Looks like hard calcium deposit no idea how you would get that in your tank without someone putting calcium tabs in your tank though. also if you think someone is pouring sugar in your tank id get a diesel cap with a lock.
1995 GMC SLT K2500 6.5LTD stock hauls *** anyways
1956 massey ferguson tractor 10.8l no name diesel
1976 105l GE diesel mounted on a 575kw 3phase gen
2014 dodge lariet 3500HD <--- the toy
For the diesel babies out there black smoke with any diesel engine is bad and particularly annoying....