I cleaned my fuel system, replaced the hoses and filters. Before that my fuel was a dark blue and kinda dark gray. I found a silvery paste in my tank when I cleaned it which I'm still clueless about after asking this forum. After that I put clean diesel in and it showed a clear yellow color in my primary filter. Great.

Well now my fuel is slowly beginning to turn into a blue color and constantly getting dark, turning back into the old color of diesel that I had. Does anyone know what's going on??

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1983 300D turbo diesel