It would be helpful to know what Year of 300D you have. This would tell us what type of Glow Plug System you have.
To see if you are getting Fuel up to the Injectors you can loosen some of the Hard Line/Fuel Injection Line Nuts at the Injectors and have some one else try to start the car.
If you have a Glow Plug system that has the Glow Plug Relay on the Fender Well on the drivers side of the car (US models). Remove the Plastic Cover and take a look at the Strip Fuse. In the below pic of mine my Fuse cracked and my Glow Plugs did not work at all.
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84 300D, 82 Volvo 244Gl Diesel
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