Question about Hyundai Motor 2002 Sonata

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I am working on a 2002 Hyundai Sonata with 2.4L engine. Problem is that the fuel pressure drops to zero as soon as the pump shuts off, thereby causing extended crank time after car has been sitting. There has been 2 fuel pumps, a pressure regulator and the fuel filter replaced.The fuel filter is aftermarket. Did the OE filter have the check valve intregal?

Posted by Brian Harbour on


5 Related Answers

Jaime Hernandez

  • 2337 Answers

SOURCE: car doesn't seem to get enough gas to engine

Have you done a tune lately on the car?
I would also suspect a fuel pump problem is you've done a tune up recently.

Posted on Jul 11, 2008


Michael Masters

  • 6784 Answers

SOURCE: location of fuel pump relay (1990 hyundai sonata)

The fuse box is located low on the left side of the dashboard behind a cover, or at the left side kick panel, behind a cover.

Relay Box -is located under the left side of the dash as well.


Posted on May 07, 2009


Scott McDonald

  • 68 Answers

SOURCE: how do you replace a window regulator on a 2001

Go to the free Kia tech website: You will find detailed instructions under the 2001 "MS" series Kia Optima. It is exactly the same as your Sonata. The site is free and anybody can access it. Just register, and allow some time to learn to navigate around. it can be tricky at first. Good luck, and remember to have your window securly taped fully closed. this will make it easier and quicker. best of luck!

Posted on Jan 30, 2010

jason jackson

  • 395 Answers

SOURCE: replaced fuel pump in 2000 hyundai elantra and

well if she ran it to long with no oil it might be locked up and might be able to turn it over if its not to bad. but you should still get power going to your fuel pump i would check all connection going to fuel pump and no broken wires. try even un plugging battery to see if there's a bypass

Posted on May 05, 2010


  • 104 Answers

SOURCE: 2001 hyundai sonata wiring diagram

You don't required to search for the wiring diaghram. These are standard in the wiring harness from the manufacturer. You need to look for the socket which may folded inside the console in front of you. Fix the audio in position and connect the cable socket for your new audio.

Posted on Jun 05, 2010

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Where is the fuel pump relay located at in a 2002 Hyundai sonata v6

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No cutoff switch on Hyundai cars. Only Ford products.
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Where is the Fuel safety shut off valve on a 2008 Sonata?

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If you have no fuel pressure I would check for voltage at the pump relay.

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Im gettin 11.9 mpg in 92 sonata 6 cylinder(3.0) I was told it could b my brain box. Would that be the engine control unit or the engine control module?

You have an engine control unit, but that is rarely the problem. Is your engine light on? If yes, let me know and I'll send procedures for extracting the trouble codes that may identify the problem.
If no engine light, the first thing I would check is the fuel pressure regulator. Pull the vacuum hose off the regulator and plug it with a golf tee. Start the engine and see if gas comes out the vacuum port on the regulator. Is indicates a busted diaphram. Even if the diaphram is good, I would then borrow a fuel pressure gage and run the tests below to make sure the regulator is working to keep the pressure at 39psi. Let me know if this isn't it or you have more questions.

  1. Relieve fuel system pressure.
  2. Turn ignition switch OFF and disconnect the negative battery cable.
When disconnecting any fuel system hoses, always place a shop towel to prevent residual fuel from spaying.
  1. Disconnect the high pressure hose at the delivery side. Using a fuel pressure gauge and adapter (09353-24000 or equivalent), install the adapter to the delivery pipe.
  2. Connect the negative battery cable.
  3. Activate the fuel pump, by applying battery voltage to the fuel pump drive terminal. Check that there is no leakage from pressure gauge or connections.


Fig. Fig. 12: Fuel pump drive terminal location-Excel

  1. Disconnect the vacuum hose from the pressure regulator and plug.


Fig. Fig. 13: Fuel pump drive terminal location-Sonata

  1. Operate the engine at idle and check the fuel pressure. Fuel pressure should be 47-50 psi (330-350 kPa).
  2. Reconnect the vacuum hose to the pressure regulator. With the engine idling, fuel pressure should be 39 psi (270 kPa).
  3. If the specified values are not met, make the necessary repairs, as indicated in the diagnosis chart.
  4. Shut the engine OFF. Check that the fuel pressure is maintained at the value indicated in Step 8, for approximately 5 minutes.
  5. Relieve the fuel pressure.
  6. Remove the fuel pressure gauge and reconnect the high pressure hose, using a new O-ring.
  7. Start the engine and check for leaks.

Nov 25, 2010 | 1992 Hyundai Sonata

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When trying to re-fuel my 2002 Hyundai Sonata GLS, the pump keeps shutting off as if the tank was full. I can get maybe a gallon at a time before it shuts off. Any ideas?

the vent valve in the tank is not working correctly,you need to ask a dealer if there are any technical service bulletins on this problem

Dec 25, 2009 | Hyundai Motor 2002 Sonata

1 Answer

My 2002 hyundai sonata acted like it wasnt getting enough fuel .we changed the fuel filter and the fuel pump now im not getting power to the fuel pump and the fuses are all good.HELP

check the impact saftey switch to see if it was tripped it should be listed in your owners manuel. It is a saftey feature in case of a collision it shuts down the fuel pump

Oct 16, 2009 | Hyundai Motor 2002 Sonata

1 Answer

Fuel pressure drops immediately to zero when engine is shut off.

I am not really familiar with the setup there but I'd be looking for a second relay to kick the pump on when cranking.

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