84GLturbo Posted February 10, 2018 Share Posted February 10, 2018 The Subaru saga continues. This car ran great and was garaged for 15 years and I am trying to get it back on the road. It is an 84 turbo 4wd coupe. I replaced the fuel pump and it worked perfectly but had a no spark situation and I traced it to the ignition control mod in the distributor. I replaced it and have spark now but I don't have power to the fuel pump now. The wiring diagrams show a fuel cutoff switch that is under the dash but I have spent hours going over everywhere and cannot find it. Any ideas would be greatly appreciated. Quote Link to comment Share on other sites More sharing options...
naru Posted February 10, 2018 Share Posted February 10, 2018 There is no fuel cutoff switch. Don`t know where you got that. Make sure you put all the wires back on the coil correctly. The grey shielded one on coil - is your rpm signal to the ecm. No fuel pump w/o that one. Check what is going on at the fuel pump relay under the seat. You need power to the relay from the fusible link and a seperate ground signal from the ecm to trigger it. I would jump the relay contacts to see if the pump runs. On my own 84 turbo,the fuel pump driver transistor in the ecm failed. I just took a trigger signal from elsewhere. Quote Link to comment Share on other sites More sharing options...
skishop69 Posted February 10, 2018 Share Posted February 10, 2018 +1 Since it was working before you changed the ICM, you either have a wire in the wrong place or you got a bad ICM. It happens. Quote Link to comment Share on other sites More sharing options...
84GLturbo Posted February 10, 2018 Author Share Posted February 10, 2018 I have a couple wiring diagrams that showed a fuel cut off switch is the reason I was looking for it. I had an older camaro that would trigger the cut off switch every time I disconnected the battery. I do not have anything under the seats, I actually pulled out both front seats and pulled the seat bottom off the back one. I can see the wiring coming from the pump going through the floor under the back seat and I can follow it to the door rail but that's it without tearing it all apart. I get the signal coming back from the ICM to the coil so shouldn't that also trigger the fuel pump? I am at a loss at this point, none of the components seem to be where they are supposed to be. The car is bone stock and was purchased new by my grandmother and garaged after her death in 99 with only routine maintenance. Quote Link to comment Share on other sites More sharing options...
84GLturbo Posted February 10, 2018 Author Share Posted February 10, 2018 I carefully marked all the wiring when I took it off and am confident it is all back together the way it came off. The only thing I did was disconnect the fuel pump at the pump when I was troubleshooting the no spark to keep it from running every time I turned the key on.... Quote Link to comment Share on other sites More sharing options...
naru Posted February 10, 2018 Share Posted February 10, 2018 I have a couple wiring diagrams that showed a fuel cut off switch is the reason I was looking for it. I had an older camaro that would trigger the cut off switch every time I disconnected the battery. I do not have anything under the seats, I actually pulled out both front seats and pulled the seat bottom off the back one. I can see the wiring coming from the pump going through the floor under the back seat and I can follow it to the door rail but that's it without tearing it all apart. I get the signal coming back from the ICM to the coil so shouldn't that also trigger the fuel pump? I am at a loss at this point, none of the components seem to be where they are supposed to be. The car is bone stock and was purchased new by my grandmother and garaged after her death in 99 with only routine maintenance. I have a couple wiring diagrams that showed a fuel cut off switch is the reason I was looking for it. I had an older camaro that would trigger the cut off switch every time I disconnected the battery. I do not have anything under the seats, I actually pulled out both front seats and pulled the seat bottom off the back one. I can see the wiring coming from the pump going through the floor under the back seat and I can follow it to the door rail but that's it without tearing it all apart. I get the signal coming back from the ICM to the coil so shouldn't that also trigger the fuel pump? I am at a loss at this point, none of the components seem to be where they are supposed to be. The car is bone stock and was purchased new by my grandmother and garaged after her death in 99 with only routine maintenance. Look under the carpet on the passenger side. Fuel pump and ignition relays are there. Quote Link to comment Share on other sites More sharing options...
84GLturbo Posted February 10, 2018 Author Share Posted February 10, 2018 I lifted the carpet on both sides when I had the seats out. the only wiring was for the seatbelt chime. I have searched online for pics so I know what I'm looking for but can't find a reliable pic. What does it look like? Quote Link to comment Share on other sites More sharing options...
84GLturbo Posted February 10, 2018 Author Share Posted February 10, 2018 Weirdest damn thing. I tapped the fuel regulator/distributor and the damn pump kicked on. Cranked for 10 seconds and she came to life! First time she has run in 15 years. A little out of time but that's an easy fix. Thank you for all the help and I am sure I will need more before she is road worthy. Quote Link to comment Share on other sites More sharing options...
hetrickj Posted February 20, 2018 Share Posted February 20, 2018 Hi, What model of fuel pump did you purchase? My fuel pump makes no noise and I want to replace it but was not sure which one to purchase. Thank you! Janice Quote Link to comment Share on other sites More sharing options...
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