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M:\Product Information\366-348\Instructions\366-348 MGB Fuel Injection Installation Instructions_Grant_2.doc
366-348 Fuel Injection Conversion
Installation Instructions
1975-1980 MGB
with a Zenith Stromberg Carburetor
CARB E.O. Number D-453-4 (75-79)
Introduction
The US Spec MGBs built from 1975 on were designed around the emissions standards adopted by the
United States. The engine and the emission control components constitute a single system that work
together to
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M:\Product Information\366-348\Instructions\366-348 MGB Fuel Injection Installation Instructions_Grant_2.doc Tools Needed Safety Goggles Extensions, long, medium, short Rubber gloves Torque Wrench. 3/8" drive Electrical tape Allen wrench 5 mm Masking tape Gasket scraper Black felt pen/marker (Sharpie) Locking pliers (vice grips) Pencil Hacksaw Penetrating oil Dremel tool or grinder Brake Cleaner (aerosol) Fuel Siphon pump Gasket dressing (Hylomar or RTV) Fuel storage co
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M:\Product Information\366-348\Instructions\366-348 MGB Fuel Injection Installation Instructions_Grant_2.doc Installation Part 1 – Prepare the Vehicle, Drain Fluids 1. Disconnect the battery ground cable. 2. You will need a solid, level surface to work on. 3. Jack up the rear end of the car and support is securely on two jack stands. 4. Drain the fuel tank. The safest method is to use a fuel siphon pump to transfer the fuel into a proper gasoline storage container. The origi
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M:\Product Information\366-348\Instructions\366-348 MGB Fuel Injection Installation Instructions_Grant_2.doc 2.3 11. Locate the water choke on the ZS Carb (2.2). 2.2 12. Loosen the hose clamp and disconnect the coolant hose that runs from the water choke (2.3) to the water choke outlet at the back of the cylinder head. 13. Loosen the hose clamp and disconnect the coolant hose that runs from the water choke (2.4) to the steel coolant line (2.6) that runs next to the ex
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M:\Product Information\366-348\Instructions\366-348 MGB Fuel Injection Installation Instructions_Grant_2.doc 18. Locate the hose (6.1, 6.2) that runs from the carb to the crankcase vent pipe (6.3) on the front of the engine. 19. Loosen the hose clamp at the carb and disconnect the hose. 6.1 6.2 366-348_Instructions_Fig 6 20. Loosen the hose clamp at the crankcase vent pipe (6.3) and remove the hose. This hose will be replaced by a
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M:\Product Information\366-348\Instructions\366-348 MGB Fuel Injection Installation Instructions_Grant_2.doc 24. On the back of the carb, locate the throttle cable (9.1) and the bellcrank (9.2) 25. Disconnect the throttle cable (9.1) and let it hang loose as shown in Fig 9. The throttle cable is secured to a 9.2 bracket on the heat shield and that will be removed shortly. 9.1 366-348 Inst Fig 9 26. Remove the four nuts that secure the carb to
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M:\Product Information\366-348\Instructions\366-348 MGB Fuel Injection Installation Instructions_Grant_2.doc 34. Locate the nut (11.3) securing the heat shield bracket (11.4) to the stud (11.5) on the heater return pipe. Remove the nut and save it-we will need it later. 35. Remove the heat shield bracket (11.4) and the heat shield (11.6) by pulling it up and off the 4 carburetor studs and the stud (11.5) on the water pipe. Set it aside. 11.3 11.4 11.5 11
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M:\Product Information\366-348\Instructions\366-348 MGB Fuel Injection Installation Instructions_Grant_2.doc Installation Part 3-Modification of the Heat Shield The heat shield will be modified and reinstalled with the fuel injection throttle body. Although it is possible run a car with the fuel injection system installed without the heat shield, the under-hood temperature will be quite high, and we strongly recommend against it. 41. Remove the two Phillips head screws (1
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M:\Product Information\366-348\Instructions\366-348 MGB Fuel Injection Installation Instructions_Grant_2.doc 46. Cut the bracket to remove the 3.5” long section of the lip or flange from both sides (17.1, 17.2). You 17.1 17.2 can make the cuts with a hacksaw. You can also use a grinder, jig saw, or a Sawzall instead of a hacksaw. 47. Lightly file the edges where both cuts were made to remove any burrs. At this point you may want to repaint the bracket. Strip the rest
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M:\Product Information\366-348\Instructions\366-348 MGB Fuel Injection Installation Instructions_Grant_2.doc 18.1 Installation Part 4 - Fitting the Throttle Body 49. Pick up the throttle body. Note that one of the four mounting bolts has already been installed, and the throttle stop was installed afterward. This effectively traps the bolt. NOTE: The throttle stop has been preset and the Electronic Control Unit (ECU) has been calibrated using this throttle stop. UNDER NO CI
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M:\Product Information\366-348\Instructions\366-348 MGB Fuel Injection Installation Instructions_Grant_2.doc 58. Hang the modified heat shield assembly in position, (with the gasket toward the manifold) using the stud on the water pipe to support the heat shield. The four bolt holes in the heat shield should line up with the four holes in the manifold. Replace the nut on the stud on the water pipe loosely- we just want to keep the heat shield assembly in 20.1 position. 59.
