Fuel not going into the carburetor

[Gustaf]

I can only get my GZ250 started if I put the fuel switch into PRI position for at least 5 seconds.

Then it runs for a couple of minutes, starts sputtering, and stops. It will not get started unless I put it into PRI again.

My motorcycle has been in storage for a while, but I was able to get it started without any problems a couple of months ago.

I added new fuel, the engine sounds better now, but the problem persists.

Any suggestions will be much appreciated.

Thank you,
Gustaf

[blaine]

Welcome to the forum.Add some Sea Foam or Berrymans b12 to your fresh fuel and it should help.You should always put some in the tank before you store your bike.Also the tank should be full of fuel when storing,to prevent rust.
:) :2tup:

[Gz Rider]

...

[mole2]

Don't forget fuel stabilizer for long term storage as well

I don't know why people just don't put Stabil in the fuel at every fill up. You only use about 2 oz and it avoids many problems. It'll help keep the fuel system clean, avoid ethanol problems and, if you should happen to not be able to ride for a few weeks for some reason, will avoid the gum up problems. I put Stabil in my gas cans for the lawn equipment, my boat, my truck (which I use rarely) and my bike. I've done this for as long as I can remember. It's cheap insurance. Due to a back problem I had my boat laid up for a over a year and when I could take it out again it started right up and the 85 gallons of fuel were fine. Think of the money you can save on Seafoam, Berrymans and the time and aggravation lost. :tup:


:)

[alantf]

It will not get started unless I put it into PRI again.



This points to a lack of vacuum. "prime" is just an on/off switch. "run" uses the engine vacuum to open the valve, & let fuel flow. This is a safety device to make sure that fuel will not flow when the engine is shut off. First step is to check all the vacuum hoses from the petcock to the engine etc. Check that they're all there, tight, no holes, not been chewed by vermin while the bike was stored. Bet that you find the answer right there. :2tup:

[Water Warrior 2]

Good observation Alantf. You're making the rest of us look bad. Should have been the first thing to come to mind.

[Gz Rider]

...

[blaine]

The vacuum hose has no clamp on it. :cool: :)

[Water Warrior 2]

The vacuum hose has no clamp on it. :cool: :)
Yup, it's a press fit. If the hose has dried out it will probably be porous and not create a negative pressure.

[Gz Rider]

...

[jonathan180iq]

This points to a lack of vacuum. "prime" is just an on/off switch. "run" uses the engine vacuum to open the valve, & let fuel flow. This is a safety device to make sure that fuel will not flow when the engine is shut off. First step is to check all the vacuum hoses from the petcock to the engine etc. Check that they're all there, tight, no holes, not been chewed by vermin while the bike was stored. Bet that you find the answer right there. :2tup:

Ditto

[Gustaf]

Thanks everyone.

I added some Sea Foam to the fuel, and now the bike will run for longer after a couple of seconds in PRI position, but it still dies.

Found the vacuum hose - what should I be looking for in it?

[blaine]

Thanks everyone.

I added some Sea Foam to the fuel, and now the bike will run for longer after a couple of seconds in PRI position, but it still dies.

Found the vacuum hose - what should I be looking for in it?One end fits on carb,the other end fits on back of petcock.
:cool: :)

[5th_bike]

It should hold a vacuum in it, between the carburetor and the fuel valve.
Well not really a vacuum, more like a little negative pressure. Its suction opens the fuel valve when it's on ON or RES.
If it is leaky or brittle: replace.

[Gustaf]

OK, I have been stupid. Its not enough to find the vacuum hose, it has to be connected on both ends. It got disconnected somehow. I plugged it back and and the motorcycle starts instantly.

Now I will just have to monitor it just to make sure its own securely.

Thank you all.

[Rookie Rider]

Gustaf dontchya just love this forum ?