Fuel Pressure Regulators????
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Senior Member
Joined: Apr 2003
Posts: 384
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From: Bay Area
Fuel Pressure Regulators????
Does anyone have a fuel pressure regulators on your car?? How does it work? What kind of fuel pressure regulators do you have?? Is it make your car run more rich? I am gonna get one. Please help me out guys.
HAILERS
Joined: May 2001
Posts: 20,563
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From: FORT WORTH, TEXAS,USA
Hey! Are you lucky or what? I just discovered there are a couple of places on the web that have FREE, yes, FREE access to the Factory Serivice Manual!!!!!!! And you can download any chapter you want, not just the whole thing at once!!!!!!! I remember seeing a sectin in that manual that said something like FUEL SECTION and it showed the fuel pressure regulator and how to tell if it's any good/working etc. Try it out. http://www.iluvmyrx7.com man what a coincidence!
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I wish I was driving!
Joined: Dec 2001
Posts: 5,241
Likes: 84
From: BC, Canada
Originally posted by Karack
lol, too funny.
these are fuel injected cars, not american Big Blocks...sometimes too much fuel hurts things.
lol, too funny.
these are fuel injected cars, not american Big Blocks...sometimes too much fuel hurts things.
I run an aftermarket FPR on my car. What exactly do you need to know?
to an extent, i can run about as much fuel through my american muscle as i want until the spark plugs begin to foul, that or the hydraulic pressure begins to be too much for the crank to handle. 
i think the guy just wanted something cheaper than some high flow injectors and a ECU upgrade.
i think the guy just wanted something cheaper than some high flow injectors and a ECU upgrade.
I'm a boost creep...
Joined: Jan 2002
Posts: 15,608
Likes: 8
From: Auckland, New Zealand
All EFI cars have fuel pressure regulators. They are used to maintain a constant pressure difference between fuel rail pressure and manifold pressure, so that the injector flow rate is the same no matter what the load on the engine.
So for example a 5ms (0.005sec) injector pulsewidth results in the same volume of fuel injected whether the manifold is at low pressure (light throttle) or high pressure (WOT and/or boost).
Aftermarket FPR's work exactly the same, but the pressure differential is adjustable, so you can set your base fuel pressure.
Some aftermarket FPR's are refered to as "rising rate", because the pressure differential is not constant, but increases are manifold pressure rises. These are basically a crude band-aid for injectors that are too small.
So for example a 5ms (0.005sec) injector pulsewidth results in the same volume of fuel injected whether the manifold is at low pressure (light throttle) or high pressure (WOT and/or boost).
Aftermarket FPR's work exactly the same, but the pressure differential is adjustable, so you can set your base fuel pressure.
Some aftermarket FPR's are refered to as "rising rate", because the pressure differential is not constant, but increases are manifold pressure rises. These are basically a crude band-aid for injectors that are too small.
Last edited by NZConvertible; Oct 30, 2003 at 10:56 PM.
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