Faulty Fuel Pump: one of the reasons that most likely will cause stalling on hot days. And the risk of vapor lock—especially in older cars—increases as temperatures rise. Vapor lock happens when fuel evaporates in the gas lines, making it so that fuel can't get to the engine. Automobile experts say this can occur in ambient temperatures of excess 90 degrees Fahrenheit, especially when the vehicle has been parked in direct sunlight for any significant amount of time.
For most vehicles the ideal pressure ik 40-60 psi that a good working fuel pump should keep. If the fuel pump is starting to go out, it may not be able to provide the proper amount of fuel pressure and the engine will stall. The weakness of the fuel pump can contribute to a loss of up to 20% fuel delivery which only makes things worse during hot days. Nearly 10% of vehicles sold each year will stall at some point, according to a report released by the National Highway Traffic Safety Administration (NHTSA) fuel pump is responsible for somewhere around 10% of all vehicle stalls.
The electrical parts of the fuel pump can also be affected by high temperatures. When the temperature goes up, it increases the electrical resistance and can cause pump failures or place on and off intermittently. Mark Richards, an automotive technician with more than 30 years of experience says “Heat can destroy fuel pump components–meaning the summer months are a good time to check for optimal performance.
Besides that, the fuel itself is largely to blame for engine performance on hot days. Fuel that is of a lower quality could have higher tendency to vaporize when under heat, and hence the stall. The American Petroleum Institute recently released a study showing that fuel with a higher volatility rating can accelerate performance once it gets hot out. Accordingly, a quality of fuel additionally helps to evaporates fewer due stalling since it is generated less vapor form it.
Drivers whose vehicles are stalling should also look at the rest of the car. Fuel filters that are clogged will restrict flow, adding to the difficulty of getting enough fuel through the pump, especially at higher temperatures. Chaning the fuel filter every 30,000 milesChanges..fuel
In addition to these new diagnostic tests, you may also want to check any symptoms for the fuel pump that would crop up when stalling on hot days (like hard starting or sputtering, as well as sudden loss of power). If it occurs alongside hot weather, you should investigate the fuel pump to see if is doing its job. So there you have it, a bad Fuel Pump can simply add to the situation that causes stalling in hotter weather. A key to keeping your summer rides cool and reliable is knowing how temperature, fuel delivery, and engine performance interact.