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Re: [T3] Fuel in oil

On 3 Jan 2003 at 21:24, Daniel Baum wrote:

> Anyway, he doesn't agree with the idea that fuel is leaking through the
> carbs into the sump. The only way this could happen, he says, is if my
> piston rings are worn, which he does not believe to be the case, as the
> engine doesn't burn oil. If petrol was leaking from the carbs, it would
> accumulate in the cylinder. Some of you have sounded as if this is what you
> think too. This accumulation of petrol would cause pressure in the cylinders
> which would burst the head, bend a rod, or whatever, as has been mentioned
> in previous postings.

Gas CAN leak past the rings slowly, it just can't get past them quickly. Most 
people don't realize that the rings only seal partly because of the cylinder 
pressure. They don't make very good seals at all if they are standing still, 
the gas can leak around their backsides.

> The only other way that petrol could get into the case is via the fuel pump.
> Can I conclude that this changing the fuel pump would solve the problem? If
> so, I would really like an original VW Type 3 fuel pump, rather than another
> Brosol one. Does anyone have one?

It's generally easy to see if the pump diaphram has been leaking. Just remove 
the pump, leaving the bakelite pump stand and pushrod in place and look at the 
top of the pump stand and inside the bottom of the pump. Those areas will 
either be wet with gas or not.

I thought that most pumps had a weep hole under the diaphram so that major 
leaks would cause very clear leakage out onto the top of the engine. Have you 
seen any signs of this?

While I don't blame you for wanting a proper pump, I wouldn't waste time on 
that now unless it becomes clear that this is your problem.

Jim Adney
Madison, WI 53711-3054

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