A no-start condition that is caused by the fuel pump being unable to breath properly, will require a fuel pressure diagnosis. A normal fuel pump has pressure of 40-60 PSI, if this falls lower, the engine will miss getting enough fuel to start. Faulty fuel pump can be checked using a fuel pressure gauge (Cost $30 to $50 ) and also it may give enough indicationsetermining if the fuel is delivering at correct pressure. If pressure is significantly low, The pump could be failing or clogged and not allowing the car to start.
Another short diagnostic step is to listen for the operation of the fuel pump. The fuel pump should make a low humming noise when the ignition is turned to ON. No sound: This will probably mean it is an issue related to electrical or the fuel pump circuit. A relatively cheap part in the form of a broken fuel pump relay or blown fuse, which can cost between $10 to $20 each, could make it impossible for power to reach the pump causing a no-start condition. Replacing these parts is pretty cheap compared to replacing your fuel pump (which can range from $200-$500 depending on the vehicle).
Electric faults may also result in a pump failure. Fuel pumps work on a 12 v system and any drop in voltage would not only make it happen but worse supplying the fuel needed. Comforting this is the compromise of checking that the pump gets a proper voltage the use of a multimeter. If the voltage is less than 12 volts, it may flag a wiring issue or that the battery is losing its charge. A 2-volt drop can cause the pump to be up to 15% less effective, which will prevent it from starting.
Another possible problem that can lead to fuel pump failure is fuel contamination. The pump's filter can trap dirt or debris, preventing fuel from flowing. The long-term presence of contaminants may decrease the pump's useful life by as much as 50,000 miles (from 150,000 to 100,000 miles), resulting in a potential premature failure. If bad fuel is suspected, the fuel tank may need to be emptied and the filters replaced (typically costing $50-$150).
A more elaborate diagnosis entails examination of the fuel system return line for any obstructions. When the fuel is not making it back to the tank as it should, this might be due a problem with the fuel pressure regulator, or perhaps even a clogged return line. All are issues that prevent the pump from sending gas where it needs to go. A problem such as this can lower fuel pressure by 20% and that is enough to cause no-start. Blockages can be dissolved or the regulator can be replaced.
Thousands of no-start conditions can be directly attributed to a single 2020 recall involving over 150,000 vehicles with bad fuel pumps. It served as an example for the necessity of routine maintenance and early diagnosis of fuel pump problems, especially on high-mileage cars. Following this guide, being able to diagnose fuel pump issues sooner rather than later will save you some money and ensure that your car remains reliable.
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