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When you say " attempt " to start do you mean it stutters then stops ? Take some carb cleaner and spray it into intake. If it runs on that, then it is most likely a fuel problem, pump, ect. Check for pressure at fuel rail, and change fuel filter if you have not. Which engine ?
The power for the shutoff relay actually comes from a secondary winding on the ignition coil itself. Why the enging would shut the fuel pump off is that as the engine ran for a while the coil gets warm and then breaks down or opens up the circuit for the fuel shutoff relay. Fixed by replacing $85.00 coil.
Try looking in the area of the left rear wheel. jack it up, and use safety stand, pull wheel off, there should be a cover over it. Follow lines from tank to that area. Look for a filter in that area too, or ahead of it in the line. Get someone to turn key, just to on, and see if you hear it come on momentarily. Personally, i'd try new filter first because your going to want to change it anyway if pump needs to be done.