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Sugar in fuel system?
Posted 10 January 2013 - 12:01 AM
GD took a look at it and we are fairly convinced it is sugar or something of that nature.
This is in all of the heads. Hard as a rock. Have to use a screw driver to break it off.
And traces of it in the fuel filter. Pull it out. Same color and hard texture.
Sugar in the gas tank? Whatever it is. I believe it is the reason the old heads locked up on the intake side.
Posted 10 January 2013 - 12:58 AM
But, supposedly, sugar is insoluble in gasoline (despite the 'common wisdom' of sabotaging a vehicle with it - dunno about gas with 10% ethanol) but, it WOULD clog a filter. Dunno about honey or molasses.
wonder what the 'sock'/strainer on the fuel pump looks like? Or could that stuff have come from the PCV system?
maybe put some near a sweet-eating ant bed and see if they go for it!
Edited by 1 Lucky Texan, 10 January 2013 - 01:06 AM.
Posted 10 January 2013 - 01:01 AM
The PCV system was cleaned and a new PCV valve was installed.
It looks like that on each and every intake port on both heads.
Posted 10 January 2013 - 08:12 AM
apparently you can heat it up with a torch to clean it up or free up the sticking valves and then smell it to identify it.
Posted 10 January 2013 - 11:16 AM
Posted 10 January 2013 - 11:18 AM
Posted 10 January 2013 - 12:55 PM
And no one has gotten angry at me...Yet. Heh. It was something someone did to the previous owner.
Posted 10 January 2013 - 01:27 PM
At the time it didn't occur to any of us that this had come from the fuel. I postulated that perhaps they had fed something into the intake (as you do with products like Seafoam that are popular) that had caused this. Maybe some smoke-away type thickener product and it had reacted badly with the fuel and coated everything in sticky goo.
Engine was rebuilt and ran really well for about 100 miles. Then problems began to arise - idle quality when cold was really bad (in retrospect that was the valves sticking again) and at about 140 miles it developed a rod knock. Upon dissasembly we found the same goo. That's when I realized it had to be coming from the fuel. When it hits the hot cylinder heads it turns into rock candy. Bits of this got into the oil and the sugar crystals chewed the hell out of the rods and mains. It will now require an undersized crank, new bearings, rings, and a new oil pump and pickup. Probably a new oil pan as well.
We have all heard tales of pouring sugar in the gas tank but I personally had never seen the results of it. I have heard that bleach in the gas tank will do really awful things also.
Anyway - it's an expensive and horrible thing to do to an engine and it's definitely something for the picture archives and for a "machine care picture of the month" at my shop. :-\
Posted 10 January 2013 - 02:09 PM
Or, did someone go overboard on some kinda headgasket fix/'mechanic in a can' stuff?
anyway, if you are finding crystals in the tank, clearly the stuff is not very well dissolved by gasoline. But it certainly seems enough is - or gets through - to cause problems!
Edited by 1 Lucky Texan, 10 January 2013 - 02:21 PM.
Posted 10 January 2013 - 03:27 PM
guess you don't have full coverage insurance? i've heard of sabotage being covered by insurance...but not sure if "pre-existing sabotage" would be covered, how nuts.
Most places say "sugar doesn't dissolve in gas", it's all over the internet. But this has nothing to do with technical academic approaches to solutions. A motorized vehicle *probably* moves in which case particulate matter will suspend.
Posted 10 January 2013 - 04:19 PM
sodium silicate is used in some radiator stop-leaks products.
oh yeah, I'll ask the obvious; Did you taste a piece of the deposit to see if it's sweet?
a REAL mechanic would. lol!
Posted 10 January 2013 - 04:32 PM
It may not dissolve in gasoline - but that doesn't mean they didn't put water in the tank or the tank didn't have some water in the bottom of it - as many cars that have been sitting for a period of time, are 20+ years old, and have 230k on them are prone to having.
Posted 10 January 2013 - 05:13 PM
It looks like sugar will dissolve into the water dissolved into isopropyl alcohol, though, so a snaky bastard might go that route.
Edited by CNY_Dave, 10 January 2013 - 05:20 PM.
Posted 10 January 2013 - 06:42 PM
Posted 10 January 2013 - 10:14 PM
Posted 11 January 2013 - 10:51 AM
The substance must have been in liquid form to get through the fuel filter. Then, once the gasoline vaporized, the substance turns into a solid.
There is just so much of it, I have to think this is sabotage, pure and simple.
I am thinking the gas tank and fuel lines are also full of this stuff.
Posted 11 January 2013 - 10:59 AM
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