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Old 08-01-2011, 11:56 AM   #1
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Default Fuel Tank tips

I have a D8 fuel tank on my XB808, when the car turns upside down and if the tank is half empty the engine stalls almost immediately.

Then tank is not leaking. I have checked the clunk and it seems to work fine.
I have replaced the fuel line inside it with a softer one.

I have not used the original xray tank because there is no clunk on it, hence that means that after I turn the buggy upside down after a 10 seconds the engine will stall. Correct ?

Are there any tips on how to overcome this issue ?

Or are there any better tanks that fit on xb808?
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Old 08-01-2011, 12:01 PM   #2
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Don't hit the throttle lol. I run an mbx6 without clunk and my car nevers stall during a race while upside down. It does stall sometimes when I'm practicing and I'm endlessly waiting on marshall to flip me because I'm too lazy to go downstairs. Mine idles fine for about 20-30sec upside down without clunk.
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Old 08-01-2011, 12:03 PM   #3
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They have some good info in this thread.

my engine stops when the buggy is upside down
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Old 08-01-2011, 12:12 PM   #4
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Originally Posted by morgoth View Post
Don't hit the throttle lol. I run an mbx6 without clunk and my car nevers stall during a race while upside down. It does stall sometimes when I'm practicing and I'm endlessly waiting on marshall to flip me because I'm too lazy to go downstairs. Mine idles fine for about 20-30sec upside down without clunk.
Shall I use the original xray tank instead without clunk ?
will that be ok?
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Old 08-01-2011, 12:34 PM   #5
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Quote:
Originally Posted by mike80 View Post
Shall I use the original xray tank instead without clunk ?
will that be ok?
I should be OK. There are a lot cars out without clunk and they all idle fine upside down. Just don't rev the engine since you'll burn the fuel inside the fuel line. Just make sure you tune your engine good and it will long enough in a race. I about 30cm of fuel tubing in my car. From the tank to the front bodypost and then to the carb.
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Old 08-01-2011, 01:32 PM   #6
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i run d8 with the clunk and no problems how much tubing did you leave inside the tank? the clunk has to move freely. i had a problem with mine when i replaced my fuel tube i pushed too much line inside the tank and when the car flip over the clunk didnt move to the top. like it was supposed to do. thats my 2 cents
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Old 08-01-2011, 01:33 PM   #7
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Are you running the fuel tank mod?
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Old 08-01-2011, 07:47 PM   #8
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Nothing wrong with the xray tank. Use it, you wont have any problems. If your engine sound changes as soon as you flip the car over, example; engine revs up, adjust the LSN. A properly tuned motor will idle upside down.
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Old 08-01-2011, 08:57 PM   #9
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Quote:
Originally Posted by stallen50 View Post
Are you running the fuel tank mod?
Explain, please.

Thanks
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Old 08-02-2011, 05:54 AM   #10
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Mike XRAY tank is fine. I've seen plenty of guys run the kit tank on their 808. Not having a clunk you should just run extra fuel line as morgoth said to prevent it stalling when its upside down. Adding an external fuel filter would also give a little more fuel in the line to help when it's upside down.
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Old 08-02-2011, 10:15 AM   #11
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Quote:
Originally Posted by John. View Post
Mike XRAY tank is fine. I've seen plenty of guys run the kit tank on their 808. Not having a clunk you should just run extra fuel line as morgoth said to prevent it stalling when its upside down. Adding an external fuel filter would also give a little more fuel in the line to help when it's upside down.
I think this is the best solution!!!
Thanks
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Old 08-02-2011, 03:42 PM   #12
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sounds to me that your low speed needle is not tuned right, check it again, and yes having a longer fuel line and fuel filter also helps, never once stalled being upside down with xb808 tank.

Your idle should be set right a 0.5 gap is usually in the ball park but different fuels different brands different plugs all have contributing factors to your idle setting.

Read up on the engine threads, plenty of info there.
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