Question about 2000 Hyundai Accent
It sounds like the fuel pump is getting a bit weak, and when you remove the filler cap, this relieves pressure within the fuel tank. A good local mechanic should be able to quickly test the fuel pressure generated by the fuel pump. Many auto parts stores sell a fuel pump pressure tester. But working with fuel lines and raw fuel isn't a good idea unless you know what you are doing. It could be the fuel pressure regulator valve, but this is less likely.
Possibly your engine could have a serious vacuum leak somewhere on its intake side of the engine, but you would have other symptoms aside from the specific symptom of having difficulty starting the car after filling the car up with gas.
It occurs to me that the following test might indicate a failing fuel pump:
After driving for a while (at least 10 minutes), turn off the car, then take the gas cap off to relieve tank pressure, put the cap back on, and then see if you have difficulty starting the car. If you do, then a failing fuel pump is the problem. Well, at least if this test confirms the problem, its better than suddenly being stranded when the fuel pump does completely give up the ghost! :-)
Posted on Apr 27, 2009
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