The evos sytem on chevys is the problem,,,evap operating system,,,evos,,, the vent valve soliniod, or vent valve purge,,on the intake of the engine is sticking in the open position,, i cant remember which its called but its the one on the intake,,, what happens is it sticks open position and when you fill your car with gas it pushes all the gas fumes into the intake,,, causeing a flooding ,no start , or hard start situation,,,if you cant or dont want to fix,it, you can leave your car running when getting gas it will be fine ,,which is the cheap fix,,,, the evos system has 4 componets,,, vent valve solinoid, vent valve purge, charcole canister, fuel presure sensor(top of fuel tank) all can be replaced for around 125 bucks if you do some seaching around and doing the labor yourself,,check out you tube,,,
RepairPal Expert Overview:
The RTV seal on the fuel system control modules may allow water
to enter into the module. Water in the module can cause a short, which
may cause hard starting, a crank-no start condition,
or stalling, and the Service Engine Soon light may come on. If the
engine stalls unexpectedly, there is an increased risk of a crash.
Dealers will replace the fuel system control module free of charge. The
recall began on May 18, 2009. The GM recall number is 08411.
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