Quote:
Originally Posted by GregWeld
Fuel pressure regulators are just as their name implies - they regulate the fuel pressure. Generally the ones you see on aftermarket installs are ADJUSTABLE and that's the difference in the GM versions which are not.
So this is pretty simple really - you have the pump... the pump makes the pressure... so somewhere in your plumbing - you need to install an ADJUSTABLE and VACUUM REFERENCED regulator...
Most injectors are rated at 43 #'s.... if you bump the pressure up from there - they flow more fuel.
If you mount your adjustable vacuum referenced fuel pressure regulator back near the tank -- you'll only have to add a simple RETURN line from the return side of the regulator back to the tank. All this does is bleed off any fuel pressure beyond what you've set it for (requires a gauge to read and set). You actual intake manifold and injectors would then appear to be a deadhead system.
Now - having said all of this - if your injectors are rated at the installed fuel pump pressure. AND if the ECU can be set to the matching fuel pressure.... then you're good to go. I have the EZ EFI and I just input the pressure I set manually at the regulator so that it has this information. There is no "set" pressure - it will ask you during set up - what injectors you have and what pressure you are running.
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good info Greg. That's where I was going with the regulator. Since the guy (who shall remain nameless) that I'm doing an EZ EFI install for won't tell me how he wants things done.............
I'm going to do a rear regulator install like I do on all my EFI conversions. I just run a vacuum reference line back to the regulator. Many said it'd be slow to react, but I haven't seen any issues in the past doing it this way.
One thing I will point out though, fuel pumps do not make pressure.............
Jody