What pressure are fuel pump seals normally rated to withstand?

Fuel pump seals are typically rated to withstand a pressure of 10 psi. This rating ensures that the seals can adequately handle the operational pressures within fuel systems without leaking or failing. A 10 psi rating strikes a balance between providing enough resistance to maintain system integrity and allowing for the necessary fuel flow crucial for the proper functioning of engines that rely on these pumps.

In many fuel systems, pressures can fluctuate, and seals need to be robust enough to handle these variations. If seals were rated lower, such as at 5 psi, they would be insufficient for most fuel applications, which often exceed that pressure during operation. On the other hand, while options like 15 psi and 20 psi may also be permissible under certain conditions, they are generally not the standard rating found in typical fuel systems, which is why 10 psi is recognized as the norm for ensuring reliability and safety in various applications.