DwayneOxford Posted January 5, 2023 Report Share Posted January 5, 2023 '85 720, 2400 eng., auto trans, std. cab. Orig. prob, no fire to fuel shut off solenoid, couldn't idle. Solved by baring spot on red solenoid wire and soldering un-needed choke heater wire to it. Runs OK now, key switch wont kill ignition. Unplugged the black relay that's with the fuel pump control module and a brown relay and it turns off OK. Anybody able to help? Quote Link to comment
Thomas Perkins Posted January 5, 2023 Report Share Posted January 5, 2023 Hi Dwayne.Are you running a Weber.You may need a new idle cut off solenoid.I have had to replace a few on mine with new o rings.I don't use the Weber Redline one's.I use the Empi-43-5350 one's with the large 0.155 big jet.To see if the idle cut off solenoid is working.Pull the red wire from it while it is running and engine will cut off.Also don't over tighten them and make them snug with the o ring.You are using the blue wire for the choke.If you buy the Empi one's,you will have to buy the o ring and jet separately.I did.I have tried to use a Weber Redline one and it wouldn't work.Also it could be something other than this.If your alternator is running weak,it could be that,or your battery or fusible link.If your alternator over charges it will cause all kinds of problems.Mine did and it made the relays under the glove box make clicking noises.Remember it's a 720 and anything is possible... 1 Quote Link to comment
DwayneOxford Posted January 6, 2023 Author Report Share Posted January 6, 2023 No, Tommy, still got orig. equip. Solenoid's still good, just trying to figger relays out. Got '83 FSM, but 85's considerable different. Thanx. 1 Quote Link to comment
Seven Two Oh No Posted January 7, 2023 Report Share Posted January 7, 2023 Dwayne, I've got an electronic copy of the early '86 (pre-hardbody) FSM I can send you. Should have what you need for the '85 1 Quote Link to comment
datzenmike Posted January 7, 2023 Report Share Posted January 7, 2023 On 1/4/2023 at 4:48 PM, DwayneOxford said: '85 720, 2400 eng., auto trans, std. cab. Orig. prob, no fire to fuel shut off solenoid, couldn't idle. Solved by baring spot on red solenoid wire and soldering un-needed choke heater wire to it. Runs OK now, key switch wont kill ignition. Unplugged the black relay that's with the fuel pump control module and a brown relay and it turns off OK. Anybody able to help? That ain't right. There should be no power to the choke heater with the ignition off, and besides it's only the idle cut which cut fuel to the idle circuit. If it keeps running then the ignition is still on causing spark to the plugs. '85.... does it have a 2 wire or 6 wire electrical plug at the back of the carburetor? There were two carburetors available. Better to fix the no power to the idle cut. 1 Quote Link to comment
DwayneOxford Posted January 7, 2023 Author Report Share Posted January 7, 2023 Not knowing where FSO relay is, having fire to un-needed choke heater, I jumped it to FSO wire. It's the 6 pin connector. I unplugged the black relay that's with the fuel pump control module and a brown relay and it runs and turns off OK. Quote Link to comment
DwayneOxford Posted January 7, 2023 Author Report Share Posted January 7, 2023 2 hours ago, Seven Two Oh No said: Dwayne, I've got an electronic copy of the early '86 (pre-hardbody) FSM I can send you. Should have what you need for the '85 PLEASE do. easyo2003@yahoo.com. Unless you know a better way. Quote Link to comment
datzenmike Posted January 7, 2023 Report Share Posted January 7, 2023 21 minutes ago, DwayneOxford said: Not knowing where FSO relay is, having fire to un-needed choke heater, I jumped it to FSO wire. It's the 6 pin connector. I unplugged the black relay that's with the fuel pump control module and a brown relay and it runs and turns off OK. This is the dreaded feedback carburetor. It's half way between carburetor and EFI. 1 Quote Link to comment
DwayneOxford Posted January 7, 2023 Author Report Share Posted January 7, 2023 3 hours ago, Seven Two Oh No said: Dwayne, I've got an electronic copy of the early '86 (pre-hardbody) FSM I can send you. Should have what you need for the '85 PLEASE do. easyo2003@yahoo.com. Unless you know a better way. Quote Link to comment
Thomas Perkins Posted January 7, 2023 Report Share Posted January 7, 2023 (edited) I got the 85 FSM..I will get it out and check it out.If I can I will find it and send pictures.I know nothing about stock Carbs,just Weber's. Edited January 7, 2023 by Thomas Perkins 1 Quote Link to comment
