Weak Fuel Pump Causes Misfires? No, A Bad Fuel Pump Can Cause Engine Misfires Most modern vehicles operate at a fuel pressure of between about 40 to 55 PSI, and the primary job of the fuel pump is deliver fuel from its tank to the engine at that precise pressure. If the pump is weak and doesn't keep this pressure, the engine gets too little fuel and thereby it will be difficult to achieve a balance in the air-fuel mixture, which will result in misfires.
They can happen when one or more of the engine's cylinders do not properly ignite the air-fuel mixture. This may occur randomly or across all conditions if the pump is severely under-performing. If the pump is only making 10% less pressure than necessary, while accelerating or cruising at higher speeds, you will hear the engine struggling - and can be easily misfired (or allready is under load).
This can also disturb the timing as to associated with a weak fuel pump. This is important as modern engines use an electronic fuel injection system where the critical aspect for good engine performance lies in correct amount of delivered fuel. Low Fuel Pressure — A dying pump will be unable to deliver enough fuel, so the engine may hesitate or misfire. Fuel system failures, including fuel pump issues account for 7% of misfires that are due to engine-related problems in vehicles (AAA)
The risks of fuel pump failures were underscored that same year by a recall covering several Ford models. Ford replaced weak fuel pumps in these cases, which might cause engine misfiring and engine stalls to avoid potential safety hazards for drivers. The incident is an illustrative example of how important the operation characteristics of a fuel pump are for the health of an engine.
Replacing a fuel pump before it instructs further damage to the working of an engine will keep repair costs 50% lower. Weak Misfires triggered by a failing pump can also damage the catalytic converter & spark plugs as well, significantly raising repair costs.
Or, as automotive expert EricTheCarGuy said, 'your engine is only as good as the fuel it gets. This also illustrates the need for a fuel pump that performs as expected, to help make the engine run well and prevent misfires.
However, misfires can develop if the fuel pump is weak and not delivering the correct amount of fuel to your engine which is why it is important to catch issues early. Visit Fuel Pump for quality replacements that will have you back on the road in no time, and avoid more expensive engine repairs.