2G MFI/Fuel Pump Relay

[bjbaxter]

On my 98 GST, are both the MFI relay and Fuel Pump Relay right next to each other and look exactly alike (a black box/relay, that has four flat prongs).

The number on both of them was E8T101 7823

That's exactly how it was written on the parts. Not sure if it was because the number was too long for the short length or what, but that's how it was. Any help, suggestions, or anything would be greatly appreciated!!! I need to get my car back on the road, its becoming a garage queen

Wait, the 7823 was below the E8T101, not all goofy looking like it is right now.

 

[turbosax2]

The fuel pump relay and MFI relay are both located at "Y" in this picture.

 

[turbosax2]

Here is how to test the fuel pump relay.

 

[luv2rallye]

Wait, the 7823 was below the E8T101, not all goofy lookin like it is right now.

That is not the part number. The correct part number is MR224159. BTW in the above picture, the MFI relay is the one on the right.

 

[bjbaxter]

Let's see if somone can answer this question about my thread here... When the fuel pump relay goes bad, it wont allow the fuel pump to kick on or tell the ecu when to kick a signal to the coil as to when it needs spark, right?!? Being that if there is spark and no fuel the motor will blow up, correct??

 

[luv2rallye]

When the fuel pump relay goes bad, it wont allow the fuel pump to kick on or tell the ecu when to kick a signal to the coil as to when it needs spark, right?!? Being that if there is spark and no fuel the motor will blow up, correct??

Oh sooooooo close...but....backwards. Nice try though! On 2g turbos and all 1g, the ECU turns the FP relay on when it detects the coil is firing. So only while spark is present will the FP be on (safety issue for like a crash/rollover). This is why on 2g turbos and all 1g (but not 2g NT however) the FP will not be on with the engine not running and the key to just ON.

And BTW, spark and no fuel (eg. which can easily happen when FP itself is not working but relay is, or the fuel tank is empty) will not blow up your motor !

 

[bjbaxter]

Thats not really making a whole lot of sense to me Why would you be able to get spark with no fuel?? How come thats not dangerous?? Isn't it the same as saying throwing a match in a full gas tank is actually better than throwing a match in an empty tank because of the fumes?? please let me know what you think. thanks

 

[luv2rallye]

Why would you be able to get spark with no fuel?? How come thats not dangerous??

When the fuel tank goes empty that's exactly what you have. With no fuel, a spark inside the cylinder ignites nothing so is not dangerous. But if fuel were still to be flowing and the fuel line breaks (due to a crash, etc), an external spark could be very dangerous! Of course Chysler (2g NT) has a different view.

 

[bjbaxter]

Hahaha gotcha, thats making some sense to me, thanks

 

[Newport VR-4]

luv2rallye- I have the same issue as bjbaxter on my VR-4 and took the MFI relay to HB Mitsu and Costa Mesa Mitsu and nobody can match the part # or pic in a catalog. HB Mitsu also took pics and sent them to corporate and they sent back a fuel pump relay that was wrong. Although my relays read E8T101 7617. How did you track down the correct part number? Thank you very much for your help.

 

[luv2rallye]

How did you track down the correct part number?

Can't remember - I think I cheated and just looked at them in my 99. Or maybe I called Satan since everyone keeps asking this question.

 

[1st2geclipse]

This is the first turbo eclipse i have ever owned and the car came to me with no fire and no power to the fuel pump. I have read the manual and talked to a few people and have come to the conclusion that it is either the ecm or the mfi and fuel pump relays. I have tested the relays and they ohm at 73.3 and 74.2 which i am assuming means that they are bad but can't find them anywhere. I also ordered a computer just in case. I know the fuel pump works because i hooked it to the battery and it kicked on. I am not sure what else to do so any information would be very appreciated.

 

[luv2rallye]

Those resistances are good.

On the MFI relay ground the blue/green wire (pin 2) and see if you get +12V on the red only (pin 1) wire to check if relay works properly - this supplys power to the ECU main and most engine electrical (part of the ECU normally does this).

