Testing the fuel pump requires measuring the delivery volume at system pressure. This is done by attaching a hose to the return line fitting on the fuel distributor on the Bosch K-jet system, or to the return line fitting on the external fuel pressure regulator on the Bosch KE-jet system. When this hose is connected and directed into a container, run the fuel pump for 30 seconds and measure the amount of fuel in the container. You should have a minimum of 750cc to 1200cc of fuel in the container (this figure differs by model of car). If you don’t get the specified minimum amount for your car then check for problems or blockage in the fuel delivery system.