Common Symptoms and Causes of Nissan Fuel Pump Failure
If your Nissan fuel pump is not delivering enough fuel pressure and volume to the engine, you will have a hard time starting or running the vehicle properly. When the fuel pump goes bad, you have two scenarios: low fuel pressure or no fuel pressure at all. Both will either leave you stalled in the middle of the road or unable to leave the garage at all. There are other problems that could arise from a bad fuel pump. The good news is that it's not that hard to troubleshoot. Below are some tips that might be of help to you:
The engine cranks but will not start.
A dead fuel pump can prevent the engine from starting. However, this can also be a result of a problem in the ignition system or a broken engine part like the timing belt. If there is no problem with either the engine or the ignition system, then it's really your Nissan fuel pump. You could confirm this by first checking the spark. Do this by connecting a spark plug tester while the engine is cranking. You should be able to see a series of sparks if the ignition is fine. Check the engine for any damaged parts or if the timing belt is broken. If everything in the engine and ignition system is fine, then a lack of fuel is what you might be dealing with. When the engine is cranking, you should hear the fuel pump making noise -- which means it is working fine.
The engine sputters at high speed.
One of the early signs of a fuel pump problem will come when you are driving your vehicle at a constant high speed. Your vehicle will run well for a certain miles and then begin to jerk and sputter for a mile or two; and then return to normal. Most people are misdiagnosing this as a problem with “dirty” gas or some fuel-related issue. In some cases, that would be the correct assumption. However, a fatigued Nissan fuel pump can also be the culprit. This happens when the fuel pump struggles to supply a constant stream of fuel to the engine with the right pressure. Loss of pressure will cause the engine to sputter.
The vehicle loses power while accelerating.
This symptom is almost the same as engine sputtering except you will experience it when accelerating from a stop. Initially, your vehicle will move before making noises and starting to jerk around as if it is going to stall. It will eventually continue to accelerate smoothly. What happens here is that there is an increased in demand for fuel by the engine as the vehicle accelerates. But, with the fuel pump malfunctioning, it cannot maintain the right amount of pressure required to deliver the fuel in a steady manner. This will result to the engine having improperly mixed fuel and air; thereby, losing power.
There is sudden loss of power.
When you are traversing uphill roads or hauling a lot of loads in your vehicle, it's causing a lot of stress to the vehicle. When you encounter sudden loss of power while completing these tasks, you will need to check the fuel pump. In general, the fuel pump (even an old one) should be able to maintain a steady stream of fuel and pressure when operating. But, if the pump is damaged, it will be unable to keep up with the demands of even normal operations, leading to power loss.