I am no pro but those chunks in the filter. Don’t look like a hose to me. Speaking of bio diesel. I have a son-in-law that drives a fuel truck in Arizona and he said there are no separate tanks in the ground for bio diesel. Sometimes they haul biodiesel sometimes they haul regular ultra low sulfur diesel and it all goes in the same tank. So when you buy diesel, I doubt you’ll ever know what you’re getting. No matter what this stuff is, it gives me another reason that I am happy I put in the FASS on my motorhome. I have the dreaded caps pump and lost it in 2019 and shortly after I put in the FASS set up.