fuel pressure problem

[69ptcamaro]

I have also read a lot that the return line should be at least the same size as the supply line.

Hmmmm..... We have conflicting information. Pretty much everything I have read on the forum and web gave different line sizes for supply and return in respect to horsepower. Here is one site that I believe to be accurate. http://john.my67.net/efi.htm I could most definitely be wrong. I only know what I have read, and I could have read incorrect information.

[Hammered]

Here is one site that I believe to be accurate. http://john.my67.net/efi.htm

That's my site and I pulled that info from Holley.

Regardless, low pressure is not a return line problem. I would drop the tank and take a look at the pump. It should have a check valve that holds pressure after shutting the car off. That and the low pressure on acceleration could be a faulty internal fluid connection.