Once the pressure is released, I removed the valve needle from the test port (you can do this using a fine pair of needlenose plyers, or a schrader valve removal tool), and connected a piece of long 5/8″ hose to the port, with the other end going to a gas can. Warning: The fuel rail can have 40+ PSI of pressure in it – you MUST use caution here, as gasoline will not only spray out of it, but any nearby spark can also ignite it! ![]() 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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