I would suggest that you remove the filter and check that there is no forein matter on or around the seal, when you screw the filter housing tighten it a little at a time and rotate the housing a little each time, this should ensure that it seals properly.
The actual primer can also leak air, don't know whether that year had a rubber bulb type or a plunger, on the latter the diaphragm can fail.
The join with the plastic fuel line and the metal pipe that goes to the tank can also fail, the plastic often cracks, this should be just behind the engine.
If all else fails try parking the car on a steep downward slope, if you can get the fuel tank above the engine you may be able to see diesel leaking out.
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