Yes; a bum fuel pump can make an engine run rough (for reasons that should be obvious: if the motor ain't gettin' its gas, it ain't gonna feel so good). In order to keep the air/fuel mixture well controlled for consistent operation, most gasoline engines require fuel pressure in between 35 and 65 PSI. If the fuel pump does not produce these pressures, too much or not enough pressure is supplied to the engine causing poor idle and performance.results from a mixture that combusts either greater than normal loads, resulting in erratic driveability but mostly worsened flameout.
A pump that is struggling to deliver fuel flow, especially during acceleration or high-load conditions often results in rough running. For example, in high-performance applications where the fuel demand could be increased by 20% or even 30%, an engine-pump malfunction would cause lean conditions and result into misfires and knock. A decrease of just 10% in fuel pressure, as [fuel system] specialist Bosch notes with respect to its own products for instance, can turn over an engine that stumbles and sputters (or won't even start) sickly idle accompanies a pronounced drop in fuel mileage.
A factor that compounds the issue is a plugged fuel filter, since it will inhibit fuel flowing freely this making the Fuel Pump function harder in order to keep pressure. This increased load can prematurely wear the pump, shortening its life-cycle and effectiveness. It is suggested to replace the fuel filter around every 30,000 miles as a way to keep a consistent flow of fuel. Auto expert Scotty Kilmer states that, "If the fuel filter gets clogged up over time and you ignore it- why replacing a bad fuel pump can lead to bigger problems down the road-- A blocked flow valve makes your big pump work double," emphasizing how keeping on top of things with changes is essential.
Minor Fuel: Pump fuel too low affects the performance of free flowing in-tank pump, especially because it gets cooled and lubricated as part of its function. Operating the tank close to empty is probably graceful on the pump but could make it overheat and cause intermittent operation. Keeping fuel above a quarter tank discourages this by keeping the pressure variable more stabilized and will help an engine run smooth when it is already running choppy.
Fuel pump erratic operation can be due to voltage problems as well. A fuel pump needs a steady 12 volts of power to function properly. In both cases, the pump might deliver uneven pressure through your injectors if voltage sags—caused by dead batteries or wiring faults—for lack of power to jerk back engine smoothness. This is particularly prevalent in older vehicles where electrical parts are less dependable. If the circuit voltage is stable and connections are in good condition, then we can expect proper fuel pump operation which will support smooth idling.
In a nutshell, A failed fuel pump will interrupt the vital flow and pressure of (fuel) required for normal engine operation. Regular maintenance such as changing filters, ensuring you three-quarters of a tank and having voltage is key in the smooth running department — but also crucial for fuel pump health. These steps maintain constant operation, economy and long-term engine reliability.