Why do I have white deposits in my carbs?

[DClark]

My pilot fuel jets clog up with some strange white deposit every ten miles. The tank has been POR'ed to seal it, I use ethanol treatment ((stabile marine).
I took out the fuel filter and it was full of some white like substance. The base of it had chalk like deposits. So, why am I getting this? What should I do?

[92xjunker]

Could be additives in the fuel like ethanol or could be from moisture getting in the fuel.

[shpielers]

Is it possible the POR15 is staring to strip off or dissolve somehow? If it didn't cure properly or wasn't mixed well enough it might be possible. Haven't heard ANYONE ever having an issue with it, but there's a first for everything...
Maybe try dumping the contents of the tank and visually inspecting both the tank and the gas that was in it. Might be the gas you filled up with happened to somehow contain lots of crap. Then try filling up with fresh gas and seeing if the problem persists. Might be time for a carb clean too.
The fuel stabilizers I've used tend to leave a greenish varnish as opposed to white gunk, but that could just be the stuff I use.

[loneraider]

++++1
Shpielers reply is what I would do. I've never used por 15 before
but dumping the tank and inspection of it to make sure all is well there. than give the carbs a clean. Here in Ontario Shell gas high test has no ethanol
in it. I use the regular stuff most of the time and have no issues with it but I pull my carbs at the end of riding season and give them a good clean. Hope you get this resolved soon.

[DClark]

Looking into the tank, the por coating looks fine. On the petcock, I took it and put in a shot glass of berrymans- that easily dissolved the chalky deposits.
I have used Stabil marine, dbl dose stabil marine, even dbl dosed stabil marine w/ marvil mystery oil.
My next step will be to buy some 100 oct racing gas near my work site and try it. I know I don't need the octane but it is ethanol free.
FWIW, on one tank it did this, the ethanol was only 5%, usually it is 10% ( I have a test kit to measure it).

[Wild-Bill]

Chalky deposits are usually aluminum oxide. You've had water in your fuel and it's been in your float bowls for a while.

[DClark]

Chalky deposits are usually aluminum oxide. You've had water in your fuel and it's been in your float bowls for a while.

I was thinking the same thing, but my fuel filter (the one on the fuel petcock inside the tank) was coated, had it in the screen mesh material and the base.
I don't think there is any aluminum in the fuel tank.

[92xjunker]

Your petcock is.

[DClark]

Your petcock is.

So. is the theory that water in the gas is causing corrosion on the petcock, which is clogging things up? Why then do the deposits easily dissolve with Berrymans (which I think is mostly toulene?).
I got it all back together, lacks power, as if it needs gas. I think the emulsion tubes might have crap in the little holes, I'll pull them out in a few weeks when I have time.
Nice day to take the connie to the Sparks rib fest.
Thanks for the input, guys!

[92xjunker]

If it were fuel additives, I've never had that, green or brown, yes but i get the special Cali fuel.....lol. there is more additives than actual fuel.

[DClark]

If it were fuel additives, I've never had that, green or brown, yes but i get the special Cali fuel.....lol. there is more additives than actual fuel.

I also get cali fuel. All of our fuel in N. NV is sent via pipeline from the SF Bay area, a mixture of BP/Tosco/Chevron, top octane is 91 and once it is at the yard in Sparks, they blend in 10% ethanol to help make it even crappier.

[daddijuggalo]

as far as I know the white chalkey stuff is from the ethynol after the fuel evaporates.i had the same issue

[DClark]

as far as I know the white chalkey stuff is from the ethynol after the fuel evaporates.i had the same issue

How did you fix it?

[Wild-Bill]

I had a set of carbs which had been left outside for several years in NJ. They were all ate up with white, chalky residue; inside and out. A toothbrush wet with kerosene took care of the chalky stuff. The damage deeper in the metal was just something to work around. Some of the parts got pretty brittle and I even had to replace one of the carb bodies. I'm sure yours haven't gone that far. You've probably just got some water dissolved in all that Cali ethylene. I'd be curious if you've got white blobby stuff inside the carbs. Someone was describing that a while back as ethylene and water mixed.

[DClark]

The carbs themselves look good- not a spec of white or pitting.