Residue in bottom of fuel tank

[beerman]

Does anyone know what this is in the bottom of the tank and why it is in this pattern?

[brute4c]

The pattern is most likely just the wave action of the fuel moving around the sediments as the truck moves...looks like stuff I have seen on rocks in places where sediments settle out...so just natural effect making the pattern...

What it is? Well, we have had members talk about sandy like stuff that pollutes their tank down in Texas and Oklahoma...seems to come in with the fuel from places that get junk in their underground fuel tanks...maybe that is happening somewhere in your neck of the woods or maybe someone ran too deep in dirt/mud and got some in there...hard to say...

Would definitely clean it out and while you have the tank empty, it is a good idea to blow compressed air from the line to the fuel pump, remove it on the pump end, and blow back to clear the line and get the sediments off that prefilter on the tank suction line...they can get nasty over time...