Problems with fuel pump, 2g

[MrBeast225]

Alright, so I've searched on here, and found a couple of valuable threads that basically gave me a great place to start, but I still havent been able to crack whats wrong.

Basically, the fuel pump is not priming/getting power. The pump is good, as its brand new (and ive tested it by hooking up 12 v of power to it from the battery, it turned on).

So far, Ive bought a new fuel pump/mfi relay, and checked fuses 1 and 12 in the car on the driver side. Under the hood in the main fuse box it appears that all the fuses are in working order.

As far as the two relays go, only the relay on the left is getting power, the relay on the right is not (tested with a light tester). I've read though that the MFI relay sends power to the fuel pump relay, so I'm not too sure if that has anything to do with it or not... Also since mine is just hanging down, and wasn't bolted in, im not even sure which relay is which @_@.

Ive read a couple times about a few fuses being on the fire wall, with one of them having to do with the firewall, but my car doesn't have it? I'm assuming that was for the GS model only, and not the GST?

The car I have is a 98 Eclipse GST.

Any thoughts on whats wrong?

And just to be sure.... heres a pic of the relays I replaced. There in the middle of the car, behind the stereo, on the passenger side.

Sorry for the lengthy thread, any help anyone could offer me would be great, as I am terribly confused .

Just noticed the pic is upside down.... sorry bout that.

Just noticed that the pic is upside down... Sorry bout that

 

[MrBeast225]

Ok so while the multimeter continues to confuse me... I have a light tester to see if power is going through (all you do is attach it to a ground, and then touch the other end on what your wanting to see if power goes through, if theres power light goes on).

So with the light tester, and the ignition turned on, the harness for the CAS seems to be getting no power.

Hey before we continue, I just want to thank you guys, and especially you miguel for all the help I'm getting. I greatly appreciate it.

 

[MrBeast225]

Also when I try to turn the engine over, the light tester reads no power from any port of the cas harness connector.

 

[miguelmcv]

Ok, I see, well Now we know the MPI relay is working,, the relay sends power to the cas, cps, both o2 sensors, fuel solenoid, turbo wastage solenoid, and some others, so saying that, your cas + wire is no good, you can trace the wire and see where is damaged, or you can just add current temporality from any of the sensor stated before.

Just add + to the cas and see what it does, give a try and see if it starts, or if you get spark, (no wonder you have no spark).

 

[MrBeast225]

Ok so just to clarify, I ran a positive line to the cas sensor (with the harness unplugged), and nothing happened when I tried to turn it on or over (I had the positive line attached to the prong that the red wire from the harness would attach too).

Did you want me to splice a positive line to the harness red wire itself, and then plug that in and see what it does? Or just move on to something else?

Seeing that you said that the MPI sensor sends power to it all, my MPI sensor (the harness that connects to it) is not getting power, but the harness that plugs into my fuel pump sensor is.

I thought the MPI sensor powered the fuel pump relay though?

 

[miguelmcv]

Ok so just to clarify, I ran a positive line to the cas sensor (with the harness unplugged), and nothing happened when I tried to turn it on or over (I had the positive line attached to the prong that the red wire from the harness would attach too).

Did you want me to splice a positive line to the harness red wire itself, and then plug that in and see what it does? Or just move on to something else?

Seeing that you said that the MPI sensor sends power to it all, my MPI sensor (the harness that connects to it) is not getting power, but the harness that plugs into my fuel pump sensor is.

I thought the MPI sensor powered the fuel pump relay though?

No, The MPI Relay running the fuel pump mith is only on the 95/96 cars, the 95/96 has only one relay, the relay feeds all the sensors that I stated before, and feeds the Fuel pump as well, It is 2 relays inside of one (one case relay and one plug).

Now, the 97/99 came with 2 relays, two seperate relays, so one is for the fuel pump and the other (MPI) is for the sensors in the bay area, If you see your relays, they are two relays, one is the PMI and the other is the fuel pump relay.

You need to make sure to have power to all sensors includng cas and cps.

Here is an electrical manual for your car, http://www.dsmtuners.com/forums/fre...stions/324090-download-2g-service-manual.html downlowd it and take a look on the MPI relay and fuel pump relay, You will see all the sensors that feeds the relay and it can guide you on the wiring.

I would like you to take a look at it and have a better knowledge on the wiring so it gets more easy for you to understan.

Check what sensors have power and which ones doesn't and let us know.

Sorry for the late replay but my internet is not working and It will take for ever to reply with my crapy phone.

