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Old 12-20-2007, 09:53 PM   #1
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Default Fuel Pressure regulator

I have a 1990 miata 5spd and I installed a fuel pressure regulator and yet it won't read any pressure. Which line should I connect to the FPR? There is a line that comes from the bottom of the stock FPR and that's where I've tapped off into the AFPR and then from there to the metal line that is on the top. I 've adjusted the screw and yet nothing happens. What gives?
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Old 12-20-2007, 09:54 PM   #2
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Where are you reading fuel pressure from?
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Old 12-20-2007, 09:58 PM   #3
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On the FPR gauge.
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Old 12-20-2007, 10:37 PM   #4
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does it read any pressure?
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Old 12-20-2007, 10:40 PM   #5
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none at all. I think I might have purchased an FMU as opposed to a FPR
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Old 12-20-2007, 10:42 PM   #6
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courtesy of braineack
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Old 12-20-2007, 11:44 PM   #7
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if it doesn't read any pressure, it means you hooked it up right....techincally. becuase the return line should be void of pressure behind the FPR, once you get into boost and the FMU clamps down it should see some.
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Old 12-20-2007, 11:50 PM   #8
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Thank you much everyone....This diagram is exactly what I needed. I guess my FPR is the type that is boost activated.....It does not look like a traditional FMU....I will get a pressure gauge and attach it to the fuel line. Still not sure why the guage on the FPR is not working though.
In fact do I even need a FPR or FMU if I'm only going to boost 5psi with 315cc injectors? I've already have installed a Walboro 255 pump.
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Old 12-21-2007, 12:01 AM   #9
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Quote:
Originally Posted by MightyMouse View Post
Thank you much everyone....This diagram is exactly what I needed. I guess my FPR is the type that is boost activated.....It does not look like a traditional FMU....I will get a pressure gauge and attach it to the fuel line. Still not sure why the guage on the FPR is not working though.
In fact do I even need a FPR or FMU if I'm only going to boost 5psi with 315cc injectors? I've already have installed a Walboro 255 pump.
With 5 psi, that is about 150 to 160 hp. Using the calculations in the DIY sticky, that means you need about a 290cc injector. Since you have 315cc's there is no need for an FPR, just watch your A/F.

If it is a boost dependant FPR, then it needs to be hooked upto a vac line too. Take a picture of it, and well tell you what FPR you have.
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Old 12-21-2007, 12:36 AM   #10
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Old 12-21-2007, 12:38 AM   #11
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Old 12-21-2007, 12:39 AM   #12
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Old 12-21-2007, 08:24 AM   #13
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I have no clue what you have there...
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Old 12-21-2007, 09:58 AM   #14
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that FPR looks to be a replace for a stock unit.....
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Old 12-21-2007, 10:18 AM   #15
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you must delete the stock fpr in order to use this unit!!!... an fmu looks like a ufo and raises fuel based on boost pressures...the fpr on the other hand kinda does the same but not in a ratio like begi afpr/fmu or tradition vortec/obx fmu's...
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Old 01-04-2008, 11:19 PM   #16
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I have the same unit. How did it turn out? Any pictures of the finished product?
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