Carb gas pipes routing

Scottie1 · October 21, 2018, 10:01:31 AM

I have just recently got a FJ1200 1986 and took the tank off and found a pipe wasn't connected. It's from the carb on the left side looking down . Has anyone any idea where this goes please.

Scottie1 · October 21, 2018, 10:36:15 AM

Quote from: Scottie1 on October 21, 2018, 10:01:31 AM
I have just recently got a FJ1200 1986 and took the tank off and found a pipe wasn't connected. It's from the carb on the left side looking down . Has anyone any idea where this goes please.

.Also the bike starts with starter fluid and I feel a vacuum coming from the carbs but no gas is reaching the carbs. Any input would be greatly appreciated.

Old Rider · October 21, 2018, 11:08:49 AM

That is the vacumline it connects under the tank at the petcock if it is disconnected fuel does not flow.

FJmonkey · October 21, 2018, 11:09:52 AM

The hose is a vacuum line that goes to the petcock. The vacuum from the intake opens the petcock to fill the carbs. Pull that hose off the intake and connect it to the petcock. Then put the tank in place and connect the fuel line to the carbs. Then perform the suck test. Suck on that vacuum line. It should feel like a plugged hose. If you can suck any air through then you have a failing/failed petcock. The more air you can suck, the less likely you will get enough fuel to the carbs.

Pat Conlon · October 21, 2018, 11:32:11 AM

Yep, this vacuum line *was* connected but when you pulled the tank off the bike you inadvertently pulled the vacuum line off the petcock.
No biggie.
Here's the vacuum port on the petcock where you reconnect the line.

Take a moment *now* and safety wire the fuel outlet elbow on your petcock.
Really, it's very very important that you do this: http://www.fjowners.com/index.php?topic=3265.0

Cheers. Pat

Old Rider · October 21, 2018, 11:40:24 AM

You may also have a problem with your fuel line .Im thinking that the fuelline will get kinked an give fuel starvation. Take a look at the airfilterbox and see how its routed your looks to short.

Pat Conlon · October 21, 2018, 12:53:32 PM

Good point Old Rider, proper fuel line routing on the vacuum petcock FJ's ('84-87) is most important.
The single line leaving the petcock should run *under* the 2 branch lines that goes to the carbs.

Also, I am not a fan of the electric reserve petcocks used on the '86/87 FJ's. IMHO the reserve function is dangerous. Passing a line of cars and then, at a critical moment, have your bike suddenly start sputtering is not my idea of safe....but that's just me.
I suggest a change to the simpler non reserve 84/85 petcock...just a suggestion, it's plug and play.
http://rpmracingca.com/proddetail.asp?prod=M%2FC%3A36Y-24500-01
You already have a fuel gauge, low fuel light and an odometer, do you really need a stupid reserve switch?

Speaking of reserve, Scotty if you have less than 1 gallon in your tank, check to make sure you have your reserve switch set to reserve.

Welcome Scotty! Pat

Scottie1 · October 21, 2018, 02:09:45 PM

Quote from: FJmonkey on October 21, 2018, 11:09:52 AM
The hose is a vacuum line that goes to the petcock. The vacuum from the intake opens the petcock to fill the carbs. Pull that hose off the intake and connect it to the petcock. Then put the tank in place and connect the fuel line to the carbs. Then perform the suck test. Suck on that vacuum line. It should feel like a plugged hose. If you can suck any air through then you have a failing/failed petcock. The more air you can suck, the less likely you will get enough fuel to the carbs.

I pulled off the vacuum line from the carb and connected the other end onto the petcock and all I got was air and it was easy to suck. Some I guess I need a new petcock. Thank you for your help

Scottie1 · October 21, 2018, 02:11:30 PM

Quote from: Old Rider on October 21, 2018, 11:40:24 AM
You may also have a problem with your fuel line .Im thinking that the fuelline will get kinked an give fuel starvation. Take a look at the airfilterbox and see how its routed your looks to short.

The previous owner took out the air box and had put some foam filters on. I'm guessing that's why in the picture the fuel line is short.

Scottie1 · October 23, 2018, 03:21:27 AM

Quote from: Scottie1 on October 21, 2018, 10:01:31 AM
I have just recently got a FJ1200 1986 and took the tank off and found a pipe wasn't connected. It's from the carb on the left side looking down . Has anyone any idea where this goes please.

Thank you all for your help. it looks like the petcock is failed so i ordered a new one from RPM. The bike started with a drip feed to the carbs.

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Carb gas pipes routing