Fuel Systems - Delivers Fuel To The Engine As Needed
Fuel Systems – Delivers Fuel To The Engine As Needed

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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

Loose Gas Cap – Evaporative Emission Control System (EVAP) Self Test


Fuel Systems – Delivers Fuel To The Engine As Needed

So, The function of fuel systems is to store and supply fuel to the engine.

Also, there are some things that happen in the intake system:

  • Fuel needs to be mixed with air
  • It has to be atomized
  • And finally vaporized

So, All systems are the same in that they must supply fuel to the combustion chamber. Furthermore, As the fuel is delivered, the final conditions for providing complete combustion are; atomization and the spray pattern of the fuel. As a result, The spacing, angle and number of holes in the injector tip determine the spray pattern. Depending on whether your vehicle’s fuel system is a return type or returnless type system; the fuel pressure is regulated differently.

So, A return type system has a fuel pressure regulator that varies the fuel pressure. And furthermore, 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. Whereas a returnless type system uses the powertrain control module (PCM) to regulate fuel delivery. 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.

The basic symptoms that a fuel system that is showing signs of wear or deterioration are:

  • 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

So, The main components of the fuel system include:

  • Fuel Tank
  • Fuel Pump
  • The Fuel Filter
  • Fuel Injector
  • Carburetor

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