* Engine sputtering or hesitation, especially under acceleration: This is a classic sign. The engine isn't receiving enough fuel to maintain consistent power.
* Engine stalling: The pump may be unable to deliver sufficient fuel to keep the engine running, leading to stalling, particularly when idling or accelerating.
* Difficulty starting: The engine may crank but not start, or start only after several attempts. This is because the fuel pump isn't delivering enough fuel to the engine to ignite.
* Reduced fuel economy: A weak fuel pump struggles to provide the necessary fuel pressure, leading to less efficient combustion and reduced mileage.
* Whining noise from the fuel tank: You might hear a buzzing or whining sound coming from the area of the fuel tank, especially when the ignition is turned on (but the engine isn't running yet). This is the pump trying to work harder than it should. This noise is not always present, and sometimes a failing pump is silent.
* Loss of power: Similar to sputtering, but more pronounced. The van might struggle to climb hills or accelerate quickly.
* Check Engine Light (CEL): While not always indicative of a fuel pump specifically, the CEL can illuminate with diagnostic trouble codes (DTCs) related to fuel system issues, prompting a need for further investigation. A scan tool is needed to read the codes.
Important Note: Many of these symptoms can be caused by other problems, such as a clogged fuel filter, faulty fuel pressure regulator, or problems with the ignition system. A proper diagnosis requires a mechanic to check fuel pressure and potentially run diagnostic tests. Don't automatically assume it's the fuel pump without professional inspection.
