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on the fuel rail there are two metal pipes that deliver fuel to injectors, the thicker one is the fuel feed hose and the thinner is the fuel return on the thicker pipe, start at rail and work your way down about 10 to 14 inches. i think the pressure check port is on pass side (right side) keep look out for the test port to check fuel pressure it looks like a small tire valve cap like on your tires remove black cap and you will see the same schrader valve you would see when you let air from you tires when you push down on the pin, fuel will come out do this with a cool engine and battery neg cable off fuel is highly volatile. wrap a old towel around valve so fuel does not get all over, and depress pin until fuel stops coming out be careful your dealing with about 45 lbs of initial pressure and wear eye protection no smoking no drop lights just a flashlight is ok you can also remove the valve just like a tire valve insert just use a valve extracter tool good luck g

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Q: How do you relieve the fuel pressure on a ford e-150 5.8?
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