Buy a new controllable fuel pump because if it fails to control your fuel delivery, then high fuel consumption can also be caused by the failure of a pump. A pump that does not properly function may over-supply or under-supply fuel, throwing off the critical fuel-to-air ratio on which many modern engines depend for optimal efficiency. In the case of gasoline engines, this is typically a ratio of 14.7:1, and if it gets out of whack, you essentially end up wasting fuel instead of burning it.
Diagnosis of an automotive often relates a faulty fuel pump with an increase in fuel consumption. One example is a 2023 American Automobile Association (AAA) study showed that cars with faulty pumps had up to 15% to 20% lower fuel efficiency. When that happens, the fuel pressure is irregular and usually pushes the engine control unit (ECU) to overcompensate with rich burn cycles.
Ford had a nearly250,000-truck recall in 2019 where it pointed to the fuel pump as one possible reason for more than normal fuel consumption. Motorists said they were refuelling more frequently and some linked an extra $30 in weekly petrol costs. Analyses conducted over a period of time by Ford confirmed inconsistent pump operation as the issue.
This brings me to the concept of “fuel trim.” Under normal conditions, the ECU trims fuel injection using information from the lambda probes and from pump output. This feedback loop is disrupted when one of the pumps fails, resulting in “rich” conditions in which unregulated fuel altogether floods the engine. Automotive gurus such as Chris Fix also caution that “rich running not only costs fuel, but can damage components like catalytic converters.”
A gauge can determine the fuel pump’s pressure and verify that such problems exist. A functioning pump will provide consistent pressure as specified by the manufacturer while a bad pump demonstrates erratic movement. The cost of replacing the pump runs somewhere between $400 and $800, but not fixing this issue could cause damage to other parts leading to a pricier repair: oxygen sensors typically cost an average of $250 each.
It is also important to replace a failing Fuel Pump as soon as possible to ensure the best-fuel economy and avoid expensive repairs. Fule pump- more trustworthy replacemants