91 chevy k1500 seems to starve for fuel
 

My truck seems to be starving for fuel when i have it more than half throttle when driving it... I know the fuel pump is supposed to whine when you turn the ignition on but mine doesn't... So my question is if my truck is not running worth a sh*t with more than half throttle and the fuel pump is not whining do you think my fuel pump is not suppling enough fuel???