Gas Problem - - Arctic Cat Forum

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post #1 of 6 Old 01-15-2010, 04:03 PM Thread Starter
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Ok, had this problem last year. starting from right to left sitting on the machine. 1,2 carb has gas going to them, no air bubbles or anything. 3 does not have any gas going to it, the fuel pump is new from last year. It runs on all 3 to start, then kicks down to 2 afterwards, due to the gas not going to the 3 carb. I am pretty sure I have the lines right, I have the main gas line coming from the tank going to the top nipple, the second nipple to 1, the bottom nipple to 2, and the hooked curved nipple on the far side to 3, can anyone verify the gas line set up for me. Thanks
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post #2 of 6 Old 01-15-2010, 04:29 PM
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There should be arrows on the fuel pump showing direction of flow through each nipple. When you blow into the fuel tank vent line do you see the fuel flowing through to each line to the carbs? If fuel doesn't flow from the pump to the PTO carb, then you know the problem is in that pump outlet. The appears to be pumping of middle and MAG carb are still getting fuel. If the PTO carb runs dry after starting then the problem could be in the carb with the inlet needle and seat, or float. Try swapping the carbs to different cylinders to see if the problem follows the carb to the other cylinder.

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post #3 of 6 Old 01-15-2010, 06:39 PM
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i had a problem like this also, mine was fuel filter it didn't look real bad but it wasn't letting enough fuel into the pump to get to all three cylinders so it would only run on two changed it and was just fine. it was $5 and fixed it all

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post #4 of 6 Old 01-15-2010, 08:23 PM
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had this problem with my twin.. you are missing a hose going from the crankcase to the pump. it keeps the pressure to the pump pushing the fuel to all carbs. mine would also lose fuel in the pto side carb as it is the farthest away from the fuel pump. unless you are running an efi this might be your problem
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post #5 of 6 Old 01-21-2010, 08:28 AM
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If the pump looks like this you should have the ones you see..... Bent pipe is the input from the tank , lower front is out and pipe behinde is vacumn from the crankase other two are outlets to each carb should not matter which carbs goto which outlets...
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post #6 of 6 Old 01-21-2010, 10:57 AM
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These guys are correct with what they have told you you may want to also check your fuel line to make sure there is not a small cut in it where it is losing vacuum.

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