OEM and aftermarket differ by usually meeting quality, fit, and price. OEM fuel pumps are made to meet the exacting specifications of the original vehicle manufacturer. They have been designed to deliver fuel at precise pressures, typically between 40-60 psi for most fuel-injected systems, which ensures consistent performance across the engine. OEM parts generally are sold with a 12-24 month warranty, ensuring reliability and lifetime up to 100,000 miles under normal driving conditions.
On the other hand, aftermarket fuel pumps are supplied by third-party makers. Although some models of aftermarket pumps boast equal or near-equal quality to OEM parts, more often they differ in design and construction. Compared with the OEM pumps, although 20-30% cheaper, the possible differences may be greater wear-out or minor features in fitting. In some cases, aftermarket pumps are not subjected to the same stringent testing criteria, which, in due course of time, can lead to inconsistent fuel pressure or reduced economy.
OEM pumps are designed with just the specifications of your car's fuel system in mind and, therefore, are easier to install. Because of this exact fit, most complications will be at a minimum, whereas one might have to make slight modifications or adjustments for an after-market pump. For high-performance applications, though, owners often prefer specialized aftermarket pumps that are rated for higher pressures or fuel demands than those specified by the OEM, such as in the case of turbocharged and supercharged engines.
As Carroll Shelby once said, an automotive authority, "Quality is not an act; it is a habit." The same thing relates to the fuel system components where a quality Fuel Pump can make quite some difference in the reliability and performance of any vehicle. OEM fuel pumps are a good option for daily drivers looking for durability and ease of installation, while good-quality cost-effective aftermarket options can meet performance needs of those who need to balance budget with performance.