On the C32 AMG forum we have establshed that its fuel "delivery unit" in the gas tank is unlike the stanard C-Class W203, having a 2nd pumps inside its module to assist high flow. The comes the following thread:
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" 09-14-2009, 12:40 AM * #16
Solols
Join Date: Sep 2009
Drives: 1963 300SE Cpe & Fintail & C32
"hothbl, sounds like you are the first person on the planet to delve into the mysteries of the C32 fuel delivery pump! I suppose this is a sign that they're not failing often. Were you able to repair the module you opened? I hope so as that second pump in the module triples M-B suggestion retail price. My dealer sez it will cost $1,200, vs. $460 for a C320 "delivery unit". That should be able to fix a lota' innards! Is there room in there to upgrade a C320 pump for C32 engines? Anyone know if the C55 and C63 also use a double pump module to ensure sufficent fuel for the regulator (in the filter) with pedal to the metal? Might be a repair service worth perfecting. I'll be customer #1."

Response to this thread has been zero. Are there any AMG gearheads elsewhere on MBWorld that can add to the thread or Solols's questions?