Charles & Sandra Cohen
The solenoids on the injectors will need a fair bit of fast-rise-time current, so they'll be a good source of RFI.
. . . Have you tried putting clip-on ferrite chokes on the wires to the solenoids?
That worked (for me) to reduce alternator hash.
. Charles / VA7CPC
PS -- I had a Volvo diesel in my boat, not a Ford diesel in my truck. The Volvo used traditional, mechanical high-pressure injectors.