Cheap fuel pumps

I have no gasoline smells, so don't suspect a leak. Could it be that these new-design pumps have a less effective internal check valve than the old ones, such that the new pumps slowly bleed off system pressure back to the fuel tank?
I also have the new E85 capable Bosch 044 and I am having the exact same symptom. -No smell, no leak, but drops the pressure after a while after shutting down the engine. The pump obviously bleeds fuel back into the tank. I've set my ECU to always prime the fuel system during startup so my injectors are always pressurized during startup and engine running. I have no problems so I will leave it as is.
 
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