Did the smaller clear filter look black. You seem to have a problem with fuel and I believe it is the strainer in the tank. This will go away if you fill up but only until the fuel is used down to you 1/3 tank then it wil resurface. The best way to address this is to drain then tank and clean/replce the strainer. If you don't get black stuff in the filter then remove the filler cap to the fuel tank and blow air into the hose that connects to the small filter. This will clear any obstruction that might occur. Do so pnly briefly so as not to blow fuel out of the tank.

If you clean/replce the strainer and find it gunked up then be sure to add an algea killer to your tank.

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1977 300D Lost coolant while someone else was driving
1983 300D Can't run without oil
1985 300SD (gone but not forgotten)
1990 300TE 4matic Sold
1991 Yamaha Venture
1975 Kawsaki 250 triple
1974 Honda 200CL
1951 8N Ford
2008 Wildfire 650C