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To measure fuel delivery one installs a pressure gauge and removes the fuel return line from the fuel pressure regulator. You then bypass the fuel pump relay verify fuel pressure at 5.3-5.5bar and catch the fuel coming out of the regulator. Should be something like 1 liter in 40 seconds. Both pressure and volume are critical, especially pressure.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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