If the little Nipples on the Injectors are bent inwards towards the Injector Body it is difficult to get the standard Fuel Return Line onto the Nipples.

Leave about 1/2 inch of the Fuel Return Line/Hose sticking out and gently grip above that with a Pliers and use that to push on the Lines.

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84 300D, 82 Volvo 244Gl Diesel