Setting Up A Different Fuel Delivery Set Up

[Grumpy]

The engine is a 355 carbed engine in a 87 Camaro which did have a mechanical pump on it. I put in a Carter p4594 electric fuel pump (https://www.jegs.com/i/Carter/180/P4...B&gclsrc=aw.ds) and connected the pump to the tank and the existing fuel line and at the engine I by passed the mechanical fuel pump. and connected directly to the carb. I still have the mechanical on the engine disconnected from the tank and I closed off its return line back to the tank. The electric fuel pump is connect to a fuse in the fuse box with a jumper. This car still has the computer in it from when it had a fuel injected 305 in it. The pump stays on all the time , and it runs like hell.
So could this be a computer thing or should their be a pressure switch turning the pump on and off. It says 12lb pressure at the carb , the mechanical was 4 at the most.
I always leave out information that is needed so If You need more information just ask if you would , Thank you.

12 psi at the carb inlet port will flood the carb un-controlably in most cases,
try reading these links , I'm sure it will prove useful
use of a block off plate on the chevy block after removing the non-used mechanical fuel pum and using the fuel return line on the fuel pressure regulator is the route to take

http://garage.grumpysperformance.com/index.php?threads/fuel-pressure-regulators.635/

http://garage.grumpysperformance.com/index.php?threads/setting-up-your-fuel-system.211/

http://garage.grumpysperformance.com/index.php?threads/faq-on-nitrous.59/#post-7001