Does cycling the key before you start help? If it starts right up after cycling the key one or two times (try cycling slowly to let injectors have maximum spray) i'd suspect the fuel system. If it still doesn't want to start after cycling the key you might have something ignition related (crank sensor, etc.) Have you changed your fuel filter? Especially after replacing your fuel pump (possible debris).
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2005 Suzuki Hayabusa GSX1300-R
1980 Ford Thunderbird - 255 V8
ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain
hi-po Mack Truck hood emblem 
1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc.
Sold 02/06/04 
1989 Mustang GT ET: 13.304@102.29 mph (5-24-03)
Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)
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