Fuelling issue help!!

[Ollieclarkx64]

Wondering if I can get some advice with a fuelling issue I’ve had for a little while now.

The bike runs well gets good spark etc but after running for a little while the bike starts bogging before cutting off completely and not starting for another little while. During this I’ve checked the height of fuel in the float bowl and it seems to drain almost completely and doesn’t refill so I thought it would be stuck float valves but after taking the carbs off and looking all seems good. The pump primes as normal and fuel can get through the system to the carbs but the float bowls just don’t fill up. The pump primes okay, the tank breather is ok, it’s had a new filter since when I first had a fuelling issue I replaced it and the fuel pump which worked for a little while. I also switched out the side stand switch and relay which when tested were faulty but the issue still seems to be there.

I’m thinking maybe I didn’t properly check the tubes that join the carbs together and there’s a blockage there before the float valves but does anyone have any advice, thoughts or ideas on where I should look next.

Thanks

[unfazed]

Bike model and year would be a great help. Check the routing of the fuel pipe, common problem on the 600 is the fuel pipe is people routing the pipe to the tank over the cross rail of the frame kinking the pipe when the tank is down. The pipe should be routed under the cross rail. On the 1000 and 600 a blocked breather in the tank could cause it, try running it with the fuel cap open. Othere issue maybe the fuel tap not fully turned on. On the 600 there is a small inline fuel filter which could be dirty enough to slow the filling of the carbs on the plastic T-piece where the fuel pipe connect to the carbs.

[Ollieclarkx64]

Bike model and year would be a great help. Check the routing of the fuel pipe, common problem on the 600 is the fuel pipe is people routing the pipe to the tank over the cross rail of the frame kinking the pipe when the tank is down. The pipe should be routed under the cross rail. On the 1000 and 600 a blocked breather in the tank could cause it, try running it with the fuel cap open. Othere issue maybe the fuel tap not fully turned on. On the 600 there is a small inline fuel filter which could be dirty enough to slow the filling og the carbson the plastic T-piece where the fuel pipe connect to the carbs.

It’s a 2000 fzs600. I’m pretty sure routing is all ok I followed what I could see in Haynes manual but I’ll try to get some photos soon definitely routed under cross railing tho. Breather and overflow are both clear. I replaced the filter around 2 and a bit months ago and ,having the system disconnected after the filter, fuel seems to flow to that point fine and the pump seems to be priming and clicking normally when the bikes running so I assumed it’s an issue coming from after the pump.

[unfazed]

The filter I was referring is on the fuel rail at the Plastic T-piece

[Ollieclarkx64]

I didn’t even know there was one there ? I bought my bike in pretty rough shape and I’m finding there’s a lot of things missing from it. I realise I misread what you said earlier but I haven’t seen anything like that in the carbs will have to check if there’s one there and what it looks like after I get the carbs off again

[Gnasher]

I have pictures of work being done to my bike, including the head off.  Gnasher.

Wondering if I can get some advice with a fuelling issue I’ve had for a little while now.

The bike runs well gets good spark etc but after running for a little while the bike starts bogging before cutting off completely and not starting for another little while. During this I’ve checked the height of fuel in the float bowl and it seems to drain almost completely and doesn’t refill so I thought it would be stuck float valves but after taking the carbs off and looking all seems good. The pump primes as normal and fuel can get through the system to the carbs but the float bowls just don’t fill up. The pump primes okay, the tank breather is ok, it’s had a new filter since when I first had a fuelling issue I replaced it and the fuel pump which worked for a little while. I also switched out the side stand switch and relay which when tested were faulty but the issue still seems to be there.

I’m thinking maybe I didn’t properly check the tubes that join the carbs together and there’s a blockage there before the float valves but does anyone have any advice, thoughts or ideas on where I should look next.

Thanks

Before you go pulling the fuel system apart.

When did this start, would it be since it's got cold by chance?

If so it's more than likely carb icing.  The Fazer carbs are warmed by the bike coolant the little elbows that go into the carb bodies are very prone to blocking.  All you need do to check is removed the black water feed pipe, have something ready to plug the end with it a small bore about 4mm.  Using a length (approx 100mm) of nylon brisle or such like not steel copper is fine.  Gently poke it through the elbow it should go in about 25mm easily if it bends or is difficult to insert it's blocked.

You need to remove the elbows and clear them.  Removing the crabs is the best way as you can blow out the heater passage in each carb.  While your there check the condition of the cooling system, the coolant should be clean i.e. no rust or very little.