Rough engine after adding fuel

schaffer79 · 11-12-2012, 04:25 PM

I own a 2007 Hyundai santa fe. Whenever I add fuel to the gas tank, be it 5gal-10gal or filled the engine will run real rough for 3-4 minutes after doing so. All other times the engine runs fine. This only happins when I add fuel to the tank. Has anyone experenced this problem or heard of this OR does anyone have an idea as to the cause? HELP. Bob

someguy · 11-12-2012, 06:23 PM

Hey Bob welcome to the forum. Has your vehicle always done this or is it a recent issue? Also what about the gas you are buying? Does it always come from the same station? If so you may want to try a different one.

sbr711 · 11-12-2012, 06:28 PM

Replace the purge control valve... you do not state though, but I will assume it is a 2.7L engine we playing with..

During refeuling, displaced air from tank is vented out through canister, the charcol bed traps the vapors, then when started, the uncontrolled vacuum leak draws through the vapored charcol in uncontrolled fashion, hence the rough run till the vapors drawn off and leak now drawing fresh air.

santa06 · 11-12-2012, 08:55 PM

Really nice explanation of what happens when this valve isn't working right.

Have replaced several over the years with a code and symtoms described; wasn't really sure of the physics of it.

11-12-2012, 04:25 PM	#1 (permalink)
schaffer79 Junior Member Join Date: Nov 2012 Location: Seneca, SC drives santa fe Posts: 1	Rough engine after adding fuel I own a 2007 Hyundai santa fe. Whenever I add fuel to the gas tank, be it 5gal-10gal or filled the engine will run real rough for 3-4 minutes after doing so. All other times the engine runs fine. This only happins when I add fuel to the tank. Has anyone experenced this problem or heard of this OR does anyone have an idea as to the cause? HELP. Bob Last edited by pare_john; 11-12-2012 at 06:05 PM. Reason: Font size too big

11-12-2012, 06:28 PM	#3 (permalink)
sbr711 Senior Member Join Date: Apr 2010 Location: hiding from those who might be looking for me 373,300+ mile (2-16-13)daily drive that holding 30+ to 33 mpg with summer blend fuel Posts: 6,624	Replace the purge control valve... you do not state though, but I will assume it is a 2.7L engine we playing with.. During refeuling, displaced air from tank is vented out through canister, the charcol bed traps the vapors, then when started, the uncontrolled vacuum leak draws through the vapored charcol in uncontrolled fashion, hence the rough run till the vapors drawn off and leak now drawing fresh air. __________________ <--- please fill in the 'location' and 'what you drive' boxes on your personal profile page. This information makes it much easier for other members to answer/comment on your posts.

11-12-2012, 08:55 PM	#4 (permalink)
santa06 Senior Member Join Date: Nov 2010 Location: Newmarket,Ontario,Canada owns 2007 Elantra-- 2006 Santa Fe 3.5 GLS son has 2005 Elantra hatch Posts: 756	Really nice explanation of what happens when this valve isn't working right. Have replaced several over the years with a code and symtoms described; wasn't really sure of the physics of it.

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