Diagnosing Pulse-Width Modulated PWM Fuel Pumps
Here are five things you should know about pulse-modulated fuel delivery systems.
VIDEO: Three Tips To Extend Fuel Pump Service Life
Andrew Markel offers three tips to extend the service life of a new fuel pump, including cleaning out the fuel tank, replacing fuel filters, and diagnosing and solving driveability problems.
VIDEO: Fuel Pump Replacement On GDI Engines
Andrew Markel offers several tips to make a GDI fuel pump replacement job easier and safer.
Top 10 Fuel Pump Fails
Ten problems to be aware of when a vehicle’s fuel pump fails.
VIDEO: Fuel Hose And Fuel Pump Replacement
Andrew Markel stresses the importance of choosing the right fuel hose type for its application on a vehicle.
Automotive Fuel Pump Returns Stink. Literally
The same aroma of fuel that gets our adrenaline pumping at the local race track gives us a distinctly different feeling when we smell it at the front counter.
Subaru Pulse-Width Modulated Fuel Pumps
Many technicians aren’t familiar with PWM fuel pumps because they’re generally very reliable. But now that many import vehicles equipped with PWM fuel pumps are rolling up the miles, it’s time to turn the page from diagnosing two-line and single-line mechanically pressure-regulated fuel pumps to diagnosing electronically controlled PWM fuel pumps.
Automotive Fuel Pumps Continue To Evolve
On most applications, the pump runs at a constant speed (typically 3,000 to 7,000 RPM depending on the design). However, on many newer vehicles pump speed is controlled by the PCM and will vary depending on engine load and speed. The most common type of electric fuel pump today is the turbine style pump. An impeller ring with many small blades is attached to the electric motor inside the pump.
Tech Tip: Fuel Pump Float Arm Assembly
The float arm is shipped loose to avoid unnecessary damage and disruption during installation. The undamaged float arm assembly should be properly mounted to the fuel level sender before installing the pump module into the fuel tank.
A Clean Fuel Tank Improves A Fuel Pump’s Diet
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
