chevy 2500 4x4,auto,starts only if i spray starting fluid,than runs fine till i shut it down again,battery gets drained just sitting,fuel pump runs constant when i turn the key,have change spark plugs battery and tighten leaky fuel line.help

 

possible bad fuel pump relay.

 

what kind of fuel pressure are you getting?
pump running doesn't mean its working, could be a clogged filter.
If fuel pressure is good, then the pressure regulator may need to be looked at or the injectors.
What year?