Fuel pressure relief procedure Ford F150
Warning: Gasoline is extremely flammable, so take extra precautions when you work on any part of the fuel system. Don’t smoke or allow open flames or bare light bulbs near the work area, and don’t work in a garage where a gas-type appliance (such as a water heater or a clothes dryer) is present. Since gasoline is carcinogenic, wear fuel-resistant gloves when there’s a possibility of being exposed to fuel, and, if you spill any fuel on your skin, rinse it off immediately with soap and water. Mop up any spills immediately and do not store fuel-soaked rags where they could ignite. The fuel system is under constant pressure, so, if any fuel lines are to be disconnected, the fuel pressure in the system must be relieved first. When you perform any kind of work on the fuel system, wear safety glasses and have a Class B type fire extinguisher on hand.
Note: After the fuel pressure has been relieved, it’s a good idea to lay a shop towel over any fuel connection to be disassembled, to absorb the residual fuel that may leak out when servicing the fuel system.
FPDM is located on the frame crossmember, forward of the rear axle and above the fuel tank
1. Unplug the Fuel Pump Driver Module (FPDM) electrical connector.
2. Start the engine and allow it to run until it stops. This should take only a few seconds.
Warning: On 2017 and earlier 2.7L and 3.5L models and all 2018 and later models, the fuel pressure is relieved on the low-pressure side of the system, but pressure will still remain in the high-pressure side of the system. Before loosening any connections on the high-pressure side of the system, wait at least two hours.
3. The fuel system pressure is now relieved. Disconnect the cable from the negative terminal of the battery before performing any work on the fuel system.
4. When you’re finished working on the fuel system, simply reconnect the electrical connector to the FPDM.