 

[MrBeast225]

Bro no problem, I appreciate all the help your giving me, no complaints here trust me .

I'll check the relays tomorrow though and get back to you.

As far as the service manual, I'll download that here in a bit as well. I've looked at the wiring diagrams before, and I kind of have an ideal of what's going on, but there's still a bit of confusion... Lol. Either way I'll try and study it later tonight as well.

 

[MrBeast225]

No, The MPI Relay running the fuel pump mith is only on the 95/96 cars, the 95/96 has only one relay, the relay feeds all the sensors that I stated before, and feeds the Fuel pump as well, It is 2 relays inside of one (one case relay and one plug).

Now, the 97/99 came with 2 relays, two seperate relays, so one is for the fuel pump and the other (MPI) is for the sensors in the bay area, If you see your relays, they are two relays, one is the PMI and the other is the fuel pump relay.

You need to make sure to have power to all sensors includng cas and cps.

Here is an electrical manual for your car, http://www.dsmtuners.com/forums/fre...stions/324090-download-2g-service-manual.html downlowd it and take a look on the MPI relay and fuel pump relay, You will see all the sensors that feeds the relay and it can guide you on the wiring.

I would like you to take a look at it and have a better knowledge on the wiring so it gets more easy for you to understan.

Check what sensors have power and which ones doesn't and let us know.

Sorry for the late replay but my internet is not working and It will take for ever to reply with my crapy phone.

Okay, so I've tested the CAS, CPS, & MPI. They all aren't receiving power. Mentioning what you stated earlier about the MPI giving power to the sensors in the engine bay. I'm assuming power not going to the MPI is my problem? what would u suggest next?

 

[MrBeast225]

Oh and I forgot to mention that both the harness to the coil, and the fuel pump relay both receive power

 

[miguelmcv]

Haaaa, Now we are talking, looks like some one is doing his homework.

OK, If your Fuel pump relay has power, then the Fuel pump, Coils and transistor should have power, so if your MPI relay is not getting power, then check the fuse, it is located at the engine fuse box, it is #4 fuse, and stands as Engine sothing, I beleave is a 20amp fuse, remove it and check for power, if there is power and the fuse is good, then you have a bad wire (broken wire) you have to trace the line, the fuse wire goes all the way to the mpi relay.

let us know what you find.

 

[MrBeast225]

Sorry bout the late reply. Ok, so the box is giving power an the relay is good. So now it's off to the wire -_-. Any tips on doing this? Never replaced a wire that was in the harness before. This is going to take some work

 

[miguelmcv]

OK, you have to check from the Fuse box to the connector (A32), the pic you posted on post #5 tells you the connector, This is a 2 wire connector.

Remove the fuse at the fuse box, then unplug the 2 wire connector (A32) and test for continuity, if the wire is good from the fuse to the connector, then you know you are good there, then you have to check continuity from the other side of the connector to the MFI relay.

If you don't have continuity from the connector to the MFI relay, then you have to open the wire loom from the connector (A32) all the way to the MFI relay (yea, I know, it's a pain in the ###), but you have to fallow the wire till you find where the wire is bad and fix it, Don't forget that this line splits in two at the MFI relay, so you have to see continuity on both lines at the MFI relay.

HO, and the A32 connector is located on one side of the fuse box, check the manual to located it.

I will be out of town for 2 weeks and will not have the time to help you out at that time,,,,,
But Hopefully, some one will jump in and give you a hand, however, if I have a chance, I will jump in and see what I can do.


Good luck Bro.

 

[MrBeast225]

You are a god send, thanks a lot bro. I'll jump on it this weekend and hopefully have it figured out by then .

 

[MrBeast225]

So, I finally got it work last night. After cutting open all my wire harnesses, chasing wires around, I noticed something incredibly simple.... my damn A32 was plugged into my transmission (automatic), and vice versa. Put them back where they were suppose to be, and all of a sudden I have spark - _ -. I cant think of any other moment in life where I've felt dumber haha.

Now the only problem is that my fuel rail leaks @_@, no one has what I need on island so I'm going to see if I can JB weld this or something, otherwise its another week for shipping till I can do anything .

 

[miguelmcv]

Where exactly in the fuel rail is leaking, what part you can't find on your area.

Haaaa, those kind of mistakes are the once that makes you a dsmer. Haaaa.

 

[MrBeast225]

I'll get back to you on that, as I think I've found away to fix it . I was talking about an aem fuel rail though

 

[Joshygst]

Do You have pic of what you did I am having the same problem