1990-1993 Honda Accord Hi-Flow Fuel Rail Installation Instructions
Relieving fuel pressure
a) Remove the fuel fill cap.
b) On models equipped with a 6mm service bolt. (illustrated below) If your vehicle is not equipped with a 6mm service bolt, then proceed to step c.
i) Use a box end wrench on the 6mm service bolt on top of the fuel filter or fuel rail, while holding the special banjo bolt with another wrench.
ii) Place a rag or shop towel over the 6mm service bolt.
iii) Slowly loosen the 6mm service bolt one complete turn.
iv) Leave service bolt loose until all pressure has been relieved.
v) Tighten service bolt to 10 lbf-ft.
c) On models not equipped with a 6mm service bolt.
i) Use a box end wrench on the 12mm banjo bolt on top of the fuel filter.
ii) Place a rag or shop towel over the 12mm banjo bolt.
iii) Slowly loosen the 12mm banjo bolt one complete turn or until all pressure has been relieved.
iv) Torque the 12 mm banjo bolt to 25 lbf-ft.
Stock fuel rail, injectors and fuel pressure regulator removal
Refer to following vehicle-specific diagrams for proper disassembly.
a) Disconnect the fuel inlet fitting at the fuel rail.
i) Be careful not to lose either of the two crush washers.
b) Disconnect the wire connectors from the fuel injectors.
c) Disconnect the vacuum hose from the fuel pressure regulator.
d) Place a rag or shop towel over the fuel pressure regulator.
i) Remove the two 6mm retaining bolts.
ii) Position the fuel pressure regulator out of the way. (1) Be careful not to loose the o-ring that goes between the fuel rail and the fuel pressure regulator.
e) Loosen and remove the retainer nuts/bolts on the fuel rail, injector harness, and any other components that may be bolted to the fuel rail.
f) Disconnect the fuel rail.
g) Remove the fuel injectors from the intake manifold.
i) Some models have an injector insulator on the injector tip (the end of the injector that goes into the intake manifold) and some models do not. Note the arrangement your model has and be sure to reassemble the injector assembly correctly.
h) Inspect all seals, o-rings, and washers. If any of these components look at all worn or damaged, then replace with genuine Honda parts.
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