Question about 2000 Chevrolet 3500

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Truck cranks but refuses to start, replaced fuel pump , still no luck.fuel punp is running and has pressure at the schrader valve where the fuel line goes into intake. if i dump fuel in the throttle assembly truck will start and run until it uses up that fuel. any ideas ? i did hook up a scanner but there are 0 codes. please help!

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Still don't have the answer ton how I realease the pressure on the gas line on a 2005 dodge magnum


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