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General Category => Maintenance => Topic started by: 86FJNJ on April 05, 2025, 09:40:01 AM

Title: What's this green plug for?
Post by: 86FJNJ on April 05, 2025, 09:40:01 AM
86FJ barn find, I didn't disconnect anything from this, the only thing I can think of is something related to fuel delivery?

Anyone know what it's for? I didn't see wiring diagram for 86 in the files.
Title: Re: What's this green plug for?
Post by: 86FJNJ on April 26, 2025, 02:18:52 PM
What is this? What is it for? This part didn't come with my bike but I saw it on ebay and it looked like the green plug from this piece would fit into the green plug in question on my bike so I bought it and it fits perfectly. I asked the person selling it what it was and they had no idea. Would appreciate everyone help here. Thanks!
Title: Re: What's this green plug for?
Post by: Pat Conlon on April 26, 2025, 03:52:17 PM
California FJ's have a special emission system that recirculates gas vapor from the fuel tank. When the engine is off and a vacuum is not present this electric valve routes the gas vapors to charcoal canisters which filter the hydrocarbons out of the tank vapors.
This green plug is on all FJ wiring harness but is only used on California models.
It is an excellent point for a switched 12v power tap.
Title: Re: What's this green plug for?
Post by: 86FJNJ on April 26, 2025, 04:19:03 PM
Thanks Pat. Is it possible to use that green plug to wire up a fuel pump as the power source on my gravity fed
Title: Re: What's this green plug for?
Post by: Pat Conlon on April 26, 2025, 09:01:21 PM
Good question, what size fuse does that plug have?

Don't forget about your fuel pump safety switch
https://www.classicindustries.com/product/re12003.html
Title: Re: What's this green plug for?
Post by: 86FJNJ on April 27, 2025, 09:21:49 AM
Pat, I'm not 100% sure if it's on a fuse. I don't see it connecting directly but if it indirectly connects to a fuse through one of those other junctions then I guess it would be connected to a fuse. I've got no experience reading these wiring diagrams though. If it's not connected to a fuse or the correct size fuse for a fuel pump can't I get some kind of in line fuse?
Title: Re: What's this green plug for?
Post by: Pat Conlon on April 27, 2025, 11:33:07 AM
I'm sure the green plug is on a fuse...but what size? Need to see how many amps you need for the fuel pump. If the green plug has a 7.5 amp fuse, that won't be enough....I would suspect you need at least a 15 amp for the fuel pump...

Short the plug...see which fuse blows...
Title: Re: What's this green plug for?
Post by: 86FJNJ on April 27, 2025, 02:12:07 PM
Ok, how do I short it? Sorry I'm a newbie
Title: Re: What's this green plug for?
Post by: Dads_FJ on April 28, 2025, 07:40:08 PM
Or... stick a volt meter on it and start pulling fuses until you lose voltage.
Title: Re: What's this green plug for?
Post by: 86FJNJ on April 29, 2025, 07:39:20 AM
Thanks I'll try that
Title: Re: What's this green plug for?
Post by: 86FJNJ on April 29, 2025, 12:34:56 PM
If the fuse that's is connected to this plug is not the correct size for the fuel pump can I just add an in line fuse like this?

https://www.amazon.com/gp/product/B0C9V36YHC/ref=ox_sc_act_title_1?smid=A28S1NG428PI94&th=1
Title: Re: What's this green plug for?
Post by: FJmonkey on April 29, 2025, 12:43:26 PM
If you add a fuse, make sure all the wires in that circuit can handle the amps you want to run through it. The fuse prevents the wire from becoming a fire starter.