With a scan tool, it’s possible to verify if the modules controlling the fuel pump are receiving the correct data like oil pressure, crank position and key position.
Understanding fuel trims is the gateway to diagnosing common emissions problems. However, before we begin to use this information, specific criteria must be met in order for the PCM to gather accurate information.
All too often, technicians assume fuel pressure is “good” without actually measuring it. If the engine runs, they assume the injectors are getting adequate fuel pressure. If the engine cranks but won’t start, and they depress the service valve on the fuel rail and some fuel squirts out, then they assume the injectors have pressure.
Although cases involving contaminated gasoline are relatively rare nowadays, they still occur. In many cases, the technician has replaced the fuel pump or mass air flow (MAF) sensor to address a P0171/P0174 “lean-condition” DTC with no result. In all likelihood, the technician didn’t consider the possibility that the vehicle’s fuel might be contaminated with E85 gasoline, diesel fuel, stale gasoline, or, to a lesser degree, sugar and water.
Fuel pump replacement comebacks can be costly and can hurt your reputation. One of the leading causes of failure is the tank. If a vehicle gets 20 miles to the gallon, then more than 5,000 gallons of gas (from many stations) will go through the tank in 100,000 miles. And during this time, sediment, rust
Airtex Fuel Delivery Systems, a leading manufacturer of fuel pumps, is introducing a new pilot program focused on educating future technicians in the automotive industry. The Airtex PUMP•ED program will train student technicians across the country in the areas of fuel system diagnostics and fuel pump installations. Set to kick off in the fall of
In this excerpt, Bill Fulton current ramps the fuel pump on a high-mileage 2004 Dodge Status with P0300 and P0171 codes. In doing so, he determines whether there is a weak fuel supply or a bad pump. Watch Now.