Algea?

[Rawze]

(03-21-2018 )Rounded_nut Wrote:  Not gelled, it was around 50 degrees out, yeah rawze that's what I thought too. Here's a picture of the fuel in the tank just before draining.

looks like someone added cooking oil to the tanks. - Cooking oil is not a very good fuel for a bigger diesel engine.

Rawze Wrote:Vegetable oil, also referred as VSO (Straight Vegetable Oil), when added to, or used as diesel fuel, has very similar qualities and efficiency, but, like other additives, there is a problem with it. It leaves a higher content of carbon buildup on all the engine components, resulting in excess wear long term. It also seems to not have any benifit to lubricating the fuel system components, and can attack and destroy seals over time. Vegitable oil also has a much higher viscosity than diesel. This means that it will spray into the cylinders with bigger droplets and tends to cause a higher rate of 'coking' (gumming up) the piston rings over time, reducing the oil's effects of lubricating them. Not very good for putting in your truck if you ask me.

(reference) - http://rawze.com/forums/showthread.php?tid=112