Humming may not mean pumping up to pressure. Has anyone put a fuel pressure gauge on it to confirm its up to spec? One thing you can try, is to remove air inlet hose from air cleaner where it attaches to the throttle body. With key off, open throttle up and give a good spray of WD-40 into the throttle body. Now try to start it. If it fires up briefly then stalls, then you have a fuel delivery problem, probably fuel pump, but try changing fuel filter first, in case it's plugged, causing low pressure at engine. If you have to change the pump, you'll want to change the filter as well anyway.
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