Im not sure tbh, the accumulator is supposed to maintain fuel pressure when the engine is off, and acts a bit like a capacitor. If the fuel pump see's a very brief lack of fuel then I think the accumulator would maintain pressure. However this would be a very brief event. As Karlos says pressure should be equal through out the system, this would be true for a longer 'event'.

If the accumulator had a one way valve on its intake it would work.

Rob,