The problem with stock sending units and tanks has always been delivery. Venting is critical, and some fuel pumps do require a return line. Now the lower end cheaper electric fuel pumps will cause the gauge to flutter, this has been my experience. I got rid of the stock gas tank out of my camaro, and went to a fuel cell. I also bought an SX inline fuel pump and new return line regulator.My fuel pressure is rock solid, the gauge doesn't bounce. The real bonus was that i only lose 1/4 Lb fuel pressure on the top end even under the load of nitrous. So yes there is a definate gain to be had in proper fuel delivery. You may want to add a drop sump onto the bottom of your tank, if you want the stock tank? and calculate the fuel NEED /DEMAND of your current motor. then buy the correct pump etc for your application. I know many a racer who said he had no idea why his car stumbled ? till he realized he was running the bowls out of fuel by the top of first gear. The pump just couldnt keep up with the demand of the motor. Plus you have to consider when the car launches, it is creating a certain amount of force the the pump also has to try to push against. Go to the barry grant site and look at the fuel delivery section, very good info there.

http://www.barrygrant.com//bgfuel/de...1#FUELDELIVERY