AEM 25-304BK Honda/Acura Adjustable Fuel Pressure Regualtor - Manual (Page 8)

b) When orifice changes are to be made, remove the fuel pressure regulator using the steps in section 4 in
reverse order. When this is completed, remove the six bolts from the top of the fuel pressure regulator and
use a 3/8” socket to remove the orifice in the regulator and replace with a different size orifice.
i)
When removing the six bolts from the top of the fuel pressure regulator a 9/64” allen key should be
used.
(1) Torque to 24 lbf-in.
(2) There is a constant pressure applied to the diaphragm by the spring inside the fuel regulator make
sure parts do not get lost upon removal of these bolts.
ii) When ever the regulator is disassembled check the diaphragm for any wear and tear, which may cause
a fuel pressure problem.
(1) If the diaphragm is damaged contact AEM to purchase a replacement diaphragm.
iii) When removing the orifice a 3/8” socket should to be used.
(1) Note: Be careful not to scratch or damage the surface of the orifice in any way, as it is a
precision ground surface for the diaphragm to seal on.
(2) Torque to 10 lbf-ft.
(3) There are three different size orifices supplied in the AEM fuel pressure regulator kit, which are
indicated by three different colors. Black = .100” Silver =.150” Gold = .200”
(4) Upon re-installation of the orifice use a light coat of oil on the threads to prevent galling.
iv) Re-assemble the fuel pressure regulator. Assembly diagram at the end of the instructions.
Shown below is a typical installation picture that can be used for reference.
Other applications are similar.
Torque to 9 lbf z ft
O-Ring
(Replace)
Fig. 1