What's this green plug for?

[86FJNJ]

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.

[86FJNJ]

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!

[Pat Conlon]

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.

[86FJNJ]

Thanks Pat. Is it possible to use that green plug to wire up a fuel pump as the power source on my gravity fed

[Pat Conlon]

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

[86FJNJ]

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?

[Pat Conlon]

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...

[86FJNJ]

Ok, how do I short it? Sorry I'm a newbie

[Dads_FJ]

Or... stick a volt meter on it and start pulling fuses until you lose voltage.

[86FJNJ]

Thanks I'll try that

[86FJNJ]

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

[FJmonkey]

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. 

[86FJNJ]

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

Pat, the description for this safety switch says it has a 7.5amp fuse built in, would that be an issue if the fuel pump takes a larger 15a or 20a fuse? I found a 20amp in line fuse that I purchased that I'm thinking I can use this for the fuse but still need to sort out the safety aspect if I can't use the switch you sent.

https://www.mikesxs.net/yamaha-xs650-mini-fuse-holders.html?fits-motorcycle=Yamaha/FJ1200/FJ1200W/1989

[Pat Conlon]

I'm out of town so I can't check the FJ circuit size (amps) that feeds the FJ fuel pump... perhaps others can chime in.

My instincts tell me that 7 amps could provably be ok for the low volume low pressure FJ fuel pump.

If the aftermarket fuel pump safety switch comes with a 7 amp fuse, I suspect a change (if needed) to a 10 amp fuse would be no problem.

Cheers

Pat

[86FJNJ]

Thanks Pat, if for some reason I can't use that safety switch what about wiring in one of those safety switches that jet skis have where you put the pin in and connect it to yourself and if you get thrown off it pulls the pin and shut everything down? Probably annoying to deal with on a regular rider but for a bike I plan to take locally to work and back probably not that much of an annoyance?