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Air in the fuel lines

Air in the fuel lines

Old 06-10-2009, 01:33 PM
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Default Air in the fuel lines

The motors in my truggy and buggy have been very difficult to tune as of late. I've notice a lot of air bubbles in the lines. I've replaced all of the fuel tubing and the tanks but the problem persists. I'm at a loss to figure out where it's coming from.

The buggy motor is a VSpec and the Truggy is a 427.

Any ideas?

Edit...I also noticed that the silicon gaskets between the two pipe pieces were tearing so I picked up some new ones but have yet to change those.
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Old 06-10-2009, 03:00 PM
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are you using any external filters?
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Old 06-10-2009, 06:17 PM
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Originally Posted by unsp0ken View Post
are you using any external filters?
+1, check your filters to see if the bubbles are appearing after it. If so, then more than likely the rubber Oring on the filter is no good or it's not down enough. If the air bubbles are before your filter, then you might want to change your tank. It maybe that the tank has a leak in the fuel pick up area closer to the top of the tank so thats where the air is coming from. Good luck.
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Old 06-10-2009, 06:40 PM
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no filters
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Old 06-10-2009, 11:37 PM
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Dont screw the fuel tank screw too tight.......
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Old 06-10-2009, 11:59 PM
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If you've changed the tank, then you might want to try a small zip tie on the fuel line that goes over the nipple. Running out of ideas, but this is another possibility. If the fuel line goes on the nipple easy, then it could be loose, even if it's tight, try a small zip tie on it and see if it gets rid of your problem.
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Old 06-11-2009, 03:32 AM
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I have been through 6-7 rc8 fuel tanks and it was the pick up. I also believe you have a vibration problem, to check that,remove the tank but keep the fuel lines attached and let it run at idle and look for bubbles.
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