Will not stay running after fuel fill?

TONYINV

MEMBER
2007 HYUNDAI SANTA FE
3.3L
V6
2WD
AUTOMATIC
200,000 MILES

The problem started 6-8 months ago. After filling it with fuel, turn it on and it surges, runs very rough then shuts off. Takes longer to start (like not getting gas) then finally starts but won't stay running unless I give it gas.

Eventually it will stay running on its own.

Recently, it's started having issues on hot days. After being parked all day, it won't stay running after start like after a fill up.

This seems like a vapor lock kind of thing.

Have already replaced the vapor canister and valve on there and the valve in the engine compartment for the fuel vapor.

No code related to vacuum.

Do have a lean on bank 1 and bank 2 code.

Any help would be appreciated.

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Hi,

If you have a lean mixture code for both banks, chances are you have an engine vacuum leak. With the engine running, open the hood and see if you notice any hissing sounds. Also, make sure the air inlet hose (between the air filter box and the throttle body) is properly connected, isn't damaged, and is tight.

If visually, everything appears to be okay, follow the directions in this link. It explains how to locate and repair a vacuum leak.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Keep in mind, this could also be related to other things, such as a weak fuel pump or a partially plugged fuel filter. However, most times it is a vacuum leak.

Let me know what you find. Also, let me know the exact codes you are getting and if there is anything other you notice to be odd.

Take care,

Joe