Fuel Pressure regulator
#1
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?
#7
Boost Czar
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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.
#8
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.
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.
#9
Elite Member
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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.
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.
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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