F 350 4WD Pickup V8-351 5.8L VIN H EFI (1997)
Fuel Return Line: Service and Repair
FUEL AND VAPOR RETURN TUBES
REMOVAL
WARNING: Most connections in the evaporative emission system are very secure. A strong pulling and simultaneous twisting action is
required to disconnect. When disconnection occurs, both hands can sharply and uncontrollably move in the direction of each hand's pulling. Be
careful that no sharp or possibly damaging objects are in line with the direction of pull to prevent physical injury or damage to the objects that
will be impacted by the hands when disconnection occurs.
1. Grip component securely with one hand and tube with the other hand, as close as possible to connection.
2. Sharply twist tube along its axis to "break" the temporary bond between tube and component. (No adhesive is used to make tube connections
during vehicle assembly, but natural aging of the connections causes a temporary bond to exist.)
3. It is important to "break free" the tube at its connection point as indicated in Step 2. If the joint is stubborn and the above method does not work,
grip the tube with a pair of pliers directly over the joint and twist again.
4. Once the tube/component joint has been broken, disconnect by gripping the component securely with one hand and hose with the other. Twist tube
and, at the same time, pull apart.
INSTALLATION
1. To reconnect a tube to a component, wet the tube with water and push onto component.
2. Vapor tubes should be assembled with the minimum engagement shown in the illustration.