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If it has a relation to perkins, call Trans Atlantic Diesel; Perkins Powerpart
Big on Perkins parts and they know perkins.

 

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Perkins 4.154 manual, handbook & parts manuals can be found here:

Endeavour Manuals

There are 2 versions of the Perkins 4.154. First one was US made and the more common one was Mazda. Look to see what fuel pump is on the engine. If it is a Diesel Kiki, it's a Mazda. Same as the one used in Mazda pick ups around the world.
The people at Trans Atlantic Diesel are very knowledgeable about parts and repairs and workarounds.