If your fuel pump is supplying too much fuel to the engine, your performance can end up causing a variety of issues that affect how long your vehicle lasts and how efficient it is. Poor fuel economy is a common symptom of a failing fuel pump. The delivery of too much fuel results in a rich fuel mixture, in which there is going to be more fuel than needed when it comes to the air to fuel ratio. In turn, this imbalance leads to the engine running overly rich, increasing fuel consumption. Vehicle should get a 10-15 percent drop in fuel economy thanks to the overfueling problem, according to Car and Driver reports.
Black Smoke From The ExhaustAnother sign of fuel being delivered excessively is black smoke from its exhaust. This is because the additional fuel cannot all burn and it sloughs out as dark, sooty smoke. GM says something that comes up frequently is black exhaust flecks, especially during acceleration which suggests a rich fuel mixture, which is essentially a bad fuel pump delivering too much fuel.
It may also make it hard to start an engine or cause it to idle rough. If the fuel pump is providing too much fuel, spark plugs can be flooded and fail to ignite properly. It can in turn cause the spark plugs to get fouled and misfire over time. Toyota Motor Corp said these problems get worse with a defective regulator or a malfunctioning pump in system. Data from Automotive Repair Solutions found that over 30 percent of the fuel system failures were traced to problems with fuel delivery, many of which were caused by fuel pumps working overtime.
Multiple Issues: Some might cause the check engine light to go on on the dashboard. The OBD-II system integrated into today’s vehicles alerts the driver with an error code when air-fuel ratios are misaligned, which indicates that the engine is taking in too much fuel. Codes such as P0172 (System Too Rich — Bank 1) and P0175 (System Too Rich — Bank 2) are commonly associated with fuel pump problems, which indicate that there’s too much fuel.
A too-rich mixture will lead to engine misfires and stalling as well. In such cases the fuel pump deluge the engine flow with excess pressure, flooding the engine with fuel. This leads to partial combustion and can cause the engine to stall. Ford Motor Company discovered that vehicles with fuel system pressure above specified levels tend to stall, particularly following deceleration or at low engine load.
If you think that your fuel pump is over-sender, it is recommended to check the fuel pressure regulator and look for my fuelest leak. Most cars have a normal fuel pump pressure range of 35–45 PSI (pounds per square inch). If the pressure is outside of this range, it is a dead giveaway that the fuel pump is bad and should be replaced.
Using quality parts and consistent maintenance is vital to keep your fuel pump burning within the desired parameters while maintaining optimal fuel economy. Read on to learn about high-quality fuel pumps made to improve fuel delivery at Fuel Pump.