Question about Hyundai Motor 2004 Sonata

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Hard to start after fill up.

I have a 2004 Sonata and every time we get gas the car has trouble starting.Could this problem be related to the fuel pump or filter?

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It is probably the evap purge valve

Posted on Dec 10, 2009

  • smbbowlerii Jul 11, 2011

    im having the same problem, i changed the fuel pump, and the battery, and im still having the same problem, your saying the evap perge valve, where is that located?

  • river_rat422 Jul 12, 2011

    Sorry, can't tell you where it is on a Sonata. By the way, Evap Purge Valve is what it is called on a V.W not sure it is the same for a Sonata. Suggest you try a model specific forum or if you have a dealer near by go to parts department they will usually show you. Another option is go to an autoparts store and look at a Chiltons manual.

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It could be the filter. They can get clogged sometimes. Its a cheap fix and easy to do. If this does not solve the problem try filling up at a different gas station. I had the same problem with shell gasoline. Hope this helps

Posted on Oct 01, 2009

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I know the answer to this problem. It is the "Purge Control Valve". I believe its on the back of the engine but am not 100% sure yet. I am about to correct this problem myself as soon as I find the **** thing. As for price, the dealer quoted me 130.00 but I bought one off ebay for 35 shipping included. The same part also fits Kias. Hope this helps

Posted on Sep 13, 2011

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Posted on Jan 02, 2017

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1 Answer

When tank is below 1/2 full the car is hard to start and when driving it seems to lose power. My check engine light does not come on.


the problem maybe a problem with fuel pickup at 1/2 tank, if the line has blockage, the filter is clocked up, the leveling or device that keeps track of fuel level is defective, there issue with the floater, the part that suppose to float has or full of fuel and when it gets to 1/2 tank, the floater full of fuel and sinks like your out of gas.
i think most likely clogged fuel filter in the fuel tank if your car has this type of system.
if not the fuel filter most of the time its near intake of the injectors, underneath the drivers seat under the car.
or by the inlet and outlet of the fuel tank.

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Filling up the gas tank can stir up the fuel fumes. You may need to check your evap system? I can't rule out bad gas?
When the problem is ongoing, have a helper crank it while you check for spark at the plugs. If spark everywhere, use a gage and check proper fuel pressure and fuel injector pulse. With intermittent issues, need to test when problem is ongoing. How long since a tune-up? Any applicable trouble codes?
Problems at higher rpms, the basics, you check for a blockage of some kind, fuel--air--exhaust.

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After filling up my 2004 Hyundai Sonata, it has trouble starting. It takes 3 or 4 attempts then it will start, shake a bit, then run fine. Any ideas or suggestions would be appreciated.


Try some dry gas, there maybe water in the tank or crud being kicked up,

Next time fill it up when it gets to a 1/2 tank to test..

if the problem remains it could be a evap or pressure problem..

How old is the fuel filter?

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