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. Sponsored by Auto Value and Bumper to Bumper.
Smart Fuel Pump Diagnostics
If you are diagnosing a “cranks but does not run” or a “lean/stumbling under load” complaint, your first instinct might be a problem with the fuel pump. But, how do you assess the condition of the fuel pump without taking it apart?
US Motor Works Releases New Professional Series Fuel Pump Modules
The expansion includes 25 new fuel pump modules that are in stock and ready to order.
Acura Tech Tip: Chirping From High-Pressure Fuel Pump
With the hood open, listen for a chirping noise with the engine warmed up. If the noise is coming from the high-pressure fuel pump, follow the Repair Procedure in this Tech Tip.
Giving It The Gas: When The Fuel Pump Isn’t The Problem
The most famous last words in automotive diagnostics are, “We’ve always done it this way.” In many cases, “always done it this way” consists of diagnosing a fuel pump by squirting some type of liquid or gaseous hydrocarbon into the air intake. Case in point, a 2011 Nissan Rogue had suddenly stalled on a busy summertime highway.
Rethinking Fuel Pump Diagnostics And Sensors
The technician diagnosed the 2011 Rogue as a bad fuel pump by squirting propane into the air intake. With propane, the engine runs, without propane, it stalls. But, after the fuel pump was replaced, the Rogue exhibited the same problem, which was a very slow, unsteady idle followed by an engine stall.
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. Sponsored by Auto Value and Bumper to Bumper.
VIDEO: Extending Fuel Pump Life
Andrew Markel discusses cleaning the fuel tank and how it can improve the life of the fuel pump. Sponsored by Auto Value and Bumper to Bumper.
BMW Extended Warranty On S63 Direct Injection High-Pressure Fuel Pumps
BMW has extended the warranty on the high-pressure fuel pump for the 2012 X5 M and X6 M models with the S63 engine. The warranty covers the pump for 10 years or 120,000 miles. BMW is not recalling the pump and no reason was given for the extension of the warranty.
