Me and Tankowner are saying the same thing. You need to have a stronger battery because you need to keep cranking that thing to get the air out. So hook up your battery to a charger, build up some juice, and try again for at least 15 seconds. It took me about two attempts about 10-15 seconds in length to get it to fire. And then it fired for about 1 second and stopped. Then the next time, 3 seconds before stopping. Next time I got it going!

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1975 300D