You definitely need a surge tank if you want the car to drive properly. I've seen some get away without one, but they still get dramas when the fuel level falls below half. The main pump needs to be fed with 100% liquid at all times, not a liquid/air mix, which is what you get when cornering with a low tank.
Having said that, the best way to do an EFI pump for a conversion, is to not bother with an external pump & surge tank & to fit a late model pump/reservoir assembly (MRA) to your tank.
An internal pump will be cheaper, quieter & far simpler to set up.
A few guys produce a coupling ring which is welded into the top of your tank & the MRA just drops in.
A 044 Bosch is overkill for most street cars & 2 pumps & an external surge tank is more complication than you need.
Dr Terry
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