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Engines leans down a lot once tank gets to 1/4 full

Engines leans down a lot once tank gets to 1/4 full

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Old 12-21-2005, 04:24 PM
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In his frist post he stated he already did that!
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Old 12-24-2005, 01:44 AM
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one more thing to check. when the tank gets to about 1/4 left, is your fuel foaming/bubbling? You might have the screws too tight holding the tank in and not letting the rubber groments absorbe the vibrations.
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Old 12-31-2005, 06:57 AM
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Thanks for all the help... The problem turned out to be a tuning issue. My high end was too lean and the low end too rich.
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Old 01-22-2006, 12:12 AM
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got same experience.... so which needle did you adjust
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Old 02-10-2006, 07:47 PM
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hopefully both from what I was reading at the start of this thread.
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Old 02-16-2006, 02:11 PM
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I just had the same problem on my TNX Pro Monster Truck ... and the solution was to use a loooonger presure line ... now i have the same engine behaviour during the entire tank ... just a "tad" lean when its almost dry (just the smell of fuel in the tank and fuel mainly on the tubing) but thats normal ...
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Old 02-16-2006, 08:11 PM
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I have the same issue. I have 5-1/2 inches of line from the tank to the carb. I have a fuel filter. I have not yet replaced the tank. I keep messing with the low and high speed needles, but I'm not getting anywhere. UGH!!!!

I do get smoke coming from my fuel tank when I open it, though.
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Old 02-17-2006, 01:08 AM
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Originally Posted by sstupid
I do get smoke coming from my fuel tank when I open it, though.
That's just exhaust gas,nothing to worry about.

Allan
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Old 02-17-2006, 06:07 AM
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so how long (in inches) is your pressure line now need to try that too
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Old 02-17-2006, 10:35 AM
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So, what are the recommended lengths for:
1) Pressure line
2) Feed line?

Thanks.
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Old 03-09-2006, 04:56 PM
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The pressure line and the feed line should be within 1/2 an inch length of each other. I find that a slightly longer feed line works well, but you will have to prime fuel into the line before the beast will kick over.

Also, a tip I have found very usefull, is to ensure you allow the petty lid to "SNAP" shut, as if this is not AIRTIGHT, pressure will fail to build inside the tank.
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