On the FP relay ground the white/red wire (pin 2) when ignition key is ON to check if FP turns on to see if relay works properly (ECU normally does this but ONLY when engine is cranking or running - NOT stopped with just key ON). And of course the MFI relay must be working first.

If these pass open up the ECU and check/smell for leaking capacitors.

 

[Gunter]

Which prongs would you connect to jump the fuel pump relay?

 

[1st2geclipse]

I checked and everything seems to check out but still nothing. I checked the relays by strate wiring the relays like it says to in the manual and they click but hooked back up to the car do nothing. I checked for power from the harness and it is hot not sure why the relays will not click while hooked to the power of the harness. Not sure whats going on? Would also like to know if anyone knows where I can find a turbo manual trans to swap out the automatic with, found one local but its an all wheel drive and do not know if it can be used as an two wheel drive or not?

 

[luv2rallye]

Which prongs would you connect to jump the fuel pump relay?

Remove FP relay and jumper socket pin 3 or 4 (both are black/white wires and are connected together) to socket pin 1 (black/blue). This is exactly what the relay does and you will need ignition key on for power. Or you can just connect +12V (but should go thru a 10 amp fuse for safety) to pin 1 (black/blue) which powers FP directly .

 

[1st2geclipse]

I checked everything that i could think of and finally decided to just go ahead and change the crank sensor and the car started right up so apparently the crank sensor does cut out the fuel pump and the fire. thanks again for the advice.

 

[mchandla]

is there a such thing as an injector relay? my car is getting spark and fuel to the rail but not to the injectors and they flowed fine about a month ago when it stopped running. the part number for the part I need is E8T08474 and everytime I search for it nothing comes up at all. If anyone could help me I would really appreciate it.

 

[steve]

is there a such thing as an injector relay? my car is getting spark and fuel to the rail but not to the injectors and they flowed fine about a month ago when it stopped running. the part number for the part I need is E8T08474 and everytime I search for it nothing comes up at all. If anyone could help me I would really appreciate it.

No there isn't an injector relay.

A search of E8T08474 shows that it is the MPI relay for a 1995 MY DSM.
http://www.dsmtuners.com/forums/new...what-thing-imasen-e8t08474.html#post151387017

I don't know why you had problems searching. I used google and got several pages.

 

[sirspoolalot]

The fuel pump relay and MFI relay are both located at "Y" in this picture.

Do you have a picture like this for the 1st gen?

I believe the relay is ####ed up because when I turn the key to "on" I don't hear the fuel pump priming. Not sure what's causing it but I heard it could be the relay. Any suggestions?

 

[turbosax2]

The fuel pump will not prime with the key to "on". That is normal.

 

[steve]

Do you have a picture like this for the 1st gen? I believe the relay is ####ed up because when i turn the key to "on" i don't hear the fuel pump priming.....Not sure what's causing it but i heard it could be the relay. Any suggestions?

Same location different car.

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The fuel pump doesn't turn on until you crank the engine with the starter or the CAS indicates that it's spinning. (not coils firing as mentioned above)

MPI relay failure is very low on the list of things that go wrong. Get the wiring diagram and start diagnosing your symptoms by measuring the voltages and manually triggering the relay by grounding or providing voltage to the coil as needed.

 

[misterskeetz]

This is the part that I need and I can't find one anywhere on the net! If anyone has a link to where I can get one, please PM me with the link. Mitsubishi says they can get one but it will have to wait until Oct. 12th at the earliest.

 

[z24frank]

Same location different car.

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The fuel pump doesn't turn on until you crank the engine with the starter or the CAS indicates that it's spinning. (not coils firing as mentioned above)

MPI relay failure is very low on the list of things that go wrong. Get the wiring diagram and start diagnosing your symptoms by measuring the voltages and manually triggering the relay by grounding or providing voltage to the coil as needed.

Would this relay be the reason I keep blowing the 20 amp fuse on my 1g?

 

[steve]

Would this relay be the reason I keep blowing the 20 amp fuse on my 1g?

Perhaps but it's more likely that it's something on the downstream side of the relay that is popping the fuse.