Check Engine Light Leads to New Fuel Pump

I had my first real mechanical issue with my 4.6 this last week.

Monday morning I started her up for my trip to work and noticed the car was vibrating heavily and the Check Engine light was on and blinking.

Shut off the motor and restarted. No more vibration and Check Engine light was off. Pulled out to the street and noticed that the car would hesitate when I gave it gas then after a half second or so would surge forward. Continued to do this at the next few stop signs.

Returned home and called Eric at Stevens Creek Hyundai in San Jose (great service department there IMO). Eric asked me to bring the car in ASAP and suggested I use the Hyundai Roadside Assistance, which I did. Tow truck showed up within 20 minutes and off to the service shop.

Drop the car off and Eric hooks with up with a rental. End of day one, service tech was able to reproduce the problem. Getting numerous unrelated error codes. Day two, Hyundai corp. suggest they replace the fuel pump, but none in stock. Day three, new pump comes in and installed. Car running normally, in fact starting to think pump may have been defective all along. Previously, my car would sputter and surge on acceleration from time to time. Now acceleration is much smoother.

Mechanical problems are a bummer, but in this case it was handled well by all parties involved.

You are indeed lucky they were able to find the problem right away. Makes you think this is not the first time Hyundai has seen this issue on the TAU.

I have a 2010 4.6 that I purchased 3/31/10, at 200 miles the check engine light came on. After 2 days at the dealer they cleared the codes and sent me on my way stating it was a Hi / Lo error in the fuel sensor.

Yesterday at 575 miles the check engine light came on again...so I took it back to the dealer and the diagnosis was bad fuel sensors. The tech stated that the fuel tank is like a saddle bag over the drive shaft and that there are fuel sensors on each side. Both times the check engine light came on I had a little less than 1/2 tank of gas. The tech believes that the system is having trouble when the fuel level is offset by the drive shaft in the tank.

New fuel sensors are on order, hopefully this will correct the problem.

Casey said:

I have a 2010 4.6 that I purchased 3/31/10, at 200 miles the check engine light came on. After 2 days at the dealer they cleared the codes and sent me on my way stating it was a Hi / Lo error in the fuel sensor.

Yesterday at 575 miles the check engine light came on again...so I took it back to the dealer and the diagnosis was bad fuel sensors. The tech stated that the fuel tank is like a saddle bag over the drive shaft and that there are fuel sensors on each side. Both times the check engine light came on I had a little less than 1/2 tank of gas. The tech believes that the system is having trouble when the fuel level is offset by the drive shaft in the tank.

New fuel sensors are on order, hopefully this will correct the problem.

Click to expand...

Huh??? "fuel level is OFFSET by the drive shaft IN THE TANK"?? "like a saddlebag over the drive shaft"?? Can't be, because the car uses only one fuel pump, and as far as I know, most fuel pumps on fuel injected cars, are located in, or extend to the bottom of the fuel tank, not one on each side of the saddlebag.

You must have understood the tech wrong. Does not sound right.

No matter, if it fixes the problem, thats all that matters.