Fuse block / fuel pump

[Buster96u]

'98 Kia Sephia
First post... I thought I had a bad fuel pump so I replaced it. When I turn the ignition to "RUN" there is no voltage going to the fuel pump or through the 10 amp fuse spot in the fuse block (micro relay is good and getting 12 v have not verified signal to relay yet) I applied 12 v to the pump and backside of the fuse hole to force it on but the car still will not start. I've got 48 psi in the fuel rail but when I pulled the rail out with the pump on and turned the engine over ,no fuel spray. The "igniters/coils" are fine and throw tight blue spark. I've checked all other fuses, harness connections and the ignition switch.
Is there something that would cause the pump not to come on and keep the injectors from firing?

[slydog]

FIrst question would be why did you think your fuel pump was bad ? Also even if the fuel pump is running the injectors are controlled by the ECM (computer) so it sounds like your computer is not getting +12v, which could be caused by a fuse or faulty ignition switch.

Slydog

[Buster96u]

Sly Dog

The first time the car died it shuddered like it was starving for fuel. I had someone turn the key but could not hear the pump "whirring." I checked all the fuses and relays then applied 12v to the pump. The pressure only registered 13psi at the rail. So I changed the pump. The car starts with starting fluid at the throttle body.

[Buster96u]

Sly Dog

Forgot the second part. I'll spend some time tomorrow checking the voltage to and at the ECM. Thanks for the advice. It's always best to get another opinion. Especially when your frustrated and buzzed from gas fumes.

[slydog]

"The car starts with starting fluid at the throttle body"

It sounds like you know your way around an engine and know what to look for, and the above quote answers a lot of questions as what to troubleshoot next.

If car started to die while driving but it starts on starting fluid then....

1. you have good spark/ignition
2. compression and timing is close enough to run
3. but car is not getting fuel via the injectors/fuel pump

I would first of course check the fuel pump, fuel pump relay, fuel rail pressure, then move on to the electrical system........

1. check ECM fuse
2. make sure ignition switch is good

SInce the computer controls fuel delivery and the running of the injectors it sounds like an electrical problem with the ECM not receiving power or bad wiring in the fuel pump circuit.

Best of luck..................Slydog

[claytonjburgos]

if your camshaft or crankshaft sensor is bad or out or your timing the ecm shuts power to the fuse block try checking them

[Buster96u]

How do you check the two sensors? Are they magnetic then check for continuity?

I replaced the ECM and it is still a no go. I'm still not getting power to the fuel pump at the fuse when ignition is at run/on. The fuel pump relay has 12v at the hot leg but I don't know that it is getting a signal to the relay to close the circuit. I have 12v at the injector fuse but I don't think the injectors are firing. Could both of these issues be related to the two sensors? If so why would I not get power to the fuel pump if the engine isn't turning for the two sensors to fail?

[kiaracer]

if the crankshaft sensor was bad, there would be no spark and it wouldn't start with starting fluid. it could be the camshaft sensor because that controls injector pulse.

is there any codes in the ECU?
is your injector fuse good?

[slydog]

Whats your fuel rail pressure ? And do you have an OBD2 scanner with live data or freeze frame ? Any codes ? Sounds like a hard one to troubleshoot, but if you had at least a code to point you in the right direction that can help alot.

Best of luck.................Slydog

[pageus]

I am having the same issue on one that I just purchased.. however i did a lookup on the recall papers.. While it seems that something this simple shouldnt be the problem.. You might look into it. I will be tommarow

Auto Recall Date: 11/09/1999
Vehicle Component: FUEL SYSTEM, GASOLINEELIVERY:FUEL PUMP
Estimated Vehicles Affected: 102944
1998 KIA SEPHIA Defect Summary:
VEHICLE DESCRIPTION: PASSENGER VEHICLES. THE ELECTRICAL CIRCUIT FOR THE FUEL PUMP IS GROUNDED AT JUNCTION CONNECTOR G300. IF THE PIN TENSION

IS POOR, OR THE BOLT SECURING THE CONNECTOR TO THE VEHICLE FLOOR IS NOT TIGHTENED SUFFICIENTLY, A POOR CONNECTION IS MADE. AS THE FUEL PUMP OPERATES, THE POOR CONNECTION CAN CREATE HEAT WHICH IN TURN INCREASES RESISTANCE. EVENTUALLY THE FUEL PUMP WILL NOT RECEIVE ENOUGH CURRENT TO OPERATE.
Defect Consequence:
THIS CONDITION COULD CAUSE THE ENGINE TO STALL, INCREASING THE RISK OF A CRASH.
Remedy:
THIS CORRECTIVE ACTION IS BEING PERFORMED IN CONJUNCTION WITH RECALL NO. 99V317.
Notes: KIA MOTORS AMERICA, INC.,

Auto Recall Date: 11/09/1999
Vehicle Component: FUEL SYSTEM, GASOLINEELIVERY:FUEL PUMP
Estimated Vehicles Affected: 102944
1998 KIA SEPHIA Defect Summary:
VEHICLE DESCRIPTION: PASSENGER VEHICLES. ELECTRICAL CURRENT TO THE FUEL PUMP PASSES THROUGH THE C304 AND C305 CONNECTORS. IF EXPOSED TO MOISTURE, THESE CONNECTORS COULD CORRODE. OVER TIME, THE FUEL PUMP WILL NOT RECEIVE ENOUGH CURRENT TO OPERATE.
Defect Consequence:
THIS CONDITION COULD CAUSE THE ENGINE TO STALL, INCREASING THE RISK OF A CRASH.
Remedy:
DEALERS WILL REPLACE THE EXISTING CONNECTORS AND REPOSITION THOSE CONNECTORS TO AN AREA WHERE THE PLACEMENT IS DESIGNED TO PREVENT CONTACT

WITH MOISTURE.
Notes: KIA MOTORS AMERICA, INC., SC013