Do not start the car until the air is purged out.
You will need to bleed the air out of the system. The Hand Priming Pump is on top of the Fuel Supply Pump on the side of the Fuel Injection Pump.

To find the Fuel Supply Pump trace the hose from the filter back to it. The Hand Primer will look like a 3 inch long Aluminum tube with a hard plastic knob on it. Unscrew the knob only and pull up on it. Pumping it up and down pumps fuel through the Filter and Fuel Injection pump. When you are done push it all the way down and screw it snug to prevent air leaks.

If you do not see the 3 inch Aluminum tube you may have the updated type of hand primer covered with a Black or Gray rubbery substance. With this on you only have to push down on it and let the return spring bring it back up and keep doing that to prime the system. When you are done just leave it alone.

How many times to pump? If you listen carefully you will hear a buzzing or faint squealing sound as the air is purged out. After you hear that sound and it is quiet you can stop pumping and start the car.

If you want to see what the parts look like try going to one of the online parts sellers and doing a parts search; they often have pictures.

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84 300D, 82 Volvo 244Gl Diesel