At the moment my 1987 W124 300D is in the driveway and will not start. The engine turns over and the glow plug system appears to be working properly. It looks like the injectors are not getting any fuel. I removed one of the injector fuel lines and turned the engine over .... no fuel came out. The clear inline fuel filter has fuel showing. The tank is more than half full. The engine turns over as normal. This vehicle has always had a small fuel leak from the injection pump. Could the problem be the fuel pump? If so is there any way to test this part to confirm? All ideas?