SOURCE: 89 fzr 1000 fuel pump problem
It seems likely that your fuel pump is not operating, you should hear the fuel pump priming when you turn on the ignition, if not the fuel pump is at fault, this is not uncommon and a replacement is the answer.
SOURCE: does the xvs 125 dragstar
It's a vacum fed pump. When in the 'on' position the pump will only feed fuel to the engine when the engine is running. However, when switched to the 'prime' position the pump allows a free flow of fuel to the carb. An owners manual can be found on the Yamaha owners club forum. Hope that helps.
SOURCE: carburetor does not let fuel to engine
check the fuel lines and filters for blockages Remove and check all fuel filters located in the fuel line and in the carburetor. Replace any and all filters that can not be confirmed good or have not been changed recently.
Inspect the fuel lines for leaks or kinks that might interfere with fuel flow.
Tap the top of the carburetor lightly to free a stuck needle valve or float that may be shutting off fuel to the carburetor float bowl.
Check the fuse marked fuel pump in the fuse box for any electric fuel pump equipped vehicles.
Connect a fuel pressure gauge to the Shrader valve if the vehicle has an electric fuel pump. Turn on the key and monitor the fuel pressure, it should be around 60-psi.
If equipped with a mechanical fuel pump, remove the fuel line to the carburetor and connect a fuel gauge to the fuel pump. This should yield a low pressure, under 20-psi when the engine is cranked over.
Check the mechanical fuel pump by placing a fuel line into a gas can and attach the other end to the intake of the fuel pump.
Crank the engine and check for fuel at the carburetor. The engine may start with fuel from a remote source such as a fuel can. If the pump draws fuel from the can and not the tank the tank screen must be inspected and or replaced. This would require removing the gas tank. hope this helps
Carb. engines on bikes are usually gravity fed. Just follow the fuel line from the tank to see where it ids distributed to your carbs.
Sticky float valves and bad diaphragms will cause the carb to flood out. Ethanol gas could be the problem where it's eating away at the rubber parts. I suggest if you're not a bike mechanic, then get it to the shop where your carbs can be rebuilt using ethanol safe components and have them synchronized. Your bike will run better than it ever has.
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