The __ design uses a one-way valve to hold pressure in the system while the pressure tester is connected and disconnected to the fuel rail. a. O-ring valve b. Quick-connect valve c. Schrader valve d. Fuel pressure tester valve

## Step 1<br />The problem is asking us to identify the type of valve that uses a one-way valve to hold pressure in the system while the pressure tester is connected and disconnected to the fuel rail. The options provided are O-ring valve, Quick-connect valve, Schrader valve, and Fuel pressure tester valve.<br /><br />## Step 2<br />The Schrader valve is known for its one-way valve design. This valve is commonly used in tire inflation systems, but it is also used in fuel systems to hold pressure in the system while the pressure tester is connected and disconnected to the fuel rail.<br /><br />## Step 3<br />The Schrader valve is designed to allow air to enter the tire when the valve is depressed, but it prevents air from escaping when the valve is released. This is the same principle that applies to the Schrader valve in a fuel system.