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Old 12-03-2009, 06:30 AM   #1
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Default How to stop air forming in the fuel lines?

Hi I have Rb Concept Rody V12

No matter what I do I get air bubbles in the fuel lines. U tried different length lines and lines going via different routes and still air bubbles form.

It affects the idle and sometimes tune.

How can I avoid this?
Thanks
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Old 12-03-2009, 08:42 AM   #2
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Quote:
Originally Posted by one58 View Post
Hi I have Rb Concept Rody V12

No matter what I do I get air bubbles in the fuel lines. U tried different length lines and lines going via different routes and still air bubbles form.

It affects the idle and sometimes tune.

How can I avoid this?
Thanks
Make sure your tank is properly damped from the vibration ie: Check mounting screws are not too tight, O rings on the mounting are not cramped and also check the receiver battery does not interfere with the tank, in other word the tank should be slightly loose when you wiggle it. BTW what car are you driving?
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Old 12-03-2009, 09:05 AM   #3
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if you first start the car, there will be a pocket of air, once the fuel has reached the carby, it shouldnt pick up air till the fuel runs low, or it gets too hot. check all the fuel lines, and nipples in the tank, some times if it has a primer on the tank, it will produce an air leak in the tank. a crack in the tank, or a bad fitted Nipple, will cause fuel to also leak, so if you find the tank area is a little wettish, then id replace the tank.
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Old 12-03-2009, 11:48 PM   #4
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I had this problem once with my mtx4. tried new tank, new lines, ect. and nothing fixed it. Then I found that my battery was hitting the tank on the bottom. Had the wrong battery and once I replaced it and made sure my tank was mounted correctly, the problem was gone.

Oh, and the battery was a 5 cell pack but were installed 4 side by side and one sideways which caused the rubbing. It wasn't seated in the plastic tray fully so it was a little high. Make sure you have a 5 cell pack that has all 5 mounted the same direction and it's not hitting the tank.
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Old 12-04-2009, 02:09 AM   #5
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I had the same problem and it was a bad tank
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