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I am new to snowmobiles so please bear with me. I recently bought an 89 Jag 440 from a buddy's buddy. I only paid $100 so I wasn't expecting much. After cleaning the carb very thorough and replacing the fuel pump along with all the gas lines it will only pump fuel with your hand over the back of the carb. Is this just because I bought a cheap pump or is there something else that is causing me to lose suction? Thanks in advance for any advice. I also bought a 97 summit 670 but that's another story...
 

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Most likely you are not getting enough vac/pulse from the crank case to the pump?
Check the pulse hose may be collapsed?
 
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