Fuel and exhaust systems

Fuel system warnings

1. Gasoline is extremely flammable and repairing fuel system components can be dangerous. Consider your automotive repair knowledge and experience before attempting repairs which may be better suited for a professional mechanic.

) Don’t smoke or allow open flames or bare light bulbs near the work area
) Don’t work in a garage with a gas-type appliance (water heater, clothes dryer)
) Use fuel-resistant gloves. If any fuel spills on your skin, wash it off immediately with soap and water
) Clean up spills immediately
) Do not store fuel-soaked rags where they could ignite
) Prior to disconnecting any fuel line, you must relieve the fuel pressure (see Fuel pressure relief procedure)
) Wear safety glasses
) Have a proper fire extinguisher on hand

Fuel system

2. The fuel system consists of the fuel tank, electric fuel pump/fuel level sending unit (located in the fuel tank), fuel rail and fuel injectors. The fuel injection system is a multi-port system; multi-port fuel injection uses timed impulses to inject the fuel directly into the intake port of each cylinder. The Powertrain Control Module (PCM) controls the injectors. The PCM monitors various engine parameters and delivers the exact amount of fuel required into the intake ports.

3. Fuel is circulated from the in-tank fuel pump to the fuel rail through fuel lines running along the underside of the vehicle. Various sections of the fuel line are either rigid metal or nylon, or flexible fuel hose. The various sections of the fuel hose are connected either by quick-connect fittings or threaded metal fittings.

4. 2015 and later CR-V models are equipped with direct injection utilizing a mechanical high-pressure fuel pump, located on the engine. The in-tank fuel pump supplies fuel to the high-pressure fuel pump. The high-pressure fuel pump supplies the fuel pressure for the direct injection fuel injectors. The direct injection injects fuel directly into the cylinders and requires high pressure to overcome the cylinder pressure.

Electronic throttle control system

5. The Civic and CR-V use an electronically actuated throttle body; there is no direct cable link between the accelerator pedal and the throttle body. Instead, an electric actuator within the throttle body operates the throttle based on a signal it receives from the Powertrain Control Module (PCM). The accelerator pedal module provides input to the PCM of the actual position of the accelerator pedal.

Exhaust system

6. The exhaust system consists of the exhaust manifold, catalytic converter (s), muffler(s), tailpipe and all connecting pipes, flanges and clamps. The catalytic converters are an emission control device added to the exhaust system to reduce pollutants. On some models, the exhaust manifold is incorporated into the cylinder head, and the primary catalytic converter bolts directly to it.