NTC3 Fuel Tank Problem - K Factory Low CG
06-10-2011, 06:34 PM
#1
NTC3 Fuel Tank Problem - K Factory Low CG
I have a NTC3 that has been giving me problems. I'm running a OS Max .12TR turbo head. I thought it was the engine but I have taken it apart, cleaned and sealed everything and it seems to run great as long as I don't let it load up.
What it does is start flaming out whenever it gets to about 1/3 tank, sometimes a little more. The fuel and pressure lines are new. I noticed when it is running the pressure and vibration has the fuel bubbling and foaming quite a bit. It seems when it gets down to about 1/3 tank or so the fuel flow becomes inconsistent. If I get on it slowly it may be ok but if I go full throttle it may just start to rev then die. It will start right back up and then do the same thing.
If I fill the tank up and restart it, everything is fine! So I know the problem is with the fuel flow once the tank gets between 1/2 and 1/3. I am using the K Factory low CG tank.
Anyone have this problem? I am thinking maybe I should just buy a stock tank and see if that fixes the problem, but I do like the K Factory low CG tank. I don't know if it's the tank or too much pressure from the pipe causing all the bubbling and foaming or what. But like I said, when the tank is full, it screams!
Anyone have any ideas? Thanks!
What it does is start flaming out whenever it gets to about 1/3 tank, sometimes a little more. The fuel and pressure lines are new. I noticed when it is running the pressure and vibration has the fuel bubbling and foaming quite a bit. It seems when it gets down to about 1/3 tank or so the fuel flow becomes inconsistent. If I get on it slowly it may be ok but if I go full throttle it may just start to rev then die. It will start right back up and then do the same thing.
If I fill the tank up and restart it, everything is fine! So I know the problem is with the fuel flow once the tank gets between 1/2 and 1/3. I am using the K Factory low CG tank.
Anyone have this problem? I am thinking maybe I should just buy a stock tank and see if that fixes the problem, but I do like the K Factory low CG tank. I don't know if it's the tank or too much pressure from the pipe causing all the bubbling and foaming or what. But like I said, when the tank is full, it screams!
Anyone have any ideas? Thanks!
06-10-2011, 08:51 PM
#2
I have heard about guys using small foam rings under the ntc3 tanks in addition to the rubber O rings to dampen the engine vibrations , and eliminate bubbles inside the tank ! Also do not overtighten the tank screws : the tank should be able to rock a little .....
06-11-2011, 07:24 AM
#3
Thanks for the tips. I used some shock o-rings under the mounting points, maybe they don't absorb enough vibration. I loosened them up but it won't rock, if I go any looser I think they will vibrate out. I have some foam, I may try cutting some pieces of that to see if it absorbs more vibration. Thanks!
07-05-2011, 08:42 AM
#4
Turns out the tank was bad even though I pressure tested and could find no leaks. I replaced it with a stock NTC3 tank and the problem is completely gone! The only thing I can guess is maybe the pickup was partially blocked or the line between the pickup and fitting inside the tank had a problem that caused inconsistent fuel delivery.
But in any case the old tank was causing all the weird symptoms and random flame outs.
But in any case the old tank was causing all the weird symptoms and random flame outs.
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