02 silverado 4.8 fuel pump
 

My engine was hesitating and now won't start, no fuel pressure at test
fitting, removed fuel pump and test on bench. In upright position it
will not run but lay it on it's side and it will. Is this confirmation
I need a new pump?
Also I get no power at connector for pump in any of the 4 pins. The
service manual says the pcm will de-energize the relay to fuel pump if
crankshaft rotation is not detected but shouldn't there be power for a
few seconds at the beginning? Thanks for any help.
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