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Old 12-26-2011, 06:36 PM   #1 (permalink)
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Working on a friends 800,last spring we changed handle bars with another kill switch.And changed all fuel lines and fuel filter it seemed to run good.With the exception of hand warmers didnt work.
Now this year it wouldnt start unless we poured fuel into cylinders,after three or four times of that it finally ran on its own,but only on 2 cylinders.we were looking at fuel lines and there is alot of air in the lines with the gas. thinking that fuel pump is going out,not getting enough fuel..does a fuel pump get weak or just go out.or look else where???
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Old 12-26-2011, 06:55 PM   #2 (permalink)
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Click on link below, I have seen this many times.

A Pre-season Must For All Carbed Sleds, All Makes And All Models - ArcticChat.com - Arctic Cat Forum
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Old 12-26-2011, 09:17 PM   #3 (permalink)
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Always start on the easy item.Do you have spark?? With lot of bubbles in the fuel line, obvoiusly means that you maybe sucking air. Your fuel pump may be on its way out. Check the fuel lines on the fuel pump along with the crank case pressure line. It will be right under the carbs, next to the oil pump. Make sure it is on. If you don't have vacuum, you won't have fuel.
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Old 12-26-2011, 10:29 PM   #4 (permalink)
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All fuel lines were replaced last year with proper tubeing...
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Old 12-26-2011, 10:53 PM   #5 (permalink)
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All fuel lines were replaced last year with proper tubeing...
Even the one inside the tank?
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Old 12-27-2011, 05:19 AM   #6 (permalink)
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yes even the one inside of tank.
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Old 12-27-2011, 09:49 AM   #7 (permalink)
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Quote:
Originally Posted by F7 Rookie View Post
Working on a friends 800,last spring we changed handle bars with another kill switch.And changed all fuel lines and fuel filter it seemed to run good.With the exception of hand warmers didnt work.
Now this year it wouldnt start unless we poured fuel into cylinders,after three or four times of that it finally ran on its own,but only on 2 cylinders.we were looking at fuel lines and there is alot of air in the lines with the gas. thinking that fuel pump is going out,not getting enough fuel..does a fuel pump get weak or just go out.or look else where???

You can test it with a vacuum gauge. Disconnect the fuel line from the fuel pump inlet and connect a vacuum gauge to the fuel pump inlet. Be sure the float bowls are full and run the engine between 2000-3000 rpms for 30 seconds. You should get a vacuum reading between 7 and 10" of vacuum. What is the condition of the impulse lines? Have they been replaced with 3/16" line?
If you don't find anything there check for carb problem, crank seal, or base gasket problem.
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Old 12-27-2011, 10:36 AM   #8 (permalink)
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Then your fuel pump is bad, The air charge from the pulse side is getting into the fuel side of the pump causing your air bubbles
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Old 12-27-2011, 11:02 AM   #9 (permalink)
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I had a stock fuel pump go bad on me...
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Old 12-27-2011, 12:44 PM   #10 (permalink)
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Make sure it has over a 1/2 tank to rule the pickup out
The blue fuel line has a natural curve to it and can stick out
of the fuel inside the tank
I always take and heat the line to get the curve out and make it lay flat
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