[T3] Fuel pressure and elevation

[Mike Fisher]

I think it is AOL to gmail. bull shit software connection that blocks them
to us.

On Tue, Aug 23, 2016 at 9:57 AM, Daniel Nohejl <d.nohejl at gmail.com> wrote:

> Ok, so I read around a little more……only on some other automotive forums,
> so I don’t have anything scientific, but it seems that unless one has an
> “absolute gauge" then for every 1000’ of elevation gain your average fuel
> pressure gauge reads anywhere from .5psi-1psi lower than actual fuel
> pressure. This makes sense since at sea level, my gauge read 29psi but at
> around 8000’ it read 25psi. So what I wound up doing at elevation was
> increase the fuel pressure by 4 psi because the gauge reading was
> off……assuming that what I read about gauges and altitude is true.
>
> Here’s another possibility…….I also had a clogged fuel filter which
> ultimately caused a really horrible and constant moaning sound up at the
> fuel damper/dampener. At the stage of the trip where I measured the fuel
> pressure, the noise at the damper was only intermittent and I hadn’t yet
> identified the filter as the culprit. Perhaps the pressure reading was low
> on account of the clogged filter and I raised it to normal which then
> became too high once I changed the filter.
>
> Jim’s the physicist, though, so maybe he can give us the straight dope on
> fuel pressure and altitude.
>
> Incidentally…….am I the only one who sometimes doesn’t receive responses
> to posts? I only saw Keith’s response to me by going to vwtype3.org <
> http://vwtype3.org/> and looking at the archive for August. Sometimes it
> happens with replies to me and sometimes in relation to others. For
> example, I might receive someone’s reply to a post without ever receiving
> the original post in my inbox.
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-- 
Eugene, Oregon

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