2004 bounder, 300 cummins, 10,000 miles. Near Ft Myers Fl. Bounder would only go 30 mph. Check engine light on. Towed to cummins in Ft. Myers. Checked out engine with no results. Installed new fuel pump and sent us on our way. Went to Naples Fl. On our way home we made it to tampa with the same problem reoccuring. Towed to Tampa cummins dealer. Checked engine and found no problem Installed new fuel pump and sent us on our way. Near the Fl./ Ga. line same problem occured. we made it to Albany Ga. to the Cummins dealer. (cummins southeastern). In about 30 minutes they discovered an in line fuel filter between the fuel tank and the regular fuel filter. The in line was clogged with what looked like bad fuel.(varnish). We were finally on our way to Indy with no more problems. We had taken 3 weeks vacation and most of this was spent in cummins dealerships. Thank you cummins in Albany Ga. This is a group that is courteous and apparently the most knowledgable diesel mechanics in the south.