I would first hold a flashlight behind each of the fuel lines while the engine is running to make sure there's no air in the lines. Beyond that, the delivery valves can be in need of a 're-torquing.

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250