Hi,

Hi,

But I have 38#'s with the vacuum hose disconnected, where the back of
Bentley calls for 35#'s.

That matches the 3# difference I had with the vac hose connected, without
the fancy math.

Sorry, I have very young kids in the house, I don't have time to refresh and
do the math you did. Still David,your contributions are a real asset.

Sincerely,
Mark Ingalls
85 GL
75 Beetle

>From: David Beierl <dbeierl@ATTGLOBAL.NET>
>Reply-To: David Beierl <dbeierl@ATTGLOBAL.NET>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Re: Fuel Pressure Info
>Date: Wed, 1 Aug 2001 22:53:14 -0400
>
>Ok, I worked out the numbers.  Bosch wants fuel pressure to be a constant
>2.5 bar or 36 psi greater than manifold pressure.
>
>At 06:46 PM 8/1/2001, Mark Ingalls wrote:
>>Here are the results:
>>New Regulator-31psi@12" vacuum, Bentley says I should have 28psi.
>>Old Regulator-32psi@12" vacuum
>
>Lessee, 12" vacuum = (29.92" - 12") MAP [Manifold Absolute Pressure] =
>17.92" MAP = 8.7 psia [psi absolute, referenced to complete vacuum] MAP.
>
>Spec is (36 psia + MAP) = 44.7 psia = 30.2 psig [psi gauge, referenced to
>atmospheric pressure].
>New one is a pound high, old one two pounds high.
>
>
>>New Regulator-29psi@18"vacuum
>>Old Regulator-28psi@18"vacuum
>
>18" vacuum = (29.92" - 18") MAP = 11.3" MAP = 5.5 psia MAP.
>
>36 psia + 5.5 psia = 41.5 psia = 27 psig
>New one is two psi high, old one is one psi high.
>
>Sounds like they're both regulating within 38/36 or six per cent high.
>
>david
>
>
>David Beierl - Providence, RI
>  http://pws.prserv.net/synergy/Vanagon/
>'84 Westy "Dutiful Passage"
>'85 GL "Poor Relation"

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