Question about 1998 Chevrolet Cavalier

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I have a 98 Cavalier 2.2L that when it gets warm it shuts down. I can drive 80 miles an hour or 30 mph but after about 7-10 min in the heat it will shut down. It will take 30 seconds to start again or 5 min but then you can run it again for 7-10 min and it shuts down again. I have replaced the electronic control module and am leaning toward vapor locking???? or fuel pump? I didn't think a fuel injected car would vapor lock, I have searched and talked with a number of mechanics and they all have different answers. If it is a vapor lock has Chev Cavaliers had this problem before and what is the fix?

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Yes vapor lock problem is not possible in fuel injected car.
Although vapor lock is not often seen in modern cars, it is a common problem with the carbureted cars of past decades. Vapor lock causes a car to stop running when the fuel lines overheat; cars sitting on the side of the road with their hoods raised used to be a common sight, particularly on hot days.
Vapor locking primarily happens in cars with carbureted engines, but since electronic fuel injection replaced carburetors in the 1980s, most car owners don’t have to deal with vapor lock anymore. Carburetors and electronic fuel injection are two different methods of delivering the proper amounts of fuel to the engine. Fuel injection is more advanced, and requires a computer to tell the injectors how much gasoline to squirt into the engine. A carburetor, on the other hand, is a mechanical device that uses the engine’s natural vacuum, allowing specific amounts of fuel to be sucked into the combustion chambers. The amount of fuel that is delivered to the engine can be changed using simple mechanical adjustments on the carburetor.
When the fuel turns into vapor, the mechanical fuel pump can no longer move it along the lines. As a result, some or all of the fuel stops getting into the combustion chambers, and the car either begins to run very roughly or dies completely. If the driver attempts to restart the car, it will probably not start, or will continue having problems. This is known as vapor lock.
Vapor lock does not usually happen in fuel-injected engines for several reasons. First of all, most electric fuel pumps are located at or in the fuel tank. Because the fuel tank is usually located too far away from the engine to be affected by its heat, gasoline is not likely to turn to vapor there. As a result, the fuel pump can push the fuel along without any problems, avoiding one of the major causes of vapor lock.
Another reason why vapor lock does not often happen in fuel-injected engines is because the fuel lines are usually pressurized. The high pressure that the fuel is under prevents it from turning into vapor quite as easily, unlike the carbureted system that actually produces negative pressure, also known as vacuum, in the lines.
Get the Fuel pressure checked.The fuel system and fuel pump including fuel filter.If the fuel pressure is low or getting low after some driving then this can cause this problem.
Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Jul 13, 2010

  • dwright_35 Jul 13, 2010

    so then you are saying that you believe its the fuel pump? You are suggesting I test the fuel pressure at the time of failure or any time?

  • dwright_35 Jul 13, 2010

    So are you saying i need to check fuel pressure at time of failure or other times?



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