When no fuel is supplied, your engine will suddenly stop and will not restart until pumping is restored. With insufficient fuel your engine will run very poorly. One troublesome event with this system can be the fuel pump failing to either pump sufficient fuel or any fuel at all. And occasionally it happens to your fuel delivery system.

See Also: Fuel Gauge Reading Incorrectly? (Causes and How to Fix) Fuel Pumps Can Failīut it’s not a perfect world. When it’s working well, your engine will start quickly and run with remarkable enthusiasm. At high pressure, the fuel will be sprayed into the engine through precisely timed fuel ports called fuel injectors. Under the hood, a second electric or engine-driven mechanical pump is used in many cars to boost fuel pressure. The pump pressurizes the fuel and pushes it through the piping. You may hear its tell-tale whirring sound. From your car’s fuel tank, metal piping conveys fuel to the engine.Īn electric fuel pump, generally located inside the tank, clicks on when you start the engine and the vehicle’s ECM instructs the fuel pump relay to turn it on. How does this fuel delivery system operate? In principle it’s quite simple. Diagnostic Fault Codes: How They Help You.How the Onboard Diagnostic System Works.An Early Warning from Your Instrument Panel.#8 – Poor Performance When Climbing a Hill.#6 – Engine Speed Variations While Driving at a Steady Speed.

#3 – Rough Running at Idle and Low Speed.#1 – Difficulty Starting (or Can’t Start at All).

Signs of a bad fuel pump module