No power to the fuel pump

Tiny
BOLONGO
  • MEMBER
  • 2002 HYUNDAI SONATA
  • 2.7L
  • V6
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
I have been chasing this problem for while now. The car started for a few seconds when I sprayed ether into the throttle body, so I replaced the fuel pump. When that did not solve the problem I checked for power at the pump connection and replaced the fuel relay when I found there was no power. That too did not solve the problem.

I then check the crank and cam shaft sensors and found that the connections were frayed, so I also replaced these components. The car ran for a week after I replaced these parts, then it stopped working again. Same symptoms as before (cranks but it does not start). This time, just before failing I noticed that fuel level gauge and the fuel door release solenoid stopped working. Also, when I press and hold the fuel door release button and any of the master power windows with the key off the ignition, the windows go up and down. I have a feeling there is a short that involves the fuel door release door and the fuel pump, but cannot think where/why/how the two systems electrical come together.
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Sunday, August 5th, 2018 AT 7:40 AM

3 Replies

Tiny
KEN L
  • ADMIN
Hello, there is an engine control relay I think is going bad. Here is a guide to help you test it and the engine wiring diagrams so you can see how the system works with a guide to help you test the connections. Also the location of the relay is under the radio next to the fuel pump relay.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

and

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Please let us know what you find.

Cheers, Ken
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Tuesday, August 7th, 2018 AT 11:17 AM
Tiny
BOLONGO
  • MEMBER
Hi Ken, Thank you so much for your fast reply. As it turn out all the things that I replaced were good preventive maintenance. The reason I had intermittent starts was a loose ground connection under the driver's seat that includes power to the fuel pump. However, diagnosing the problem came at a huge cost. You see, in order to replace the knock sensors I had to remove the intake manifold. In doing so, I carelessly dropped a washer into a cylinder head and now I'm scrabbling to find a way to pull it our without having to remove the head. The washer is too big to come out through the spark plug hole. Any ideas? Thanks again.
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Friday, August 10th, 2018 AT 11:40 AM
Tiny
KEN L
  • ADMIN
Oh man, that is a bummer. Try a magnetic attached to a thin wire and drop it past the intake valve is the only way if not you will need to pull the head. Glad you got the electrical issue fixed though. Please start a new question if you need diagram on how to pull the cylinder head.

Please post your new question here, you must be logged in.

https://www.2carpros.com/questions/new

Cheers, Ken
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Friday, August 10th, 2018 AT 11:48 AM

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