Honda Civic 1992-1995 EG Fuel System: injector, pumps and more

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Click on the link to see the complete article with images check it out here: Honda Civic Fuel System. Garage411.com CAUTION: Always relieve fuel pressure before disconnecting any fuel injection related component. DO NOT allow fuel to contact engine or electrical components. Fuel System Pressure Release Remove negative battery cable. Loosen fuel tank filler cap. Locate 6-mm service bolt on fuel filter. Place clean shop rag around service bolt. To relieve system pressure, slowly loosen service bolt one complete turn. Always replace washer under 6-mm service bolt after loosening. Fuel Injection Fuel system consists of an in-tank high pressure electric fuel pump, main relay, fuel filter, pressure regulator, injectors and injector resistor(s). This system delivers pressure-regulated fuel to injectors and cuts fuel delivery when engine is not running. Fuel Pump Fuel pump consists of a DC motor, a circumference flow pump assembly, an internal relief valve for protecting fuel line system, an internal check valve for retaining residual pressure, an inlet port and discharge port. Pump assembly consists of impeller (driven by motor), pump casing (which forms pumping chamber) and pump cover. Fuel Pressure Regulator Fuel pressure regulator maintains proper fuel pressure to injectors. Regulator uses manifold vacuum to sense engine load and modifies fuel pressure to maintain driveability. When manifold vacuum is high, vacuum diaphragm is drawn back, overcoming spring pressure. Excess fuel passes through pressure regulator and is returned to tank via fuel return line. When manifold vacuum decreases (engine load increases), spring pressure closes off return passage, thereby maintaining fuel pressure and volume. Injector Resistor(s) Injector resistor(s) lowers current supplied to injectors to prevent damage to injector coils, allowing injectors a faster response time. Main Relay Main relay contains 2 individual relays. One relay is energized whenever ignition is on. It supplies battery voltage to ECM, power to injectors and power for second relay. Second relay supplies power to fuel pump. Second relay is energized for 2 seconds when ignition switch is initially turned on and when engine is running. FUEL CONTROL Programmed Fuel Injection Programmed fuel injection system is controlled by Powertrain Control Module (PCM). The basic fuel injector duration is built into PCM memory. The PCM modifies basic injector duration according to input signals from various sensors to obtain final injector duration for fuel delivery. Fuel Rail and Injector Fuel injector consists of a solenoid, plunger needle valve and housing. When current is applied to solenoid coil, valve lifts and pressurized fuel is injected close to intake valve. Since needle valve lift and fuel pressure are constant, air/fuel ratio is determined by time valve is open (duration of current supplied to solenoid coil). Injector is sealed by an "O" ring and seal ring at top and bottom. All seals, "O" rings and rubber mounts reduce injector operating noise and heat transfer. Removal Relieve fuel pressure. See beginning of page. Disconnect electrical connectors from injectors. Disconnect vacuum and fuel return hoses from fuel pressure regulator. Place a shop towel over hoses before disconnecting them. Loosen retaining nuts on fuel rail and harness holder. Disconnect fuel rail. Remove injectors from intake manifold. Click on the link to see the complete article with images check it out here: Honda Civic Fuel System. Garage411.com

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