Question on fuel system for a 1970 panther - ArcticChat.com - Arctic Cat Forum

 
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post #1 of 7 Old 01-06-2013, 10:35 PM Thread Starter
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Question on fuel system for a 1970 panther

I was given a couple of old sleds that my grandfather bought new. One is giving me some problems since it hasnt ran in a few years. It is a 1970 Panther 399. I bought another rear fuel tank with two 90 degree elbows on it.

My question is are there supposed to be a pick up tube with filter connected to the bottom of the elbows under the rubber grommets? The only diagrams I saw on line had 1 90 degree elbow on it. If so, which side? I see two fuel lines running to the carb (one green and one red). I imagine one feeds the carb and one is the return. Unknown which is which. I followed some instruction that I found on this website to replace plugs and put some oil down the heads. I did that and it turns over freely when I pull it. the motor is not seized, so that is a plus. It was stored under a covered porch (car port) so I highly dobt rain got into the carb (rain catcher). I learned that term here on this site.

Matt
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post #2 of 7 Old 01-06-2013, 11:41 PM
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Look and see which color line is attached to the bottom of the carb and which one is attached to the top of the pump stack.. That will be the one that needs the pickup line in the tank
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post #3 of 7 Old 01-06-2013, 11:58 PM Thread Starter
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Thanks for the info. The green one goes to the bottom of the carb. Thanks again for the quick reply
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post #4 of 7 Old 01-07-2013, 06:44 AM
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The two lines were a pick up and return to help with vapor lock.
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post #5 of 7 Old 01-08-2013, 08:30 PM
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I was just going to post a similar question to this. I just bought a 70 panther 399. The pickup and return lines in the tank are laying on the bottom of the tank disconnected. Does the pickup like or return get the filter? And does the return line need extra hose in the tank attached to the fitting? Thank you
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post #6 of 7 Old 01-09-2013, 01:13 AM Thread Starter
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People correct me if I am wrong. Only the pick up should be connected and have a filter on it. The pick-up should be the green line on the right side as you are looking at the back of the tank. It goes from the tank to the bottom of the carb stack
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post #7 of 7 Old 01-09-2013, 05:24 AM
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actually the supply line gets a ball/check valve to stop the fuel from flowing back into the tank after the engine is shut off. with out this check valve you would be pulling your guts out to get fuel up to the carb every time you shut the engine off. as far as the return, it doesnt need a line inside the tank.

I will give up my vintage sled when they pry my frozen dead thumb from the throttle......WOT of course!
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