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Old 05-17-2009, 06:06 PM   #1
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Default Air in fuel line

Hey guys I keep picking up air in the fuel line it will be ok for a little bit then the idle starts surging and really leans out I'll look down and there are air bubbles in the line before the carb. Is a bad pickup in the tank the only thing that will cause this? I've changed the fuel line several times and this does not help. This is my first nitro anything and of course I can't come close to tuning it this way.
If it is the pick up is replacing the tank my only option

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Old 05-17-2009, 08:26 PM   #2
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a couple things can cause this. 1. your tank isn't sealing shut when closed all the way. 2. pin hole in your fuel line. 3. Dirt, or a slight obstruction in the nipple where the fuel line attaches to your carb 4. this one is far fetched, but your exhaust pipe could be damaged internally, and your back pressure is getting messed with. I had an o.s. 2050 pipe, and the inner cone came loose, and cause erratic characteristics such as your talking about.
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Old 05-17-2009, 08:44 PM   #3
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Hi thanks for the reply

I have ordered a new fuel tank to eliminate that portion. Thanks for the tip about the pipe. On the cen r2 it is a composite pipe with an o ring in the middle where the two halve join so you have given me some new areas to check if the new tank doesn't fix the problem

Thanks again

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Old 05-23-2009, 06:18 PM   #4
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Just a quick follow up

I replaced the tank the first thing I noticed: I had to blow much harder on the pressure tube to get the fuel line to prime I took this as a good sign. After getting her started up the idle was much to fast, I was able to adjust it and actually see a change. After getting the idle where I thought it should be I was able to do some small adjustments on the HSN and see improvements I was able to drive it around for half a tank making small adjustments and have them work. Nice to have a non surging leaning out beast. The future for this car looks brighter now

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Old 05-23-2009, 07:12 PM   #5
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Thanx for the follow-up. Always nice to hear how the problem gets solved. That leaves info for us readers.
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