So, the function of fuel systems, is to store and deliver fuel, to the engine as needed.
Furthermore, as the fuel is delivered, it must also be, atomized and have the correct, spray pattern.
In addition, the fuel needs to be, under a certain pressure and volume, for proper combustion to take place.
Consequently, fuel systems can be, one of two different types. Either, the return type or return less type. But, the big difference is, how they are actually regulated.
Return type system
So, a return type system, has a fuel pressure regulator, that varies the fuel pressure. But, is based on the amount of vacuum, from the intake system. This is so, the amount of fuel pressure and flow reaching the injectors, remains consistently the same.
Return less system
Whereas a return less type system, uses the powertrain control module (PCM) to regulate fuel delivery. As a result, when the fuel pressure and flow starts to drop, due to increase of engine speed or load. Consequently, the (PCM) compensates by, increasing injector duration and/or operating speed, of the fuel pump.
Signs of failing fuel systems include:
- Difficult Engine Starting.
- Slow or Hesitation at Acceleration.
- Stalling While Driving.
- Intermittent Power Loss.
- Check Engine Light or Service Engine Soon Light Illuminated.
- Engine Idling Rough.
- Excessive Engine Smoke.
- Noticeable Fuel Odors.
- Decreased Fuel Economy.
Choose Your Fuel Systems Help Topic Below
Electronic Fuel Injectors – Are Used To Convert Fuel Into A Fine Spray
Fuel Pressure Regulator – Controls The Exact Amount Of Fuel Pressure
Fuel Pump Relays – Allows Current Through To The Fuel Pump
Automotive Fuel Pumps – Deliver Fuel From The Fuel Tank To The Engine
Gasoline Direct Injection (GDI) – New Technology Causes New Problems
Fuel Leak – If You Smell Fuel This Could Be A Sign Of A Fuel Leak
Fuel System Related Problems – Not Always Easy To Solve
Poor Fuel Economy – Little Tricks That Will Help In Boosting Your Mileage
Fuel Pump Related No Start Problems – What Should You Check
Excessive Fuel Consumption – Common Causes And Cures
Fuel Getting Into Engine Oil – Causing Premature Wear Of Engine Parts
Fuel Wash – How To Eliminate This Potentially Serious Problem
Reducing Fuel Consumption – Keep More Money In Your Pocket
Hard Starting Engine – Cold, Hot, Both Or Just After Refueling
Engine Fuel System Testing – Proper Testing With Solutions
Gas Getting Into Oil – What Can Cause This To Happen ?
Oxygen Sensors (O2) – They Monitor The Levels Of Fuel Mixture
Automatic Shutdown (ASD) Relay – Function – Failure – Testing
Fuel Pump Issues – Excessive Heat – Contamination From Dirt and Rust
Loose Gas Cap – Evaporative Emission Control System (EVAP) Self Test
Thank You !