08-27-2013, 09:16 AM
Looks to me like algae contamination which is similar to coffee grounds. This frequently happens in boats that sit for awhile with untreated fuel. Most large marine service firms can polish the fuel to clean out the dead algae. I treat my fuel with Fuel Prep 1000 anytime my coach sits for more than two weeks in a hot climate.
2001 Newell #579
tow a Honda Odyssey
fun car: 1935 Mercedes 500K replica