My Hyundai Accent 2003 has a problem while filling fuel. It stops every 0.3 gallons. I tried to fill it manually, squeezing the pump very slowly, with no luck. The guy at Tuffy did not have any idea how to go about it and gave me the impression that this could be a tricky problem. Any suggestion is appreciated.

Failure in the Evap System

Check for Evap Codes & diagnose that system

Most likely a failed evap vent solenoid

Google : OBD PO446 thru PO449 & read up

Hi there:

There is a tank pressure vent that allows the pressure from the gas entering the tank when you are filling it, to be vented, otherwise it will kick the fuel nozzle off. That vent ties into the same system as the valve in the recall. Ask your dealer.

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You generally would smell a fuel leak. The Accent is a fuel injected vehicle, if the system were leaking, it would be at over 20-40 PSI even at idle, and a fire would be possible and you would know it.

You need to make sure your mileage is low by figuring your MPG (miles per gallon) on a regular basis. Fill up at a station on level ground, reset your trip odometer to keep track of your mileage, drive out that tankfull and go back to that same pump and fill up the same way. Stop at the first click and then do the math. The number of miles since filling up, divided by the number of gallons it took to refill it, give you an average Miles per gallon for your car.

If you compare your figure to the normal specs for your car, you'll know if you need a tune up, new tires, or just to change the old driving habits.

You can use any station with a level filling area, it's just much easier to be more accurate when you use the same station repeatedly with the same pump & setting the handle at the same speed to fill.

Good luck !

you have a "slow fill tank!" try filling it slower?

There should be an air vent coming from the top of the gas tank back to the top of the fuel tank. Possibly kinked or pinched, try pulling the fuel nozzle about half way out and filling the tank on the lowest setting the fuel pump will let you.


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it will, but only slowly,you cannot use the auto fill pumps......the filler neck has a restrictor inside to stop people syphoning gas out/leaking when turned over....so fill it slowly...

Sounds like the charcoal canister - replace it.

I have a 2005 Hyundai Accent, It is not possible to fill the tank if you are letting the petrol pump run at full speed.Trying to fill up quickly it will only build up pressure and cut off. Next time you fill up just pull the petrol pump handle half way, it will take longer to fill but you wont get the blow back. Modern petrol pumps are getting quicker all the time.Hope this helps you.

possible cause could be evap canister full of gas causing back up

The fill tube for the fuel tank is either clogged with something or the anti-siphon feature (what stops people from stealing your gas) is fouled up. The tank and fill tube have to be inspected.