Fuel pressure tests are best done every 30,000 miles or any time one notices problems in the fuel system, such as poor startups, sluggish accelerations, or poor fuel economy. This will ensure that the proper pressure-usually between 40 to 60 PSI for most fuel-injected vehicles-is provided by the Fuel Pump to the engine. Early detection of problems will be possible in this way-an almost dying Fuel Pump, a clogged fuel filter-once these have been given appropriate repairs to save oneself from costly repairs in the near future.
For high-performance vehicles or with modified engines, it is worth checking fuel pressure frequently, especially when major engine modifications are made. A high-flow Fuel Pump-such as Walbro 450 LPH-may need different fuel pressures to support increased horsepower-and making sure proper pressure is maintained for optimum air-fuel ratios. A low fuel pressure can make the engine run lean; the risk of overheating can further cause damage to the internal components. On the other hand, if the fuel pressure is too high, it will make the engine run rich, which further causes inadequate combustion and poor fuel economy.
In 2019, Ford recalled over 1.2 million vehicles due to low fuel pressure caused by faulty fuel pumps. Owners reported frequent stalling and loss of power. It showed how vital constant fuel pressure is to vehicle reliability. By checking the fuel pressure of your vehicle, you can avoid such issues in performance and give the fuel pump a chance to operate within its designed specifications.
According to David Vizard, a specialist in car-related matters, "the closest monitoring of fuel pressure is the surest way to extend engine life, especially high-performance ones." Ensuring that the fuel pressure remains constant will enable the engine to operate smoothly and efficiently without causing any hazard.
For more detailed information on how to maintain optimal fuel pressure and how to test your Fuel Pump, refer to Fuel Pump.