Certain precautions should be taken when it comes to fuel system maintenance. The first step involves relieving the fuel pressure, and in order to prevent fuel leakage, a shop towel should be placed over any fuel line connections that need to be disconnected. Before starting the engine, check for fuel in the tank and look for leaks or blockages in the fuel lines, hoses and connectors. A pressure gauge with an adapter set is used in conducting a fuel pressure check on carbureted and TBI engines. Next, remove this line from
Throttle Body for carbureted and TBI engines or replace it with a Schrader valve on the fuel supply line for CMFI and CSFI engines. Afterward, start the engine depending on your engine type to find out about your fuel pressure. Perform a Fuel Pump Volume Check if Pressure is Too low; otherwise inspect for Fuel Line Restrictions if volume is insufficient. Replace the pump if there are no restrictions found. Similarly, there are some things that can be done during an electrical circuit test of TBI, CMFI and CSFI engines such as checking power at the relay of a fuel pump and power present at the connector of a fuel pump. If there is no power, then consider wiring problems or a bad relay. Pull out oil pressure switch take out resistance facing down into its hole while running engine; if engine dies out then oil pressure switch or its wire may had gone wrong.