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If you're lucky the fuel system will a have Schrader-type or similar access valve to easily and quickly tap into fuel pressure with the gauge and supplied kit adapters. Our luck had run out in the case of this throttle body injected Mitsubishi Starion. A few brass fittings, some fuel injection line, and fuel injection hose clamps were required to fabricate an adapter.
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The service manual will reveal the test fitting location or where to tap into the fuel system. In this case, removal of a threaded plug was required to thread in the adaptor. If tapping directly into the fuel system, either relieve pressure first or be prepared for high-pressure fuel
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Some vehicles will energize the fuel pump with the key turned to ignition. Others have a jumper port. If neither of these options is available then connect the gauge and start the vehicle. Be ready to turn the engine right back off in case of fuel leaks. Monitor pressure at idle.
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Another test is to watch fuel pressure while increasing the rpm of the engine by manually opening the throttle. The service manual will tell you what's supposed to happen. In this case the pressure is supposed to remain steady.
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Disconnect the tester. Be prepared for pressurized fuel with a rag or catch container. If the engine is hot wait until things cool down first.
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