95 CBR900RR Fuel Tank line Problem - Honda Motorcycles - FireBlades.org
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post #1 of 8 Old 06-16-2007, 11:50 PM Thread Starter
 
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95 CBR900RR Fuel Tank line Problem

Hi

Can anyone give me some help on the following weird problem

I bought a 95 CBR900RR a week ago runs great ride it home no problem

I notice the rubber spacers between tank and frame are missing when i start looking over bike and tank is a little wobbly

So I order them Put them on yesterday never took tank off just removed top bolt by steering head to lift tank up so slightly

Bike has not been started all week
Today i go to start it and runs fine for a minute or two then begins to starve itself for fuel, eventually dies and I try to restart and it wont start

I pull tank off to see if i can find out what is wrong

Notice there are three lines from tank

1 from fuel petcock to carbs
1 from tank to a tube that vents to atmosphere
and a smaller one that looks like it should be for vacuum to carbs to get fuel flowing once bike is being started and is running

This line is connected at tank but is not connected to anything else

I look around and cant see where it is supposed to go

I look at bottom of each carb boot and notice there is a brass plug with a rubber cap on it for #1 cyl all other cylinders have allen bolts in there

I am stumped as to did i pull line off somewhere while i was playing with tank installing those rubber spacers

Anyways I decide to pull the rubber cap off the brass fitting on #1 cyl and hook the small line to it

Put bike back together and turn fuel petcock on after a few seconds bike fires up and is running fine

Am I missing something as to where this line should really go to ?

Did I leave a vacuum port unplugged somewhere else??

Any thoughts,help,suggestions would be greatly appreciated


George
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post #2 of 8 Old 06-17-2007, 12:41 AM
 
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Re: 95 CBR900RR Fuel Tank line Problem

I don't have a 900rr nor have I worked on one. It does sound like you have a vacum line open somewhere. The brass nipple, where others are allen bolts is where you do a carb sync from. Look around under the tank and see if you can find the lost vacum connection, as where you pulled off a cap is not where the third rubber line connects.
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post #3 of 8 Old 06-17-2007, 1:38 AM
 
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Re: 95 CBR900RR Fuel Tank line Problem

l;./////> dohhh the new kitten won't let me type!

Ok the two small lines are just vent and overflow. not vacuum. They just open to atmosphere below the bike.

The ON position on the fuel selector knob only works for the first 4 gallons of fuel in the tank. The last .75 gallons or so will ONLY get to the carbs if the selector knob is turned to RESERVE.

Try that and get back to us.
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post #4 of 8 Old 06-17-2007, 3:48 AM
 
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Re: 95 CBR900RR Fuel Tank line Problem

What capacity is it...893cc or 918cc?

You said there is only one line coming off the petcock?

If you have a true 95 model George, your 95 does not have a vacuum operated petcock. That feature was a part of the 96+ Fireblade.

Then again, it might be a 96 model made in 1995. Easy way to tell. See the main frame....see the triangle section on the main frame under the fuel tank? Does the triangle 'end' at the rearmost part of the fuel tank, or does it end underneath the tank with a little bit of the subframe square tubing going under the tank connecting to the frame?

As Fastrr said, it might be that your fuel level is too low and you had it set for the main tank, or maybe the petcock selector wasn't fully open?
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post #5 of 8 Old 06-17-2007, 10:07 AM Thread Starter
 
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Re: 95 CBR900RR Fuel Tank line Problem

Hi

Thanks for all your input It is really appreciated

The model year of the bike is 1995 (sticker with model year and VIN in big letters is still on frame)and I am inclined to agree that it is only a vent tube

Frame ends right at rear of tank

This is weird

There was not much fuel in tank and what is there is left over from when I bought bike.
Also bike has been sitting for a while

gas does not smell right

It doesnt smell like varnish yet but I think i will drain it

I tried to open petcock while tank was off and there was no fuel coming out and that was my reason for the vacuum issue
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post #6 of 8 Old 06-17-2007, 2:56 PM
 
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Re: 95 CBR900RR Fuel Tank line Problem

remember to put that vacuum cap plug back on the engine where it came from.

If you can, buy some SeaFoam fuel/engine cleaner, poor a couple ounces of that in an almost full or full tank of fresh gas. The stuff works great and won't harm anything. Just don't put more than 2 ounces in.
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post #7 of 8 Old 06-17-2007, 10:39 PM
 
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Re: 95 CBR900RR Fuel Tank line Problem

And from what I hear with the seafoam.....wait for the clouds of smoke!!
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post #8 of 8 Old 06-17-2007, 10:41 PM
 
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Re: 95 CBR900RR Fuel Tank line Problem

Quote:
Originally Posted by gmly View Post
There was not much fuel in tank and what is there is left over from when I bought bike.
Well, if you had the petcock set to the 'on' position and the tank was at the 'reserve' level, that would explain why the bike wouldn't start.
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