VIDEO: Replacing Fuel Pump To Solve Slow Acceleration
A customer comes in a complains about not being able to speed up quickly when applying gas. Your first thought might be to change the fuel pump, but sometimes that isn’t enough. Andrew Markel explains how it could be an internal leak.
VIDEO: Where Have The Fuel Pump Filters Gone?
Andrew Markel discusses how to diagnose a fuel pump, and the importance of replacing the entire module if the pump is failing.
Fuel Pump Codes And Control: Keeping Pressure In The Zone
The first electric fuel pump circuits were very simple. The pump circuit usually involved a relay and fuse. The control side to the relay was typically wired to an ignition circuit or key switch. The control of the fuel pressure was performed with an analog regulator that could keep a static pressure and adjust for loads with a vacuum signal.
Top EVAP Tips When Replacing Fuel Pumps
Nothing is worse that an EVAP code after a fuel pump has been replaced. Discovering that the tank needs to be dropped again to address a problem can kill shop productivity and profitability. Keep reading for tips that can help you avoid comebacks and dropping the tank for a second time.
Pulse-Width Fuel Pump Diagnostics
You will see only one fuel line going to the fuel rail on most late-model vehicles. Instead of using an engine vacuum routed to a pressure regulator under the hood, returnless systems use engine data and vary the speed of the electric pump to meet fuel pressure and volume requirements without having to bleed off and return it to the tank when the engine does not need it.
VIDEO: Fuel Pump Voltage; Different Numbers On Different Tools?
Andrew Markel discusses the current used to drive fuel pumps, and how measuring it with a suite of diagnostic tools can determine the component’s health.
VIDEO: Checking The Voltage On A Fuel Pump
Andrew Markel explains how modern vehicles have pressure sensors that send out a voltage signal, and how a diagnosis can be made by measuring the signals with a scope.
VIDEO: Extending Fuel Pump Life
Andrew Markel discusses cleaning the fuel tank and how it can improve the life of the fuel pump.
Fuel Pump Pressure: Optimal Flow Factors
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.
VIDEO: Wiring Harnesses On New Fuel Pumps
Andrew Markel explains why you should install the wiring harness that comes with a new fuel pump, even if there is not a problem with the old one.
