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2004 Hyundai Elantra Hyandai Fuel delivery issue

Tiny
SINGLET
  • MEMBER
  • 2004 HYUNDAI ELANTRA
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
After replacing the fuel pump/assembly on a 2004 Hyundai ELANTRA it still seems fueled starved after sitting over night. I also replaced the Fuel Damper Assembly, cleaned fuel injectors and put new o-rings on injectors.
Wednesday, August 20th, 2014 AT 5:50 PM

9 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,170 POSTS
What is the vehicle doing? Did you replace the fuel filter? Is the pressure to the engine within the manufacturer's specs?
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Wednesday, August 20th, 2014 AT 6:01 PM
Tiny
SINGLET
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  • 6 POSTS
It still seems fueled starved after sitting over night. The fuel filter is part of the pump assembly I replaced. I have not had a pressure reading done.
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Wednesday, August 20th, 2014 AT 6:29 PM
Tiny
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I assumed the pressure would be good after the pump and all were replaced.
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Wednesday, August 20th, 2014 AT 6:34 PM
Tiny
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  • MECHANIC
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If it seems to happen after sitting overnight, that leads me to believe the pressure is dropping off and it is taking the pump time to get things built back up.

Try this in the AM. Cycle the key from of to on 3 times. Each time, wait about 3 seconds before returning to the off position. On the 3rd time, start the engine. Is there any difference?

Also, here is a video for checking fuel pump pressure, the pressure regulator, and drop off. Let me know if it helps.

https://www.2carpros.com/articles/fuel-pump-pressure-and-regulator-test-video-all-cars
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Thursday, August 21st, 2014 AT 4:46 PM
Tiny
SINGLET
  • MEMBER
  • 6 POSTS
That is what I have been doing each morning. It eventually starts after listening to the fuel pump cycle over and over in the morning. Then it starts and will continue to start the rest of the day until left over night.
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Thursday, August 21st, 2014 AT 8:43 PM
Tiny
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I did the Cycle the key from of to on 3 times. Each time, wait about 3 seconds before returning to the off position. On the 3rd time, start the engine.

Then it started. Any idea on why this is happening?
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Friday, August 22nd, 2014 AT 2:54 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,170 POSTS
Okay, if that helped it start, then there is something allowing fuel pump pressure to drop. I need you to check fuel pump pressure and then see how quickly the pressure drops off when you turn the key off.

If it drops quickly, you could have a leaking injector, a leak in the fuel system. I forgot to ask, but is the check engine light on?
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Friday, August 22nd, 2014 AT 7:52 PM
Tiny
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No "Check Engine" light.
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Friday, August 22nd, 2014 AT 8:46 PM
Tiny
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Okay, that tells me that it isn't an issue with a sensor. Let me know what you find with fuel pressure drop off.
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Sunday, August 24th, 2014 AT 8:57 PM

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