Fuel pump?

Tiny
JASON WATSON
  • MEMBER
  • 2003 KIA SORENTO
  • 3.5L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 123,000 MILES
Fuel pump went bad. I changed it and now there is no power to it. I can bypass the fuel relay and it works. Checked fuses and cut off switch, and no power to either side of switch.
Do you
have the same problem?
Yes
No
Friday, November 10th, 2017 AT 4:53 PM

31 Replies

Tiny
WRENCHER1
  • MEMBER
Do you realize that is only powers for two seconds when the key is first turned on? You need two people to test this properly. If so lets check the fuses first here is a guide to help check the fuses and the fuse location below.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the diagrams (Below). Please let us know what you find.
Was this
answer
helpful?
Yes
No
+3
Friday, November 10th, 2017 AT 6:19 PM
Tiny
JASON WATSON
  • MEMBER
No I did not know that. Will test that. Do you have any idea of what else it could be?
Was this
answer
helpful?
Yes
No
-3
Friday, November 10th, 2017 AT 6:36 PM
Tiny
KEN
  • ADMIN
Hello,

It sounds like you may have a fuse (fuel fuse) that could be out. Lets check for power at the fuel pump relay and then test the relay.

Here is a guide to show you how to do the test:

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

and

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please recheck the fuses as well.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Here are the fuse panel and engine with fuel pump wiring diagrams so you can do some simple tests (below).

Let us know what happens and please upload pictures or videos of the problem.

Cheers, Ken
Was this
answer
helpful?
Yes
No
-2
Monday, November 13th, 2017 AT 3:05 PM
Tiny
JASON WATSON
  • MEMBER
Ok 30 85 when the switch is off I have 12volts and when the switch is on only have 3.5and 30 86 is hot saltines don't have anything from the rest this is with the relay out, u have tryed changing them no difference
Was this
answer
helpful?
Yes
No
+1
Monday, November 13th, 2017 AT 3:22 PM
Tiny
JASON WATSON
  • MEMBER
I meant 30 86 is hot al time
Was this
answer
helpful?
Yes
No
+2
Monday, November 13th, 2017 AT 3:22 PM
Tiny
KEN
  • ADMIN
It sounds like the computer is not triggering the relay to operate. Can you check the ignition system for spark? This will tell us if the computer is seeing the engine rotation.

Here is a guide.

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Please let us know what happens.

Cheers, Ken
Was this
answer
helpful?
Yes
No
Tuesday, November 14th, 2017 AT 9:38 AM
Tiny
JASON WATSON
  • MEMBER
I have spark, it will run if I bypass the relay, ok I have a question fuel cut off switch, yellow and red wire one goes to the pump right, I hook power at the switch and still no power at the pump, I put it on diagnosis and there are no codes, getting power to every plug on the fuel pump but the red and black
Was this
answer
helpful?
Yes
No
+1
Tuesday, November 14th, 2017 AT 10:10 AM
Tiny
KEN
  • ADMIN
You need to have power at the red wire. It looks like the fuel fuse is what supplies power through the fuel cut off switch. Can you see if there is power at the switch?
Was this
answer
helpful?
Yes
No
+1
Tuesday, November 14th, 2017 AT 11:58 AM
Tiny
JASON WATSON
  • MEMBER
No power at switch either side
Was this
answer
helpful?
Yes
No
Tuesday, November 14th, 2017 AT 1:24 PM
Tiny
JASON WATSON
  • MEMBER
Fuse iOS good guess I will have to trace it down, don't know what else to do
Was this
answer
helpful?
Yes
No
Tuesday, November 14th, 2017 AT 5:52 PM
Tiny
KEN
  • ADMIN
Use the test light to see where you lose power. Take you time and follow the power on the wiring diagram and you will find the problem.
Was this
answer
helpful?
Yes
No
Wednesday, November 15th, 2017 AT 10:32 AM
Tiny
WRENCHER1
  • MEMBER
Don't forget what I posted earlier. This relay only powers for 2 seconds when the key is first turned on and doesn't resume until the engine is cranking and the computer sees a tach signal.
Was this
answer
helpful?
Yes
No
Wednesday, November 15th, 2017 AT 11:34 AM
Tiny
JASON WATSON
  • MEMBER
Ok, hunting it down, thanks
Was this
answer
helpful?
Yes
No
Wednesday, November 15th, 2017 AT 2:15 PM
Tiny
JASON WATSON
  • MEMBER
  • 2003 KIA SORENTO
  • 3.5L
  • V6
  • 2WD
  • 123,000 MILES
Okay, I checked the fuel relay I got from 30-86i have twelve volts 30-85 I have. 24 85-86 I have twelve. No difference after crank up and it sits there with the switch on.
Was this
answer
helpful?
Yes
No
Monday, December 28th, 2020 AT 12:25 PM (Merged)
Tiny
STEVE W.
  • EXPERT
Pin 87 should be the power feed from the relay to the pump. Pins 85/86 are both sides of the coil. Pin 30 is twelve volts from the pump fuse.

If you jump from pin 30 to pin 87 in the socket the pump should run if the pump is good. If you want a quick test of the circuit put a test light in as a jumper. If the pump circuit is good the light should turn on.

There is a fuel cut sensor shown in the power line to the pump. That is in the right hand side of the engine compartment with a yellow wire and red wire in its connector. If it fails or opens no power gets to the pump. But other than telling where it is there is no other information in the service information

The pump ground wire is a black wire behind the right taillight.
Was this
answer
helpful?
Yes
No
Monday, December 28th, 2020 AT 12:25 PM (Merged)
Tiny
JASON WATSON
  • MEMBER
Okay, yes it will jump. I tested the volts at the pump there are five wires at start it is twelve and after it is ten. The only wires getting anything from are the green and a black one. There is also blue, red, and another black. I have two pumps and neither one will make it run. I am lost and confused. Please help.
Was this
answer
helpful?
Yes
No
-1
Monday, December 28th, 2020 AT 12:25 PM (Merged)
Tiny
STEVE W.
  • EXPERT
OK, you say the pump will turn on with it jumped? Correct?

When you say you have two pumps but neither makes it run, are you saying that they work but the engine won't run?

How about we back up a bit and give me a description of what this vehicle isn't doing, and how you determined it's a fuel problem?
Was this
answer
helpful?
Yes
No
Monday, December 28th, 2020 AT 12:25 PM (Merged)
Tiny
JASON WATSON
  • MEMBER
I can put gas in the breather or bypass the fuel relay and the car will run but hook it up the way it's supposed to be the car starving for gas until it won't start
Was this
answer
helpful?
Yes
No
+1
Monday, December 28th, 2020 AT 12:25 PM (Merged)
Tiny
JASON WATSON
  • MEMBER
The only wires getting anything are green and black 12 at at start and 10, don't make any since to me to test the pump wires are blue and black
Was this
answer
helpful?
Yes
No
Monday, December 28th, 2020 AT 12:25 PM (Merged)
Tiny
STEVE W.
  • EXPERT
So if you install the pump relay the engine doesn't get enough fuel but if you jump the relay out it does? And it runs like normal with the relay jumped out?

The only thing that changes is the control from the PCM.

Do you have a way to test the fuel pressure at the rail? A gauge tapped into the main line should show about 39 psi with the engine running at idle. If you see that with the relay jumped then the pump and lines are OK and the issue is likely the PCM itself has a problem controlling the relay.
Was this
answer
helpful?
Yes
No
+1
Monday, December 28th, 2020 AT 12:25 PM (Merged)

Please login or register to post a reply.

Sponsored links