![]() ![]() ![]() If you don’t have one like this, you can also simply hold a rag over the test port and use something skinny to press the valve in on the test port, but see the warning below… Fuel rail test port – Buick Grand National I happen to have a Craftsman fuel pressure gauge that has a release button (with a little offshoot hose), so I connected that to the test port of the fuel rail on the engine, and released any residual pressure it had safely into a container. Since a fuel injection system is usually under pressure, the first thing is to release the pressure off the system if the car has recently been run. I just drove the car until it appeared to be empty, and found that indeed it only had a couple gallons left. Before I started draining the tank, its always better to use up as much gas as you can first, as you’ll need to temporarily store any gas from the tank. ![]()
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