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Kia Spectra 2007 Fuel Pump Draining Battey


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mavs91
New User

Dec 5, 2013, 11:29 PM

Post #1 of 12 (3466 views)
Kia Spectra 2007 Fuel Pump Draining Battey Sign In

I carried out a parasitic drain test to see what electrical component of my car was causing my battery to get drained so quickly and found that it was the fuel pump. At this point however, I don't know how to resolve the issue. I tried for a simple fix by ordering a new fuel pump relay but that didn't fix the issue. If it’s not the relay, what else could it be? I don't know too much about cars but could be some other component connected to the fuel pump? I would appreciate any suggestions.

Also, I should probably mention that my works fine otherwise. I am still able to drive it, I just need to take out the fuel pump relay every time I park to prevent battery drain.


(This post was edited by mavs91 on Dec 5, 2013, 11:34 PM)


DanD
Veteran / Moderator
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Dec 6, 2013, 5:19 AM

Post #2 of 12 (3429 views)
Re: Kia Spectra 2007 Fuel Pump Draining Battey Sign In

So you're saying that the fuel pump runs continually with the relay in place? Or is it not running and it's just the relay that's drawing the battery down?
If the pump is running and you can hear the relay click when you remove or install it. The relay control wire or the ECM driver is shorted to ground turning the relay and pump on.
An ECM (computer) driver is an on/off switch inside the ECM; it is not serviceable on its own.
I'm not saying it's the ECM, there are a few things we can do to check this; but I'll wait for your reply before we continue.

Dan.

Canadian "EH"






Hammer Time
Ultimate Carjunky / Moderator
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Dec 6, 2013, 5:34 AM

Post #3 of 12 (3424 views)
Re: Kia Spectra 2007 Fuel Pump Draining Battey Sign In

I don't think the fuel pump relay trigger can be the sole cause of this. The way this is wired, the relay receives trigger power from the PCM main relay so that would have to remain powered with the key off in order for the fuel pump relay to trigger. I'm really questioning the problem is in the fuel pump circuit at all unless you're actually hearing the fuel pump run.

Which fuse are you finding the drain on?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



DanD
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Dec 6, 2013, 5:47 AM

Post #4 of 12 (3419 views)
Re: Kia Spectra 2007 Fuel Pump Draining Battey Sign In

Good point HT.
When I looked at the diagram, it looked like the fuel pump relay's pull-in coil got its power from the ECU2 fuse.
But now after putting my glasses on is see what you're saying.
I guess I'd better use the zoom in button a little more along with my glasses. LOL

Dan.

Canadian "EH"






Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 6, 2013, 5:50 AM

Post #5 of 12 (3415 views)
Re: Kia Spectra 2007 Fuel Pump Draining Battey Sign In

LOL................ happens to me all the time.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



DanD
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Dec 6, 2013, 6:05 AM

Post #6 of 12 (3413 views)
Re: Kia Spectra 2007 Fuel Pump Draining Battey Sign In

So I guess everything I said in my first post about the fuel pump relay; we should be talking about the MAIN Relay?
We also need more info; because if it's the main staying on; there are so many other things it powers up, that would also kill his battery?

Dan

Canadian "EH"






Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 6, 2013, 6:14 AM

Post #7 of 12 (3409 views)
Re: Kia Spectra 2007 Fuel Pump Draining Battey Sign In

I really think this guy is wrong about the fuel pump altogether. There just has to be too many ducks to line up in a row for that too happen. BOTH relays would have to be locked on and that's not real likely.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



mavs91
New User

Dec 6, 2013, 10:19 AM

Post #8 of 12 (3390 views)
Re: Kia Spectra 2007 Fuel Pump Draining Battey Sign In

The drain is also coming from the fuel pump fuse. An additional observation is that when I re-insert the relay, I can hear a very faint humming sound. I dont know if this is the fuel pump running or something else. Again, like I said, I am by no means a car expert, but what seems to prevent the drain is removing the fuel pump relay/fuse. I don't think there's anything wrong with the fuel pump itself because the car runs fine. So do you think the PCM main relay is the issue?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 6, 2013, 10:25 AM

Post #9 of 12 (3385 views)
Re: Kia Spectra 2007 Fuel Pump Draining Battey Sign In

That fuse doesn't seem to feed anything but the fuel pump relay and only the feed side of that. You are going to have to get your hands on a test light that tests for both power and ground using LED bulbs, and test the relay socket to see what signal you find in each contact so we can figure out why this is doing this.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



mavs91
New User

Dec 6, 2013, 10:46 AM

Post #10 of 12 (3381 views)
Re: Kia Spectra 2007 Fuel Pump Draining Battey Sign In

How would I go about testing the relay socket?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Dec 6, 2013, 10:53 AM

Post #11 of 12 (3379 views)
Re: Kia Spectra 2007 Fuel Pump Draining Battey Sign In

Tell me if you find power, ground or nothing at all in each one of the 4 sockets.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



DanD
Veteran / Moderator
DanD profile image

Dec 6, 2013, 11:41 AM

Post #12 of 12 (3374 views)
Re: Kia Spectra 2007 Fuel Pump Draining Battey Sign In

When you remove/install the fuse or the fuel pump relay do you hear or feel the relay click?

Dan.

Canadian "EH"










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