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Have 1980 artic cat panther rebuilt fuel diaphragm pump last winter and had to fill fuel lines every time to get it going. this year filled up lines with fuel and it will run till that fuel is used up but will not pull anymore out of tank. Replaced all fuel lines and vacuum line. Put finger over vacuum line while sled was running and it had a little suction. Do you think I need to rebuild fuel pump again or what.
 

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Find your tanks vent line (by clutch?)
Simply blow into it with cap on and fuel lines off, till you get gas out
Then with the plugs out if you want, pull it over and see if the pump is working
 
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