02 Sportage Fuel Pump - Kia Forum
 
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post #1 of 4 (permalink) Old 03-12-2012, 07:24 AM Thread Starter
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Default 02 Sportage Fuel Pump

Fuel pump relay not receiving a ground signal. I know this is not a new problem. The same issue has been posted previously, but I have never seen a good reason/fix for it. It seems to be a more and more common problem. I know that the ground signal comes from the ECU, but I wonder if other signals have to be present to get that initial pump operation with just key on; not starting the engine? I am getting the ground to the relay next to the fuel pump relay, so I am thinking the ECU is probably good. Any thoughts?? Thanks..

TommyJ
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post #2 of 4 (permalink) Old 03-17-2012, 02:02 PM
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Originally Posted by tommyleea View Post
Fuel pump relay not receiving a ground signal. I know this is not a new problem. The same issue has been posted previously, but I have never seen a good reason/fix for it. It seems to be a more and more common problem. I know that the ground signal comes from the ECU, but I wonder if other signals have to be present to get that initial pump operation with just key on; not starting the engine? I am getting the ground to the relay next to the fuel pump relay, so I am thinking the ECU is probably good. Any thoughts?? Thanks..

TommyJ
I would check & clean the ground ring for the fuel pump connection in the back cargo area: it's a known rust/issue point, and remove/reset/clean blades on both Main and FP relays in the engine compartment fuse box..

If the Main and FP relays are (original), consider swapping w/ new as a diagnostic test step.. A recent post by Galf details his experience, see below link:

http://www.kia-forums.com/1g-1994-20...running-3.html

Hope this helps.

Laptop/USB OBD-II Scanner at Amazon: search "ScanTool 423001 ElmScan 5" at amazon.com
OBD-II Codes: http://www.obd-codes.com/trouble_codes/
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post #3 of 4 (permalink) Old 03-18-2012, 09:02 AM Thread Starter
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Thanks..I do have some additional info. When I cranked the engine over fuel would then pump into my container. So, I connected everything back up, and it starts right up. I started it about 6 times, with no problems. It looks like the relays are original, so I will replace them. Still trying to figure out the key on, no fuel in container issue. More to follow..
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post #4 of 4 (permalink) Old 05-11-2012, 09:40 AM Thread Starter
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Just some additional info on power to pump. I noticed in the service manual, that every check that is done for fuel pressure with key on, it states to jump the DTC connector to make the pump run temporarily. Other fuel pump tests with key on engine off also state to jump the connector to make the pump run. I haven't run across anything yet that indicates the pump will run with key on, without jumping the connector. I am still reading thru the manual, but this was some info that I thought was interesting. It would explain my confusion about key on, no fuel in container. Cheers..
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