[T3] fuel pump output -error

[Jim Adney]

On 28 Feb 2011 at 22:44, Bobsnotch at aol.com wrote:

> I think Ray is using 1 pump as a "lifting" pump (like a rabbit has), and  
> the other pump is the main supply pump. What he's doing, by doing this, is to 
>  ensure that fuel delivery isn't an issue with his closely tuned t-4 engine 
>  (where pressure deviations of 2 psi can cause a lean condition). He's been 
>  playing with it for years, and found fuel delivery to be a problem (using 
> the  stock pump).  

If so, he's thinking about it wrong. Two pumps in series will give 
him the same rate of fuel delivery, but they might be capable of 
delivering it to a higher pressure. Since the only way the pressure 
can drop would be for the flow to be insufficient to keep the 
pressure regulator open, he needs more flow. The only way to get more 
flow would be to put 2 pumps in parallel.

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Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA
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