Smoke/Fumes from the Fuel Tank
01-14-2009, 07:36 PM
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Smoke/Fumes from the Fuel Tank
Hello Everyone.
Quick question - After a while of running my RS4 Evo (which runs great, appears to be tuned), I open the fuel tank and there is like fumes/smoke coming out of it, not very thick. Is this normal? I presume it is coming from the pipe pressure hose thing.
On the same note, it appears after a while of running, when this smoke problem happens, I get some air bubbles in my fuel line, sometimes causing it to stall (and I have to prime it again).
Anyone know what the deal is? I have it tuned to what I think is right. I have great performance and it blows plenty of blue smoke and idles fine.
Thanks.
Quick question - After a while of running my RS4 Evo (which runs great, appears to be tuned), I open the fuel tank and there is like fumes/smoke coming out of it, not very thick. Is this normal? I presume it is coming from the pipe pressure hose thing.
On the same note, it appears after a while of running, when this smoke problem happens, I get some air bubbles in my fuel line, sometimes causing it to stall (and I have to prime it again).
Anyone know what the deal is? I have it tuned to what I think is right. I have great performance and it blows plenty of blue smoke and idles fine.
Thanks.
01-14-2009, 08:09 PM
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RE: Smoke/Fumes from the Fuel Tank
Let it be, that smoke aint doin' anything to you!
Nah, seriously, it is okay to see smoke in the fuel tank. Afterall, the exhaust pipe presurizes the fuel tank by way of the tank pressurization line, so some exhaust is bound to enter that tank.
Nah, seriously, it is okay to see smoke in the fuel tank. Afterall, the exhaust pipe presurizes the fuel tank by way of the tank pressurization line, so some exhaust is bound to enter that tank.
01-14-2009, 08:11 PM
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RE: Smoke/Fumes from the Fuel Tank
Ahh okay makes sense then.
What about my air bubbles in my fuel line? It only seems to happen when the car is running hot...and 'possibly' when it is under half a tank of fuel.
What about my air bubbles in my fuel line? It only seems to happen when the car is running hot...and 'possibly' when it is under half a tank of fuel.
01-15-2009, 03:43 PM
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RE: Smoke/Fumes from the Fuel Tank
Try using a small o-ring on the outside of the fuel line at the fitting as a clamp. This may stop some of the air bubbles you see in the line.
01-15-2009, 05:00 PM
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RE: Smoke/Fumes from the Fuel Tank
ORIGINAL: locksmack
Ahh okay makes sense then.
What about my air bubbles in my fuel line? It only seems to happen when the car is running hot...and 'possibly' when it is under half a tank of fuel.
Ahh okay makes sense then.
What about my air bubbles in my fuel line? It only seems to happen when the car is running hot...and 'possibly' when it is under half a tank of fuel.
01-15-2009, 07:23 PM
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RE: Smoke/Fumes from the Fuel Tank
Probably about 1cm long, so not HUGE but not mini bubbles.
It is possible they might sit at the highest point of the tube, I never really noticed. Is this normal?
It is possible they might sit at the highest point of the tube, I never really noticed. Is this normal?
01-16-2009, 01:31 PM
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RE: Smoke/Fumes from the Fuel Tank
1cm long is absolutely ENORMOUS. You definitely have an issue and your tuning must be thrown way out when they pass into the engine causing a lean condition. This has nothing to do with the smoke in the tank which is perfectly normal. Do you have an inline fuel filter? If so, do the bubbles form before or after the filter, or both? If you don't have a filter, or they are formed before it, then you should first replace ALL the fuel lines, and if it still does it, consider replacing the fuel tank as the next step, as they're not expensive. You should not be having bubbles that big forming in your lines except right at the last few seconds of the tank or after a run of big jumps (since it's an on-road car, I guess this doesn't apply. At least I hope so! lol).
01-16-2009, 07:01 PM
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RE: Smoke/Fumes from the Fuel Tank
Hmm interesting, thanks for that mate.
The bubble just seems to sit at the highest point of the fuel line, doesnt actually hit the carb.
I don't believe I have a filter.
I will take her for a run today and see if I can notice anything more.
The bubble just seems to sit at the highest point of the fuel line, doesnt actually hit the carb.
I don't believe I have a filter.
I will take her for a run today and see if I can notice anything more.
01-17-2009, 05:27 AM
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RE: Smoke/Fumes from the Fuel Tank
If it just sits there, stationary, then ignore everything I said, it should be ok. Still a 1cm bubble is big... I dunno mate go with your instincts, if you get an erratic idle, and you find yourself retuning every run, this may be a factor, if it seems to run fine, don't worry about it.
Was it an RTR? IF so, then when they sit on the shelves for a few months, the fuel lines expand around the niopples on the carb and fuel tanks, and often let a little air in. When I buy an RTR I always change the fuel lines for brand new before I run it, they just seal better, and it's so cheap it just makes sense.
Was it an RTR? IF so, then when they sit on the shelves for a few months, the fuel lines expand around the niopples on the carb and fuel tanks, and often let a little air in. When I buy an RTR I always change the fuel lines for brand new before I run it, they just seal better, and it's so cheap it just makes sense.
01-17-2009, 12:42 PM
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RE: Smoke/Fumes from the Fuel Tank
ORIGINAL: Foxy
1cm long is absolutely ENORMOUS. You definitely have an issue and your tuning must be thrown way out when they pass into the engine causing a lean condition. This has nothing to do with the smoke in the tank which is perfectly normal. Do you have an inline fuel filter? If so, do the bubbles form before or after the filter, or both? If you don't have a filter, or they are formed before it, then you should first replace ALL the fuel lines, and if it still does it, consider replacing the fuel tank as the next step, as they're not expensive. You should not be having bubbles that big forming in your lines except right at the last few seconds of the tank or after a run of big jumps (since it's an on-road car, I guess this doesn't apply. At least I hope so! lol).
1cm long is absolutely ENORMOUS. You definitely have an issue and your tuning must be thrown way out when they pass into the engine causing a lean condition. This has nothing to do with the smoke in the tank which is perfectly normal. Do you have an inline fuel filter? If so, do the bubbles form before or after the filter, or both? If you don't have a filter, or they are formed before it, then you should first replace ALL the fuel lines, and if it still does it, consider replacing the fuel tank as the next step, as they're not expensive. You should not be having bubbles that big forming in your lines except right at the last few seconds of the tank or after a run of big jumps (since it's an on-road car, I guess this doesn't apply. At least I hope so! lol).
+1 you need to get new lines and maybe a tank
01-17-2009, 07:38 PM
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RE: Smoke/Fumes from the Fuel Tank
Yeah it was RTR.
Haven't had a chance to do more testing but I will likely just change the lines and tank anyway - they aren't going to be too expensive.
Thanks so much for your replies everyone.
Haven't had a chance to do more testing but I will likely just change the lines and tank anyway - they aren't going to be too expensive.
Thanks so much for your replies everyone.
