I just noticed that my adjustable fuel pressure regulator doesn't use vacuum. I have fuel pressure set to 42 lbs. It seems to be steady while at idle or while driving. Why do most of the FPR's I see need vacuum? Would this cause my car to run rich and smell like gas all the time?
No, there is no brand name on it. I've never seen one like this either. It bolts up in the stock location and almost looks like the stock FPR. It is definitely adjustable because when I bought the car the fuel pressure was set to about 50lbs so I adjusted it back down to 42lbs. There is a screw on the top of it(looks like a set screw) for making adjustments.
I have heard of folks taking a stock regulator and putting a bolt in it to use as an adjuster. I have never seen it done before.
Can you get some pics of this thing? Even if they are not that great they should help others a great deal in figuring out what you have.
Then again you do have a boosted application, so all of my thoughts should be taken with a grain of salt.
Here is the only pic I have. You can see it behind the TPS wires. I don't have any close up pics right now but it does look similar to the stock FPR. Doesn't the stock one use vacuum though? There is nowhere on this thing to hook up a vacuum line.