Quote:
Originally Posted by RarlyL8
The accumulator is a surge tank. The -044 pump is a common uprgade that has been used in front, rear, or both. Any position will relieve the remaining OEM pump to some degree. As with all performance mods the system must be verified in spec after the mod and tuned/adjusted as needed.
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This is incorrect information.
The CIS fuel accumulator is not a surge tank.
Surge tanks are installed before the main pressure fuel pump(s) and the surge tank is supplied fuel from the main fuel tank by a dedicated seperate fuel pump.
Their purpose is so when the fuel tank or fuel cell in a race car is almost empty the the main fuel pujmps will still have a steady non intermittant fuel source to draw from during hard cornering and not be starved for fuel when the remaining fuel in the main tank moves away from the fuel pickup.
935's and 962's had two fuel pumps in parallel feeding the surge tank that looked like the same fuel pumps that were in the old bosch mechanical fuel injection Mercedes cars from the late sixites before they started using CIS in the early seventies.
Then they used 3 bosch fuel pumps in parallel that look a lot like the rear bosch fuel pump in the 930.
They used more fuel pumps than needed to run correctly mounted in parallel in an aluminum frame in case one failed during a raceand with 3 pumps the car would keep going and not be a DNF.
The 930 fuel tank has the plastic swirl pot in the bottom of the tank with the fuel pump pickup in the middle to keep some fuel available to the fuel pump during hard cornering, braking, and acceleration when the fuel level is low.
Race cars use a rubber fuel cell full of pieces of special open cell foam rubber to keep fuel from sloshing around during lateral G forces while driving..