How to drain gas tank in1998 GMC 1/2 ton Truck Sierra (to many gas pump failures, 2)?

Ordinary Guy

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I am scrapping my truck and my gas tank is full, 100+ litres. Syphoning through gas filler pipe does not work. I have removed the gas line filter and connected a hose to the tank side. By turning the ignition on and off I can activate the gas pump in the gas tank for 5 seconds. This takes about 1/2 hour to fill a 20 litre gas can. Is there an easier way? There is a gas pump relay in the fuse box.
 


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