Saturday, February 15, 2014
How Do I Install Fuel Injection on a 350 Chevy
A 350 Chevy can be any engine in a Chevrolet vehicle with a displacement of 350 cubic inches. The last version of this engine was the Vortec 5700, which appeared in full-size Chevrolet trucks from 1996 to 2002. The 350 Chevy engine used central sequential fuel injection, which fires the fuel injectors in a specific order. The installation procedure for the fuel injectors is the same for all trucks with a 350 Chevy engine made after 1998.
Instructions
- 1
Turn the ignition off and remove the cable from the negative battery terminal with a socket wrench. Open the filler cap on the fuel tank to release the fuel tank pressure.
2Wrap a shop towel around the pressure fitting on the fuel rail and connect a fuel pressure gauge to the pressure fitting. Place the free end of the bleed hose of the pressure gauge into a container suitable for gasoline. Open the valve on the pressure gauge to relieve the fuel system pressure and disconnect the fuel pressure gauge from the pressure fitting.
3Detach the electrical connectors from the fuel pipes on the engine. Disconnect the fuel send and return lines from the fuel pipes with a socket wrench and discard the O-rings for the fuel lines. Remove the upper intake manifold from the engine with a socket wrench. Release the lock tabs on the fuel meter and disconnect the fuel meter from the engine.
4Remove the retaining nuts on the lower hold-down plate for the fuel injectors with a socket wrench and disconnect the hold-down plate. Pull the nozzle of each fuel injector down as you push a small pry tool between the electrical terminals of the fuel injector. Pry the injector out of its socket on the fuel meter and discard the O-ring on the fuel injector.
5Lubricate the O-rings for the fuel injectors with engine oil and mount the new O-rings to the new fuel injector. Install the new fuel injector to its socket on the fuel meter. Attach the lower hold-down plate and tighten its retaining nuts to 27 inch-pounds with a torque wrench.
6Connect the fuel meter to the intake manifold and tighten the retaining bolts to 88 inch-pounds. Attach the lock tabs for the fuel meter bracket to secure the fuel meter in place. Connect new electrical connectors for the fuel injectors. Mount new O-rings on the fuel lines and attach the fuel lines to the fuel pipes on the engine. Tighten the retaining nuts for the fuel lines to 22 foot-pounds with a torque wrench.
7Turn the ignition on for two seconds, then turn it off for 10 seconds to pressurize the fuel system. Turn the ignition back on and correct any fuel leaks.
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