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M:\Product Information\366-348\Instructions\366-348 MGB Fuel Injection Installation Instructions_Grant_2.doc Installation Part 5 - Laying the Harness in Place The brain of the fuel injection system is the Electronic Control Unit, or ECU. This will live in the cockpit. The wiring for the kit consists of a single harness that starts in the cockpit and it has one branch with several molded plastic 21.1 connectors that goes to the throttle body and one branch with no connectors
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M:\Product Information\366-348\Instructions\366-348 MGB Fuel Injection Installation Instructions_Grant_2.doc 70. Locate the branch of the harness that has the relay 25.2 25.2 (25.1) and the inline fuse holders (25.2), and route it over to the right hand side of the engine compartment. Although missing in this particular picture, we encourage the use of fender covers or towels to protect the paint. 71. Locate the branch of the harness with the molded plastic 25.1 conne
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M:\Product Information\366-348\Instructions\366-348 MGB Fuel Injection Installation Instructions_Grant_2.doc Installation Part 6 - Connecting the Harness to the Throttle Body 73. Locate the connector on the harness for the 366-348 Inst Fig 26B Idle Air Control Motor and plug it in. (26.1) 366-348 Inst Fig 26C 74. Locate the connector on the harness for the Fuel Injector and plug it in. (26.2) 26.1 26.1 75. Locate the connector on the harness for the Throttle
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M:\Product Information\366-348\Instructions\366-348 MGB Fuel Injection Installation Instructions_Grant_2.doc Installation Part 7 – Installing the Manifold Absolute Pressure (MAP) Sensor The MAP sensor is a variable resistor used to monitor the 27.1 difference between the pressure inside the intake manifold and normal atmospheric pressure outside the manifold. This information is used by the electronic Control Unit (ECU) to determine engine load. When the engine is under
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M:\Product Information\366-348\Instructions\366-348 MGB Fuel Injection Installation Instructions_Grant_2.doc Installation Part 8 - Engine Coolant Temperature (ECT) Sensor 85. Locate the factory water choke outlet at the left rear corner of the cylinder head. When cars are converted to a manual choke, this outlet is sometimes removed. If 30.1 yours is missing, you will need a Moss #470-245 water choke outlet because engine coolant must flow past the ECT in order for it to
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M:\Product Information\366-348\Instructions\366-348 MGB Fuel Injection Installation Instructions_Grant_2.doc 92. Locate the two 1/4-28 x 2” studs supplied in the kit. 93. Apply thread sealant (Permatex 54540 or equivalent) to the last ¼ inch of each stud. (Fig 37) 94. Thread the ends of the studs with sealant into the holes at the back of the head. (Fig 38) 366-348 Inst Fig 37 366-348 Inst Fig 38 95. Locate the two water choke outlet gaskets (Moss p/n 295-040) sup
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M:\Product Information\366-348\Instructions\366-348 MGB Fuel Injection Installation Instructions_Grant_2.doc 104. Find the fuel injection harness connector with the blue inner seal (47.1) Connect it to the to the ECT sensor. The clip on the connector (47.2) should snap 47.2 into place. 47.1 366-348 Inst Fig 47 105. Locate the 22” long piece of 3/8” heater hose supplied in the kit (Moss #051-260). Slide a small hose clamp (supplied in kit) over the
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M:\Product Information\366-348\Instructions\366-348 MGB Fuel Injection Installation Instructions_Grant_2.doc Installation Part 9- Tapping into the Tachometer Wire 108. If you have a “Federal” MGB (built for sale outside California) you should have a cylindrical barrel-type coil 60.1 (60.1). Locate the two white w/black stripe wires attached to the negative side of the coil (60.2). Look at the coil; the negative side of the coil should be marked with a “-“. One white w/black
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M:\Product Information\366-348\Instructions\366-348 MGB Fuel Injection Installation Instructions_Grant_2.doc Installation Part 10- Terminating & Connecting the Fuel Injection Harness 113. Organize the various electrical connectors supplied 65.4 in the kit. 65.6 114. Find the two black wires that have inline fuses (65.1, 65.2). These are the fuel injection harness power leads. 115. Strip the ends and crimp one female spade connector (65.3) onto each of these two wir
