Fuel Pump Relay Switch Location
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Disclaimer: This photo is sourced from many relied on internet sites, photo copyright depends on the proprietor of the photo, we do not acknowledge this picture as our residential property or work.The main reasons for the fuel pump being located in the fuel tank are: (1) to keep the fuel pump cool while it is operating, and (2) to keep the entire fuel line pressurized to prevent premature fuel evaporation. Inertia Switch. On Ford products, an On EFIequipped trucks, the inertia switch is located under the dash. Oil Pressure Switch. In a latemodel General Motors fuel pump circuit, the powertrain control module (PCM) supplies voltage to the winding of the fuel pump relay when the A reset button on top of the inertia switch must be pressed to close the switch and restore fuel pump operation. The inertia switch is located in the trunk area on most Ford cars. A decal in the trunk of latermodel cars indicates the inertia switch location..On EFIequipped trucks, the inertia switch is located under the dash. Oil Pressure Switch. In a latemodel General Motors fuel pump circuit, the PCM supplies voltage to the winding of the fuel pump relay when the ignition switch is turned Battery Starter relay To fuel pump Starter motor Oil pressure switch topen during run1 Figure 866 While the engine is running. current flows through a fuse and resistance wire to the fuel pump. Inertia Switch. On Ford products. an inertia switch is On EFlequipped trucks. the inertia switch is located under the dash. Oil Pressure Switch. In a latemodel General Motors fuel pump circuit. the powertrain control module tPCMi supplies voltage to the winding of the fuel pump relay when the 30 31.Pin Function 1 Drives Fuel Pump Relay 7 Drives PGMFI Main Relay 8 Drives Oxygen Sensor Heater Control Relay 9 Detects Ignition Signal 15 Detects Electrical Load Detector Signal 18 Drives A/C Clutch Relay (optional) 22 Detects Brake Pedal Position Switch Signal 26 Engine Speed Pulse Output 31 Malfunction Indicator Lamp Connect To Fuel Pump Relay (position 86) Main Relay (position 86) Oxygen Sensor Heater Control Relay (position 86) 12V Ignition Switch Power motor begins cranking the engine, a tach reference signal is sent to the PCM from the CKP sensor, the PCM continues to keep the fuel pump relay energized, and the fuel pump continues to run. Inertia Switch. Like earlier Ford EEC III and EEC IV fuel injection systems, the first 15 years.of the EEC V fuel injection system employs an inertia switch, also called a “fuel pump shutoff switch.” This component offers additional protection from gasoline fires in case of a collision. The inertia ECM Figure 6. A fuel pump electrical circuit. The 2second shutoff feature on the fuel pump turns the pump off if the vehicle is in a collision and the engine stalls while the ignition switch is left in the on position. Many fuel pump circuits on Ford vehicles have an inertia switch in the circuit between the relay and the fuel pump (Figure 7). If the vehicle is in even a moderate collision, the inertia switch opens the fuel pump circuit and turns the pump off. A reset button on top of the inertia switch Turn the ignition.switch off, disconnect the jumper wire and close the data link connector unit's cover. 14. FUEL SYSTEM CHECKING 1/1, 2 & 5/13. 1 If the engine fails to start and you suspect that fuel is not reaching the injectors, you can perform a quick check to see if the pump is operating. You first need to bypass the fuel pump relay so that the pump will operate as soon as the ignition switch is turned on. Open the data link connector (marked DIAGNOSIS and mounted on the left The fuel system pressure must be relieved before disconnecting any fuel lines. Failure to do so may result in fire and/or personal injury. 1. Relieve the fuel system pressure as follows: a. Start the engine and let it idle. b. Locate and remove the fuel pump.relay from the main fuse junction panel located next to the lefthand front strut tower. c. After the engine stalls, turn OFF the ignition switch. d. Install the fuel pump relay. 2. Disconnect the battery cables, negative cable first. Remove the In a typical circuit (Figure 40.6) when the ignition switch is in the crank or run position, the computer provides a ground path to the fuel pump relay. With the relay energized, current flows to the fuel pump, which remains on when the engine is cranking or running. When the ignition is turned on and the engine is not cranked, the pump only remains on for 0.5 to 2 seconds because the fuel pump relay shuts off power to the fuel pump. This prevents flooding or engine lockup (in case of Disconnect.the airflow sensor fuel pump safety switch connector and turn on the ignition switch. Obtain fuel pump test relay from the dealer and install according to manufacturer's instructions. If all else fails in an attempt to energize the fuel pump, run a set of jumper leads from the fuel pump to the battery. Be careful about polarity between the fuel pump and battery. With the valve on the gauge in the open position and the fuel pump running but not the engine, record the control
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