Is it possible to replace the delivery tower o'rings without removing the intake manifold?

Kubota?

Which engine? If the 601/2/3, yes it is. Remove the hard lines and you'll have *JUST* enough room to get in there and work.

__________________
Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

thanks