CHEVROLET TRUCK LOW FUEL LIGHT

My K-1500 Truck Just Started Hesitating On Accelertation. If I Feather The Gas Lightly It Does It Less, But When I Try To Accelerate...

I Have A 1989 Chevy Suburban With A 6.2l Diesel Engin I Can Not Get It Started. I Got It Started Once For About 5 Seconds Then It Died Again...