msd ? www.msdperformance.com ? (915) 855-7123 ? fax (915) 857-3344 3-port competition fuel pressure regulator (return style) pn 29387 general information mallory's 3-port, return style regulator regulates fuel pressure between high pressure fuel pumps and carburetors or fuel injection systems. the regulator is recommended for mallory fuel 60fi, 110, 110fi, and 140 series electric fuel pumps. by returning excess fuel and fuel pressure to the fuel tank, this regulator benefts fuel pumps in several ways. the fuel pump will run cooler, draw less current and will always have full volume output available at the pressure setting. the fuel return line runs between the fuel return port of the regulator and the top of the fuel tank. the fuel tank must have provisions for a fuel return line. this regulator is equipped with a vacuum/boost compensation port (brass barb ftting) that can be used to momentarily decrease fuel pressure (vacuum compensation) at idle and part throttle, or increase fuel pressure under blower boost (boost compensation). while it is not necessary to connect a hose to the vacuum/boost compensation port, it may be benefcial in some cases. however, the small plug on the barb must be removed before use. 1 - kit, high pressure springs (not included with mallory fuel 140 series electric fuel pump kit part nos. 4142 and 4142a): 1 - medium spring (0.484" o.d.) 1 - large spring (0.640" o.d.) 1 - spring spacer/washer parts included: 1 - 3-port fuel pressure regulator, 3-12 psi 1 - bracket 1 - power module 2 - bracket mounting screws 1 - bypass spacer (to modify mallory fuel 110 and 140 series electric fuel pumps) important: this regulator must use a fuel return line. the fuel return line runs between the fuel return port of the regulator and the fuel tank. fuel pressures cannot be adjusted if the fuel return line is absent. specifications: port thread sizes (all): 3/8" npt adjustment range: 3-65 psi fuel application: part no. 4309, gasoline, automotive/street and racing applications; part no. 4310, alcohol/methanol, automotive/street and racing applications.
2 installation instructions mallory fuel 110 and 140 series electric fuel pump suggested modification only when using return style regulators (see figure 1) step 1 release the jam nut on the bypass plug. remove the bypass plug. remove the bypass spring and plunger. discard the bypass spring. step 2 inspect the bypass plunger. the bypass plunger surface should be clean and slide freely in the chamber. check the bypass plunger pad and remove any debris embedded in its surface. step 3 install the bypass plunger pad in the bypass plunger. install the bypass plunger and bypass spacer. clean the bypass plug. step 4 apply thread sealant compound on the bypass plug. you can fnd thread sealant compound at a hardware store. do not use tefon tape. step 5 install the bypass plug. gently tighten bypass plug until you feel it lock (torque to 5 in/lbs). install and tighten the jam nut. mounting procedure the regulator is ready for installation in applications requiring 3-12 psi fuel pressure ranges. applications requiring fuel pressure ranging from 10-65 psi (see figure 2) step 1 remove the four regulator cap screws and regulator cap. step 2 interchange the medium spring and spring spacer/washer for 10-40 psi fuel pressure ranges. interchange the medium spring, large spring, and spring spacer/washer for 35-65 psi fuel pressure ranges. step 3 install the regulator cap and the four regulator cap screws. torque regulator cap screws to 20 in/lbs. the regulator may be mounted at any angle. for maximum effciency, mount the regulator as close as possible to the carburetors or fuel injection systems. do not mount the regulator on or near exhaust manifolds. a bracket is provided for convenient mounting under an intake bolt. msd ? www.msdperformance.com ? (915) 855-7123 ? fax (915) 857-3344
installation instructions 3 fittings, fuel lines and fuel re - turn line the fuel return line should be as large, or larger, as the fuel line between the fuel pump and the regulator. see figure 3. purchase fttings (and plugs). use a thread sealant compound on the ftting threads. you can fnd thread sealant compound at a hardware store. do not use tefon tape. install the fttings. do not overtighten the fttings. this could damage the regulator. connect the fuel lines and fuel return line. see figure 4a-4d. msd ? www.msdperformance.com ? (915) 855-7123 ? fax (915) 857-3344
limited warranty msd warrants this product to be free from defects in material and workmanship under its intended normal use*, when properly installed and purchased from an authorized msd dealer, for a period of one year from the date of the original purchase. this warranty is void for any products purchased through auction websites. if found to be defective as mentioned above, it will be repaired or replaced at the option of msd. any item that is covered under this warranty will be returned free of charge using ground shipping methods. this shall constitute the sole remedy of the purchaser and the sole liability of msd. to the extent permitted by law, the foregoing is exclusive and in lieu of all other warranties or representation whether expressed or implied, including any implied warranty of merchantability or ftness. in no event shall msd or its suppliers be liable for special or consequential damages. *intended normal use means that this item is being used as was originally intended and for the original application as sold by msd. any modifcations to this item or if it is used on an application other than what msd markets the product, the warranty will be void. it is the sole responsibility of the customer to determine that this item will work for the application they are intending. msd will accept no liability for custom applications. msd ? www.msdperformance.com ? (915) 855-7123 ? fax (915) 857-3344 ? 2015 msd llc frm33319 revised 03/15 fuel pressure adjustment note: it is not necessary to have the engine running while setting fuel pressures with this type of regulator. do not exceed the fuel pump manufacturer's maximum recommended operating pressures. this could damage the fuel pump. (see figure 5 for mallory fuel series electric fuel pumps maximum recommended operating pressures.) step 1 remove and discard the plastic cap on the vacuum/boost compensation port. release the jam nut on the adjustment screw. remove the adjustment screw. step 2 turn on the fuel pump. check the fuel system for fuel leaks. check the fuel pressure with the adjustment screw removed. the pressure must be less than 3 psi. if not, a less restrictive return line must be used. turn off the fuel pump and correct any fuel leaks before proceeding. install adjustment screw. step 3 adjust fuel pressure. check the fuel system for fuel leaks. turn off the fuel pump and correct any fuel leaks before proceeding. install and tighten jam nut. mallor y fuel series vacuum/boost compensation port while it is not necessary to connect a hose to the vacuum/ boost compensation port, it may be benefcial in some cases. the vacuum/boost compensation port can be used to momentarily decrease fuel pressure (vacuum compensation) at idle and part throttle, or increase fuel pressure under blower boost (boost compensation). connect a hose between the vacuum/boost compensation port and a carburetor or intake manifold vacuum port to vacuum index the regulator. the set pressure of the regulator decreases about 1 psi for every 2 inches hg (2 inches on the vacuum gauge). connect a hose between the vacuum/boost compensation port and an intake manifold boost port to boost index the regulator. the set pressure of the regulator increases 1 psi for every 1 psi of boost. note: do-not exceed the fuel pump manufacturer's maximum recommended operating pressures. this could damage the fuel pump.
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