From: Paul Vandervort (pgv@mydb3.com)
Date: Thu Sep 29 2005 - 10:39:30 PDT
Ryan
Nope, the gas had sat so long it built up this tar type material in the
bottom if the tank. Putting fresh gas in it must have dissolved a very
small amount allowing it to be picked up in the gas and once atomized
and hitting a hot intake manifold it resolidify. What started me onto it
was that it was not running correctly at idle. I happened to look down
the carb throat and saw what looked like a glue or tar sitting in the
bottom of the intake manifold. Removed carb to confirm. So I pulled the
intake off and got it all cleaned out. Put her back together and about
two weeks later started having the same problems. Tar back in the
intake. Pulled intake off again, pulled the head and found the same
stuff stuck on the valve stems (by that time I pulled the plugs and I
could see the valves not wanting to close properly). I thought the
valves were sticking due to the usual problems, but the stems also had
that black goo on them that was in the intake manifold. Cleaned all that
mess up. Looked in the tank and I found the "black stuff" all on the
bottom of the tank. I had to take the tank to a radiator shop to get it
cleaned out (really tuff stuff to remove, even MEK wouldn't cut it
easily). Put her all back together and she's a great runner now for 5
years. Must have been from 10 year old gas that was in the tank when I
got the GPW. I remember draining it and putting new gas in it, but I
also let it sit for a few years due to other
projects/commitments/laziness. I currently have the same problem with my
M37B1 so I have to eventually address that.
Basically after all that fooling around, if it's not a vehicle I run
regularly I don't let gas sit in it for more that 6 months. I'll drain
it and out fresh in and what I drain out I'll burn off in my beater car.
Paul Vandervort
Ryan Gill wrote:
> At 11:58 AM -0500 9/29/05, Paul Vandervort wrote:
>
>> MV content: I have a GPW that the gas went bad in. Darn stuff almost turned into tar on the bottom if the tank. Gas would get in the carb, atomize and resolidify as tar on the bottom of the intake manifold! What gas that did get by would loosen the "tar" and allow it to get on the intake valve stems causing them to stick. THat sucked.
>
>
> You sure that wasn't oxygenated fuel eating the natural rubber in the hoses?
>
>
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