9/22/2023 0 Comments Fuel injector oscilloscope pattern![]() ![]() The measured fuel pressure difference is generally half of measured intake manifold vacuum. Whether pressure is within specification or not, another test that should be considered basic is the fuel pump volume test. ![]() This test measures the flow rate of the pump and can help isolate fuel system restrictions or weak pumps. ![]() To perform this test, release fuel system pressure as specified in the service information and disconnect the return line on returnable systems or the supply line on returnless systems – we want to include any losses caused by as much of the fuel system as possible. Feed the line into a clean measured container, and energize the fuel pump via your scan tool or using a fused jumper wire at the relay. Measure the quantity of fuel that collects in 30 seconds. Very few manufacturers list a specification for this, but a good rule of thumb is approximately one pint. ![]()
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