Fuel pumps, in any vehicle, only have one job, and that is; to deliver fuel from the tank to the engine.
So, in the old days, with carbureted systems, most pumps were only mechanical.
But, today, with electronic fuel injection systems, they require higher fuel pressures; only accomplished, in part, by using an electric pump.
Consequently, the location of fuel pumps has changed over the years as well.
Meanwhile, an older, inline mechanical pump, was mounted on the engine. So, the pump moves, as your camshaft spins and fuel is drawn, through a line using suction. However, today fuel injection systems, have the pump mounted, inside the fuel tank.
Fuel travels through the fuel line and toward the carburetor or the cylinder:
- So, in a carbureted engine, fuel is injected with air and forms, a mixture in the carburetor.
- However, in a fuel-injected engine, fuel and air don’t mix, until they reach the cylinder.
Common Failure Signs Include:
- Difficulty Starting The Engine
- Whining Noise From the Fuel Tank
- Engine Sputters or Surges
- Loss of Power Under Load
- Reduced Gas Mileage
- Stalling at High Temperatures
- Increased Engine Temperature
Finally, the pump is not part of a regular maintenance schedule. Therefore, only when it fails, it will need replacement. Most pumps should last well past 100,000 miles.
Choose Your Help Topic Below
Failure – Warning Signs – Common Causes – Failure Symptoms
Common Issues – Excessive Heat – Contamination From Dirt and Rust
Fuel Pump Related No Start Problems – What Should You Check
Electric Fuel Pump – How Do They Work – How Can They Fail
Related Problems – Not Always Easy To Solve
Hard Starting Engine – Cold, Hot, Both Or Just After Refueling
Engine Fuel System Testing – Proper Testing With Solutions
Mechanical Pump – Basic Information And Troubleshooting
Fuel Pump Diagnosis Tips from Carter (PDF file – requires Adobe Acrobat Reader to view).
Thank You !