Fuel Pump
On Q45, disconnect fuel pump harness connector, located in trunk. Measure resistance between fuel pump terminals No. 1 and 3. See Fig 1. On G20 and I30, disconnect fuel pump harness connector, located under rear seat. Measure resistance between fuel pump terminals. On all models, resistance should be 0.2-5.0 ohms at 77°F (25°C). Replace fuel pump if resistance is not as specified.