Can anyone tell me where the vacuum line from the tank runs to on the 88 Hurricane? I have looked all over and can not figure out where it goes!

Also, if the petcock is in the reserve position does it need vacuum to feed fuel to the pump

Thanks

Info Much appreciated

John

 

vacuum needed for petcock for 89 > 99 petcocks

 

I had a petcock once.............................................. ................................then I got married

Cheers, SB

 

And now, your wife's got one instead.

 

Pardon there is no vacuum line from the fuel tank only an overflow from the filler and a breather to allow the tank to release the fuel (ask the guys who have had a problem with the breather tube inside the tank blocking and you'll find out what a problem that is).
The overflow is the stub that drops out of the tank above the funnel shaped rubber that has a hose that exits below the motor.
The smaller stub that connects to a hose is the breather this also goes to below the motor and may have a filter plug on the bottom end or may not,depends if it has blocked and been thrown away.
87 & 88 have fuel pump which draws through a filter to the pump then to the carbs. The fuel tap ( or Pet **** as TK calls it) is just a 3 position valve with Off Run & Res and does not require vacuum to operate as do the later gravity feed versions.

 

Ah messed up - meant none needed for the 87 88 but needed for the 89 > 99 .....

tut tut tut - lol

actually JK I have two line (not vacuum tho) one for the overflow , one for the tank
breather on mine

 

Thanks guys that answers I won't worry about that anymore.

One more question. Any ideas why bike would Syphoning gas into engine if the gas isn't turned off when parked.

Would that be plugged tank vent.
?

Thanks again

 

Hey John,

Be very, very careful if your cylinders are filling with petrol. Spin the starter and the piston hits an uncompressable fluid = hydrolock = bent conrod possibly.

I expect Sprock, Naga, Shadow or other extremely experienced CBR1000F owners to pull me up here if I'm wrong but I would say your fuel tap/petcock is leaking.

This was a common occurence in my other bike (GTR1000 Kawasaki) which also had a vacuum actuated petcock and all sorts of 'fixes' were offered - the best and most reliable of which was buy a new one. Some can be rebuilt, and we also used to put excess fuel drain tubes (above the fuel float height) - haven't heard that done for the CBR though. But I'm new here.

Cheers, SB

 

Well easiest way to check the 87 88 petcock is to simply pull the line off
when it's in the off position - the result will be self evident.

In any event I'd say you have a sticking float valve probably with a flake
of rust or crud in it.

Time to pull the carbs and clean.

Quick fix that might work lightly tap the carbs with a hammer
with the petcock in the on position and the motor running
- might be enough to get the stuck valve - to unstick

Failing that - no choice but to pull the carb's and thoroughly
clean and install a new inline filter

 

JohnG,

As mentioned, your bike does not have the auto off petcock like the mk2 & mk3 bikes. On those bikes, due to the lack of vacuum when the bike is turned off, the petcock closes the flow of fuel to the carbs.

On your bike you will need to turn the petcock to off after riding.

Some bikes, when the float level is in the high range, will let fuel flow when the bike is tipped on the side stand. Try the center stand and see if the problem still occurs. If so, the float needle or needles may be letting fuel in the carbs at a low rate even thou the bowl level is correct.

As Quoted from Sprock....Quick fix that might work lightly tap the carbs with a hammer
with the petcock in the on position and the motor running
- might be enough to get the stuck valve - to unstick

I have had to do this on a few bikes, but you never know when it's going to leak again. It does give you a good idea of what's going on.

It would be best to simply turn the fuel off when the bike is not running and know that your fuel has not run out while you are out for dinner.