The fuel system in your Honda Engine consists of many working parts. Each part is designed to work in sync with your car's entire fuel system to deliver optimum fuel flow to the engine, and sustain the normal operation of your vehicle's idling, acceleration, and speed. While a bad fuel system could cost you money at the pump, it is recommended to diagnose malfunctioning components early to avoid more expensive repairs later.
Here are the top five symptoms of a bad fuel system in Honda engine, and other important information you need to know about your Honda Accord's or Civic's fuel system.
Component Breakdown
If the check engine light is flashing and your car is idling rough or stalls, the culprit is most likely a bad fuel system. Clean or replace the dirty fuel injectors, and check the fuel line pressure using a fuel pressure gauge. Visit a local mechanic to have the fuel pressure regulator replaced if it's operating without sufficient pressure.
Poor fuel economy can be exacerbated by a loose gas cap, clogged fuel filters and fuel lines, or clogged injectors. Check for trouble codes in your car to diagnose a faulty fuel system. You may not always experience a rough idle, but poor fuel economy is a sign of a bad fuel system, which could trigger a misfire.
Engine hesitation as well as engine surges are the result of either a weak and inconsistent fuel flow to engine (caused by a clogged fuel filter), or faulty spark plug wires. While you are most likely to notice engine hesitation when you're accelerating, engine surging can occur intermittently.
Problems With the Idle Speed
Idle speed—whether slow, rough, low, fast, or irregular—point to a number of possible problems. These include dirty fuel injectors, faulty spark plugs, or an electrical problem with the engine control system. Check for trouble codes, and replace worn or clogged components as part of your regularly scheduled maintenance.
Issues With the Main Relay
Symptoms of a bad main relay include:
- You will have no-start issues.
- A lack of sound in the fuel pump when engine starts.
- Overheating that will prevent the car from starting in high temperatures.
- Disconnect the battery and replace the main relay using a ratchet or wrench.
A Bad Fuel Pump Check Valve
If your car has a bad fuel pump check valve, the biggest issues you'll notice are your car will run poorly, stall, or it won't start at all. Replace the fuel pump check valve with one that meets the specifications of your vehicle. You will need to refer to the owner's manual.
Make sure to follow your regular maintenance schedule.
- Have your spark plugs changed every one to two years for copper, and every three years for iridium.
- Have your fuel filters changed at least every two years.
- Replace the injector O-rings and seals at the first sign of damage or leaks.