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FUEL ACCUMULATOR: Damps fuel-pressure surges and holds residual pressure in the system when the engine is shut off. Damping action protects fuel distributor from the rapid build up of fuel-pressure during start up. When the engine stops, the accumulator holds fuel pressure to help prevent vapor lock, and improve hot starts.
If your thinking the mix should be richer on cold start, then examine the control pressure regulator..it has the bi-metal arm and electrical winding in it that is manipulating (or should be) the mix in the first place. It's located on the engine block-left I think-next to one of the intake runners--square. Originally called the WUR-warm up regulator.
These are quotes from the book I mentioned
"how to understand, service, and Modify--
BOSCH FUEL INJECTION & ENGINE MANAGMENT
by Charles O Probst, SAE
Bentley publishers
/http://www.rb.com
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