1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Gas boiling in 48 ida carb

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Old 08-01-17, 12:17 AM
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Gas boiling in 48 ida carb

anyone ever have this issue before? i know my gas is boiling in the float since i took the top of the carb off and can visually see it boiling.
Old 08-01-17, 03:05 PM
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Try a few things, as my experience with nikki's fuel boiling is very similar.

first, run startron fuel stabilizer in the gas tank. Any parts chain carries it, small blue bottle.
​​​​
Try running higher test gas than 86/87. It's got a good bit of eathanol nowadays and boils over easily.

third, try the RB heat shield under the intake wrapped in thermo tape.

What altitude are you?
Old 08-01-17, 03:38 PM
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Im at 1850 feet.
ill try wrapping the exhaust and making my own heat shield. I cant really justify spending 100 dollars on a bent piece of aluminum
Old 08-01-17, 05:52 PM
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I'm at or new sea level and I've never seen fuel boil in a Nikki (even with a hot turbo under the mani with no heat shield and very little wiggle room for a finger). I do have a stock phenolic carb spacer and I also use 92 octane.
Old 08-02-17, 08:20 AM
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I'm seeing fuel boil issues in the heat when running the engine hard. I think my issues is I'm using a generic air cleaner thats open all around, one of those chrome 13 or 14 inch jobs and I think I need to replace my coolant. When I was last in the mountains my temps were running warmer and when I pushed hard at times I would get fuel boiling which would go away if I let off and things cooled a bit. This was at 2-5,000 feet.

So swapped back on the stock air cleaner but with the snout removed (to clear my strut bar) and its running a little cooler now. Next I'll change the coolant which is a couple of years old. That should solve any temp issues and my nikki boiling.

When I had a Dell 48 I ran a homemade shield on the intake to solve problems like this and I also wrapped the headers. You may need to do the same.




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