Low fuel pressure can cause a lean condition where too much air mixes with the amount of fuel in the combustion chamber, causing the engine to run hot and melt the spark plugs. Low fuel pressure can be caused by several factors, including:

• Running the vehicle on low fuel, which can damage the fuel pump over time by causing fuel pump components to overheat or wear out.
• Fuel line leaks, leaking fuel injectors, or a defective fuel pressure regulator.
• A faulty regulator, a fuel pump malfunction, or problems with the fuel lines.
• Not enough fuel in the gas tank, which can cause the fuel pump to take in air and overheat.
• Low voltage to the pump.
• Defective fuel filters, fuel pressure regulator, or fuel lines.

If you suspect low fuel pressure is causing poor performance in your vehicle, you can use a fuel pressure tester to analyze the pressure fluctuation and determine whether the pressure is normal, low, or nonexistent. Its important to correct the problem sooner rather than later to prevent further damage to the fuel system.