The engine can shake even because of a weak fuel pump, as in this case the required exact mixture of air and fuel will not be obtained with air, and incomplete combustion or stirring due to too much change is harmful for you power plant- The fuel pump in many cases is designed to deliver a constant 40 to 60 psi and that is what the engine requires. A lean air-fuel mixture, which occurs when the pump is weak and insufficiently delivers fuel under pressure to the engine, may cause missing or stalling and thus ultimately result in your engine shaking his head.
It starts shaking simply because the engine depends on a relationship with just enough air and fuel in order to complete combustion. If the fuel pump is unable to provide sufficient fuel then combustion is uneven leading to one or more cylinders misfiring. According to data by AAA, fuel system issues lead to 5% or more engine performance complaints caused by engine misfires. Carbon build-up can lead to misfires which can cause slight vibrations or shakes during acceleration or at idle.
A perfect illustration of this problem in the real world is Ford's recall from 2018 that was received by more than 50,000 vehicles. The recall was initiated because of defective fuel pumps that would not produce enough fuel pressure, which in turn led to stalling and violent shaking of the engines. Thus, this incident is a perfect case study illustrating how deformed fuel pump could cause the disturbed working of engine.
A failing fuel pump can also lead to the engine working harder to make up for lost fuel, putting strain on things like injectors and ignition. Eventually, this extra work can further diminish fuel delivery performance compounding the problem. If an injector does not get enough fuel, the injector may clog or be damaged over time which is going to make shakes and misfires worse.
Automotive expert Scotty Kilmer says, “If your engine is shaking and misfiring, one of the things to check first is fuel delivery. A failing fuel pump can disrupt the combustion balance causing vibrations at power and higher speeds more obvious. One can avoid some of the long-term damages to the engine, and reduce in an engine shaking by simply checking regularly the fuel pressure.
Also, a weak fuel pump causes poor gas mileage as well. Because the engine is not able to produce its full power, a car that has low fuel pressure ends up consuming more gas than it would otherwise use. According to a Consumer Reports article, this inefficiency could amount up to 15-20% more fuel consumption due to the fact that your engine isn't running at its peak performance level.
Therefore, in the end, engine shaking can be directly linked to a faulty fuel pump that creates an imbalance in air and fuel ratio required for combustion. These early signs of fuel pump troubles need to treated so that no long-term damage is done to the engine and it gets back to performing well. Visit Fuel Pump to learn more about fuel pumps and solutions