M:\Product Information\366-348\Instructions\366-348 MGB Fuel Injection Installation Instructions_Grant_2.doc
Installation Part 5 - Laying the Harness in Place
366-348 Inst Fig 21
21.1
366-348 Inst Fig 22
22.2
22.1
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
connectors that goes to the throttle body and one branch
with no connectors that goes toward the coil and fuse box. A
single red-white wire will go the new fuel pump we will install
by the rear axle.
64. Remove the right hand (passenger’s) under-dash panel
if fitted; many have been removed or lost. If you look up
at the back side of the firewall, you will see a rectangular
rubber grommet (21.1). We are going to modify it so we
can get the fuel injection harness into the cockpit.
65. Pop out the rectangular grommet (21.1) from the hole in
the right side of the firewall.
66. Cut a 1” hole in the plug using a hole saw (22.1). Avoid
the middle rib. Slice the grommet from the hole to the
bottom edge of the grommet using a single edge razor
blade. (22.2) If you don’t have a hole saw you can cut
the hole with an Exacto knife, razor blade or punch.
67. Find the end of the wiring harness (23.1) with the two
large rectangular white plastic connectors or plugs
(23.2).
68. From the engine compartment, poke about 1 foot of the
harness through the hole in the dash.
366-348 Inst Fig 24
366-348 Inst Fig 23
23.2
23.1
23.2
24.1
69. Leave the harness hanging in the footwell for now
(24.1). We just want to make sure we have enough
slack to reach the ECU when we install it later.
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