the bottom of the fuel pod, then just leave it there over night. Next...

Good to know that you found a solution. I do not know how the water got into your fuel pod. Another possible solution is using a Banjo. 2" PP Y STRAINER WITH 120 MESH SS SCREEN I have used them for 7 years now, and I am very happy them. When the plug up, or you are done, then you can easily...

Blending diesel fuel with waste oils really does nothing but slightly dilute the waste oil, while thickening the diesel fuel; whereas, blending gasoline with waste oils at about 20% significantly thins the waste oil, and it remarkably good at precipitating out the water in the waste oil in a...

I have been running fryer oil, otherwise known as WVO, in a 1987 Chevy van with a 6.2L diesel for over 7 years. I have been running it on a deuce for one year. To make waste oils work as diesel fuel I blend them with gasoline, then settle the blend for at least 2 weeks, then separate out the...

Thanks, m16ty, and welldigger, for your contributions. I get that normal 1/4" compression ferrules will work, and therefore I will give it a try. I will get back with my results. I will of courser use tubing that can handle a wide range of solvents. Since I make my own fuel out of blending...

Sorry to revive and old thread, but I am about to repair the leaky return lines on my M756A2. From the photo at the top of this thread it looks like the same compressions sleeve for a common 1/4" compression fitting available at any hardware store. Can someone confirm that please? Also, the...

This makes sense, so the white layer might be gelled biodiesel. Yes, I agree. This is useful information, thanks.

If you know that the 50 gallons was originally diesel fuel, then you could pump it out into a barrel, then add gasoline to it at about 5-10%, do not agitate it, then leave it to settle for about a week or two, then pump the top 90% off into your fuel tank, and you should be good to go. The...