I believe there are baffles in the tank which help to keep the fuel accessable to the pump at low levels. I have heard of these breaking loose in the tank allowing the fuel to slosh around during turns which could cause the pump to starve at times. Someone correct me if I am wrong here.
You have stated that you've changed the tank and pump so that may not be the issue.
I imagine you have replaced your fuel filter, it might not make too much difference unless it is highly restricted by debris.
Have you checked your fuel pressure regulator for leaks?
You should get a fuel pressure gage, attach a length of hose with a fitting on the end to connect to the schrader valve on your fuel rail, tape the gage to your windsheild so that you can observe it while driving. Drive the car with the tank at various fill levels and check the pressure. It should remain somewhere in the 30-45 psi range. If it does not then you have a problem with either the fuel pump (still), regulator or restriction in the lines.
You have stated that you've changed the tank and pump so that may not be the issue.
I imagine you have replaced your fuel filter, it might not make too much difference unless it is highly restricted by debris.
Have you checked your fuel pressure regulator for leaks?
You should get a fuel pressure gage, attach a length of hose with a fitting on the end to connect to the schrader valve on your fuel rail, tape the gage to your windsheild so that you can observe it while driving. Drive the car with the tank at various fill levels and check the pressure. It should remain somewhere in the 30-45 psi range. If it does not then you have a problem with either the fuel pump (still), regulator or restriction in the lines.
