How do you get air out of a motorcycle fuel line?

Question

The motorcycle is brand new.
The fuel tank is BELOW the carb..

Motorcycle is brand new, and has NEVER started...

Answer 1

motorcycles have a gravity fed fuel system. It's unlikely that air in the line is your problem (but may be a symptom of another problem). Any air bubbles should burp themselves to the fuel tank without incident.

If you have a hole in your fuel line your fuel should be leaking out, not air leaking in. There would need to be a negative pressure in the fuel line to suck air in, otherwise the gravity pressure from the fuel tank should be forcing fuel out...air would be coming in from the top of the tank to equalize pressure.

Chances are if you suspect you have air in your fuel line, it is because your fuel flow is obstructed by debris in the tank, in the line, in the shutoff valve, or in the carburator. To eliminate, disconnect your fuel line from the carb and see if you get fuel leaking. If you do, the obstruction is in the carb. If no fuel comes out, clean out the tank and replace the line with standard fuel line from the parts store (like 50 cents a foot or less).

Unfortunately cleaning out the carb on motorcycles takes a good deal of know how. It can be done my a mechanically minded DIY. Tanks and fuel lines can be cleared easily at home.

Please don't take this the wrong way, but not knowing your experience level with bikes, the answers above assume that you have gas in the tank, the fuel shutoff valve is turned on, and there is no fuel filter obstruction (if your bike even has a filter).

Answer 2

Motorcycle Fuel Line

Answer 3

If the tank is below the carb then it must use a fuel pump of some sort. Unless the system is a closed pressurized system, there will always be some air bubbles in the line. Does the bike run ok? If so, don't worry about it.

If you only have air in the line, or if you get air in the line after stopping, then you have a bad check valve that allows the fuel to drain back into the tank. A loose fitting or hose clamp, or a hole in the line will also allow air in, but you should see fuel leaking out also.

Your problem could range from being no problem to being a bad fuel pump. A little detective work should sort it out in no time.

Answer 4

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RE:
How do you get air out of a motorcycle fuel line?

Answer 5

how old is the motorcycle? Older bikes have a bowl next to the carb that has a drain plug. Newer bikes , the bowl is in the carb so you unhook the fuel line from the side of carb. But if you have gas in the tank, gravity will remove the air for you. it will bubble up thru the line.

Answer 6

If it runs good don't worry about it. They all get a little air in the lines sometimes. It goes away when the fuel starts running. It's not a pressurized system or anything. The carbs are vented.

Answer 7

With a full tank, disconnect the lowest point in your fuel system. Usually where the fuel enters the carburator and drain some of the fuel in your tank into a gas can.

Answer 8

Always give year, make, engine size and model # when asking questions. We need all of that info to give an informed answer.

Answer 9

Replace it with a line without a pinhole in it.

Thats more than likely your problem.
replace all the lines - - CHEAP TO DO

Answer 10

Cheap way....

Ram it ,dry it

till your fuel tank it dry and out of fuel.

that my personal idea.

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