If he has no Hand Primer on His Engine He needs to replace the Fuel Pressure Relief/Overflow Valve from one of the Engines that also does not have the Hand Primer. The reason is that on the Engines that came with no Hand Primer the Fuel Pressure Relief/Overflow Valve is setup with an Air Bleed.

The 617 Valve may Fit and it may work untill Air gets trapped inside of the Fuel Injection pump Housing. With No hand Primer and a 617 Fuel Pressure Relief/Overflow Valve before He cranks the Engine He would need to loosen the Fuel Pressure Relief/Overflow Valve crank the Engine and allow the Air to get out. Tighten it up and try to start.

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84 300D, 82 Volvo 244Gl Diesel