DwayneOxford Posted January 7, 2023 Author Report Share Posted January 7, 2023 1 hour ago, datzenmike said: This is the dreaded feedback carburetor. It's half way between carburetor and EFI. Yup, the last gasp carb. It works well, has to be REAL cold to need choke. Hoping the FSM from Seven Two Oh No has info I need. Quote Link to comment
DwayneOxford Posted January 7, 2023 Author Report Share Posted January 7, 2023 12 minutes ago, Thomas Perkins said: I got the 85 FSM..I will get it out and check it out.If I can I will find it and send pictures.I know nothing about stock Carbs,just Weber's. All I need is relay ID/locations. Quote Link to comment
Thomas Perkins Posted January 7, 2023 Report Share Posted January 7, 2023 (edited) I am Eating.I will take some pics shortly and send them.Ok, I will send them. Edited January 7, 2023 by Thomas Perkins 1 Quote Link to comment
Thomas Perkins Posted January 8, 2023 Report Share Posted January 8, 2023 (edited) Edited January 8, 2023 by Thomas Perkins 1 Quote Link to comment
Thomas Perkins Posted January 8, 2023 Report Share Posted January 8, 2023 (edited) I retook some with my phone,way clearer,but I have to load them to Imgur,but it somehow doesn't load them to from my phone.It loads them super fast from my computer but I use my blurry camera.Is this what you need,if not I will take more pics.The FSM is not a real detail picture book showing from the actual motor or other detail pictures,just written out diagrams.Too me not a very good book.The other book's show you real pictures of our vehicles.Better to see the actual place and actual parts or relays.Book smart is so-so,but hands on and to actually see is the best.At times the pictures in the FSM is not the same as they really are.They use short cuts.The FSM book's are a short cut book.My Haynes is a better detail manual.It show's actual pictures of our 720's,not just diagrams. Edited January 8, 2023 by Thomas Perkins 1 Quote Link to comment
DwayneOxford Posted January 8, 2023 Author Report Share Posted January 8, 2023 6 minutes ago, Thomas Perkins said: I retook some with my phone,way clearer,but I have to load them to Imgur,but it somehow doesn't load them to from my phone.It loads them super fast from my computer but I use my blurry camera.Is this what you need,if not I will take more pics.The FSM is not a real detail picture book showing from the actual motor or other detail pictures,just written out diagrams.Too me not a very good book.The other book's show you real pictures of our vehicles. 28 minutes ago, Thomas Perkins said: Don't look to be a relay for the fuel cut solenoid. Wonder if the EFC main relay works it or straight off keyswitch?? 5 hours ago, Seven Two Oh No said: Dwayne, I've got an electronic copy of the early '86 (pre-hardbody) FSM I can send you. Should have what you need for the '85 PLEASE do. easyo2003@yahoo.com. Unless you know a better way. Quote Link to comment
DwayneOxford Posted January 8, 2023 Author Report Share Posted January 8, 2023 4 hours ago, Seven Two Oh No said: Dwayne, I've got an electronic copy of the early '86 (pre-hardbody) FSM I can send you. Should have what you need for the '85 PLEASE do. easyo2003@yahoo.com. Unless you know a better way. Quote Link to comment
Thomas Perkins Posted January 8, 2023 Report Share Posted January 8, 2023 (edited) Dwayne,When you have your engine running,disconnect the idle cut off solenoid,if engine does not cut off,then your idle cut off solenoid is bad.Or be a Trump supporter and get a Weber....Yesterday was our Jan. 6 Anniversary,but Webers cost a lot now..Our Governor here in Georgia is giving us free money again.We have a 6.6 billion dollar surplus...We keep it Red,for the working people...Read this,,,,https://www.usnews.com/news/best-states/georgia/articles/2023-01-05/kemp-and-lawmakers-to-decide-plan-for-6-6b-in-surplus-cash Edited January 8, 2023 by Thomas Perkins Quote Link to comment
Seven Two Oh No Posted January 8, 2023 Report Share Posted January 8, 2023 @DwayneOxfordCheck your DMs - just sent a link Quote Link to comment
Thomas Perkins Posted January 10, 2023 Report Share Posted January 10, 2023 (edited) How to fix all the stock 720 carbs.It will make all your carb problems go away forever...No manual needed again...Approved by Nissan World Wide... Edited January 10, 2023 by Thomas Perkins Quote Link to comment
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