[T3] so it was 60 last friday

[Jim Adney]

On 23 Feb 2011 at 12:29, Keith Park wrote:

> Well according to Ray Greenwood (who doesntknow that the type 3 E pressure
> sensor exists) has seen fuel pressure fluxuate with throttle position,
> causing problems in the T4 application, I cant imagine that the T3
> application would be different enough to change that but Ray actually puts
> TWO fuel pumps in series to eliminate this problem. 

That's just a little bit nuts. i've seen pressure fluctuations with 
throttle position, too, and big ones, but they are quickly cured by 
cleaning the filter screen or replacing the inline filter. To me, 
this looks like he's taken one observation and made the wrong 
conclusion from it, and this led him down a very silly path.  

There's no way a check valve would have ANY effect on this. Fuel 
would have to try to stop or flow backwards for the check valve to 
try to close. The pump is a constant displacement pump; it has no 
idea of what the throttle is demanding and it's running into a 
constant pressure.

Keith, since you're well versed in electronics, consider how much it 
would improve the voltage regulation of a power supply if you put a 
diode in series with it's output. The analogy is nearly perfect.

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