Fuel Pumps And Voltage Drop – Still A Valid Test
Voltage drop testing compares the battery or charging voltage to the voltage at the component.
Pulling Codes: Multiple Misfire Personalities
The vehicle appeared to run fairly well at idle, but when taken for a test drive, did not perform well. We crack the code.
VIDEO: Clean The Fuel Tank Before Replacing The Pump
Sediment, rust and debris from the pump can get into the tank and kill the fuel pump. This video is sponsored by Carter.
VIDEO: Fuel Pump Level Sender Operation
How do modern gas gauges stay still when the gas in your tank moves around? This video is sponsored by Carter.
Driveability Diagnostics And Direct Injection
Direct injection can be a diagnostic challenge, but with the right foundation, problems can be solved profitably.
Fuel: It’s The Tank, Not The Pump
One of the most basic procedures when replacing a fuel pump – and often the most overlooked – is inspecting the fuel tank.
Air Filter And Fuel Trim Diagnostics
The modern engine measures two things extremely well, the amount of air going into the combustion chamber with the mass airflow sensor (MAF), and the byproducts that are generated by the combustion event with the oxygen sensor. These measurements allow the engine’s computer to put the right amount of fuel and spark into the cylinder to give the most efficient and cleanest combustion event.
The Carbon Deposit Conundrum
Engine carbon deposits have been around for more than 100 years. They start out as fresh oil and gasoline. The engine uses heat, compression and combustion to turn most of the fuel into power. But, during some combustion events, a droplet of fuel or oil is transformed into a substance that can become a carbon deposit. This typically happens when there are conditions that are outside of the normal operating conditions.
Direct Fuel Injection Diagnostics
Direct injection is becoming standard on more and more late-model vehicles. These systems can be a diagnostic challenge but, with the right foundation, problems can be solved profitably.
VIDEO: Diagnosing Fuel System Leaks In GDI Systems
Jason Stahl discusses gasoline direct injection systems, and ways to prevent leaks in the system after a fuel pump or injector have been replaced. Sponsored by Standard.
The Oil And Carbon Deposit Connection
Oil is made of carbon atoms. The oil in the crankcase is a highly refined carbon-based substance that is found in long chains with strong bonds that are typically uniform in size and shape. They work well together to lubricate the engine and protect the bearings, as they are engineered to withstand extreme temperatures.
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.
