The injector 3854518 is indeed obsolete. I haven't been able to find anyone that
has one of these or able to recommend a replacement.
However, Mercruiser had a 1997 7.4 MPI that used an injector with a part number 805225A1.
This number 805225A1 is also obsolete from Mercruiser, but I do have four new of these in
I believe, but I can't promise this, that you could use this injector. If you could give me all
of the numbers on your injector I can compare them with the numbers on my Merc. injectors.
I think the same manufacturer made them for both the Volvo Penta and Mercruiser version.