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A quick note: Whenever you do the pump or injectors, you have to prime the system several times for the system to hold fuel pressure.
If the lines were backward, you would either be seeing a ton of pressure (well over 70psi!) or zero pressure at the fuel pressure gauge. So if you are seeing around 43psi (a stable/consistent 43psi while priming, which lasts around 7 seconds if I remember correctly), there is a good chance the lines are routed correctly. It is pretty evident if the lines are routed backwards as the pump will struggle to make pressure (sounds like a rundown motor or a motor with not enough voltage. Basically a struggling pump is what is sounds like and much different from what you are used to hearing when the system is primed).
I have had to do this 3 times in the past month while going through 3 different sets of injectors! Thought my brand new Aeromotive FP regulator was shot. However, you need to prime the system multiple times in order to remove and bleed all air out of the system.
Go ahead and prime the system (cycle it 4-10 times) and see if it begins to hold pressure.
A faulty fuel pressure regulator will simply not hold pressure.
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