[DeTomaso] Fuel Pressure

[Ken Green]

BIG OPPS on my part,  
 
Thinking about it, vacuum is negative pressure.  If you have 10 inches Hg at idle (equal to about -5 PSI or about 10 PSIA) and you punch it and the vacuum drops to zero, the MAP goes from 10 PSIA to 14.7 PSIA.  To have the same fuel flow as a function of injector period, the fuel pressure would have to rise 5 PSI to overcome increase in intake manifold absolute pressure (MAP).  So it may be bad if fuel pressure drops just when it needs to go up .  
 
Maybe a smart ECU deals with this?
 
Ken

--- On Thu, 6/4/09, JDeRyke at aol.com <JDeRyke at aol.com> wrote:


From: JDeRyke at aol.com <JDeRyke at aol.com>
Subject: Re: [DeTomaso] Fuel Pressure
To: wdemelo at cogeco.ca, detomaso at realbig.com
Date: Thursday, June 4, 2009, 11:14 PM


In a message dated 6/4/09 4:55:53 PM, wdemelo at cogeco.ca writes:

> My tuner told me the pressure gauge should not move at all, under any 
> circumstances. I was just at a friends place and he revved his efi Pantera and 
> it went from 44 to 40lbs everytime he hammered the gas.
> 
Quite a few aftermarket injection systems, particularly on high horsepower 
engines, run up to 60 psi into the injector rails. Where is the fuel being 
pulled from the tank, and what size line? Everything should be at least 3/8" 
ID all the way from the bottom of the tank thru the pump out to the injector 
rails, and whatever pump you use should maintain that pressure with no 
drop, as your mech said. Maybe its time for a bigger pump? Wish I was there to 
help- J Deryke


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