Question about Hyundai Motor 2002 Sonata

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When I take gas cap off all kinds of air comes rushing out and when I go too put fuel in it, it does not want to go in the tank,,,its acting like the tank if full and its not....any ideas?

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Hello! the Vapor Canister Purge Valve is defective...Cost is around $30...Dorman part # 911803...It is located next to the charcoal canister...See picture below...Guru...saailer

When I take gas cap off all kinds of air comes - saailer_66.jpg

I’m happy to help further over the phone at

Posted on Jan 04, 2011


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The fact that no fuel gets through or it's intermittent tends to suggest a problem with the fuel line itself. Is it rubber? It may have collapsed /perished internally.

You may have a blockage at the fuel pick up point within the tank itself. I think this is probably the most likely .. something 'drifting' around the bottom of the tank and acting like a shut off valve..

If your tank is developing a vacuum it will cause problems. There should be a vent from the tank to atmosphere - either a thin breather tube or a flap in the fuel cap. If the breather becomes blocked a vacuum is caused in the tank - it 'holds up' the fuel.

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Hi: Try changing the fuel filter, Also check the gas tank vent, when it stalls loosen the gas cap and try to start it again it may not be lack of fuel but when you open the cap you are reliving the vacuum from the tank, after you close the cap the vacuum will build again.It can also be the gas cap if it is vented. Good Luck /AL

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What size is the new line in comparison to the old one that went bad?? If the line is too narrow in diameter, it will not allow the air to rush out when you put fuel in it. The intention of that particular line is a 'breather' for the gas tank. Try a larger size line.

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Two things come to mind. You broke the pressure seal to the fuel system when you took off the gas cap. The fresh gas rushing in disturbs any dirt or debris on the bottom of the tank.
Next time you use the car when you arrive at our destination, simulate what you do when you fuel up. This will mimic everythig except the new fuel rushing in. If it is still hard to start you know it's something to do with the evaporative fuel system. If not, you need the fuel tank inspected .

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If it's of any use to you, I've put some photos of the fuel pumps and fuel filter on my own website - Just choose 'Volvo 960' from the drop-down menu.

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