Fuel Delivery and Air Induction: Service Precautions

Safety precautions when working on fuel supply system

CAUTION! Fuel system is under pressure! Wear eye protection and protective clothing in order to avoid injuries by contact with fuel. Before removing from hose connection wrap a cloth around the connection. Then release pressure by carefully pulling hose off connection.





- For safety reasons, fuel pump relays -1- (for right side) and -2- (for left side) must be removed before opening fuel system because fuel pump can be activated by opening the drivers door.

Always observe the following when removing and installing the sender for fuel gauge or the fuel pump (fuel delivery unit) from full or partially filled fuel tanks:
- Already before starting work, switch on exhaust extraction system and place an extraction hose close to the sensor installation opening of fuel tank to extract escaping fuel fumes. If no exhaust extraction system is available, a radial fan (as long as motor is not in air flow) with a displacement greater than 15 cubic meters/hour can be used.
- Prevent fuel from contacting skin! Wear fuel-resistant gloves!

CAUTION! When doing any repair work, especially in the engine compartment, pay attention to the following due to clearance issues:
Route lines of all types (e.g. for fuel, hydraulic, EVAP canister system, coolant and refrigerant, brake fluid, vacuum) and electrical wiring so that the original path is followed.
To prevent damages to the lines, make sure there is sufficient clearance to all moving or hot components.