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Sounds like a fuel pump problem. Check for power at the fuel pump inertia switch with it plugged in on the DARK GREEN/YELLOW striped wire and the PINK/BLACK striped wire while cranking the engine. If you do it with the key on, you will only get power there for 3 to 5 seconds. If you have power, then the fuel pump is the problem. But if not, then we need to look back at the relay, fuse and wiring.
If you have a couple of friends to help you lift the bed off, it would be easier. Other wise you will have to lower the tank. A mechanic will charge 2.0 flat rate hours to replace the pump.
You can reply back on this page. Not sure if it will stay open for a few weeks thogh.