1995 Mitsubishi Eclipse. I have replaced the, fuel pump, fuel pump relay and the Emergency Engine Shutoff relay. It ran fine for about 2 weeks and now it is shutting off again. There is no power to the fuel pump. If I let it sit for a day or two it will start again but only run (idle) for 3 minutes and sometimes 15 minutes. I thought maybe there was a loose ground or a short but if it's sitting still, no one in the car. It just shuts off and it won't restart because the fuel pump does not come on. While it's running, i have grabbed the wiring at the steering column and under the dash, pulled it and wiggled. Doesn't make it turn off.
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Re: Losing power to the fuel pump
Well that sounds like a relay. if your car is an automatic, double check than you replaced the ASD and fuel pump relays and not the trans control relay. if its not the relay, its probably the ECU(PCM).
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There is no fuel cut switch on the diamant? the fuel pump relay is controlled by the ECM ground circuit to the fuel pump relay or the efi relays. If you need to turn the pump of find the fuel pump fuse and pull it out.
Is the Security light on? Could be too many things to list here. Step 1. Scan for codes. If no codes, see if it's losing spark or fuel or both. If it's losing fuel, it might be the pump or relay or wiring or computer. If no spark, it could be cam sensor or computer. Security light on means the key or anti-theft module has a problem. If equipped. Kind of what it sounds like, the computer shuts off the spark when the theft module does not detect the proper key chip.
there is no Emergency Relay. Have you verified the fuses are all good. Power on one side of the coils? Why were all these parts replaced? does the check engine light come on with the key on? I dont have a diagram, but all these must be good to at least try to run.
If it's like my 97, they are located on the firewall just to the right of the master cylinder. There are two of them and they are about 1" square with harnesses plugged into them. I had and intermintent problem with my 97 not starting. I took the rear seat out and turned the ignition on without trying to start it. You should hear the fuel pump kick on for a few seconds as it pressurizes the system. No whirrr, no power to the pump (or the pump is bad). There are two relays and I replaced the cheaper of the two to fix my problem.
On a 1995 Eclipse, the fuel pump relay is located under the hood, against the firewall right next to the brake fluid and washer tank. There should be 2-4 relays, and the fuel pump is usually the relay closest to the passenger side, or on the left.
the fuel pump relay is on the top driver side of the firewall near the brake fluid res. there is going to me 2 relays on a bracket bolt ed to the firewall. i cant remember which it is off the top of my head. but it is one of the 2
The power for the shutoff relay actually comes from a secondary winding on the ignition coil itself. Why the enging would shut the fuel pump off is that as the engine ran for a while the coil gets warm and then breaks down or opens up the circuit for the fuel shutoff relay. Fixed by replacing $85.00 coil.