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[SRavet at bangate.compaq.com]

ws6transam at voyager.net (Daniel R Burk) Wrote:
| One quick question though, Ed:
| 
|         I don't understand your explaination of the fuel regulator in 
part 1.
| You state that by plumbing the regulator to the intake manifold, as 
manifold
| pressure rises, it biases the regulator in order to keep a steady 45 PSI. 
 
| 
| I always thought that by plumbing it to the intake manifold, you 
effectively
| allow manifold pressure to effect change into the regulator pressure. So, 
in
| effect, as engine loading increases, and manifold pressure increases, a 
corr-
| esponding increase in fuel pressure results.  What's the deal?
| 
| ---Dan.

The pressure across the injector varies with vacuum.  Remember that the end 
of it may be seeing atmospheric pressure (WOT) or a vacuum (idle).  A 
regulator will hold fuel pressure at 45 psi, but the vacuum on the injector 
end varies from 0 to 8 psi or so.  A regulator that is plumbed to the 
intake will maintain 45 psi across the injector regardless of the vacuum in 
the intake.  You can also take vacuum into account in software by modifying 
the injector pulse, but the regulator makes things a lot easier.

Steve Ravet
sravet at bangate.compaq.com
Baby you're a genius when it comes to cooking up some chili sauce...