Why does the fuel pump beep?
If the fuel pump is blocked by engine gunk, dirt, impurities in the gasoline or anything else, it will respond with a whine or some other very noticeable noise. Debris in the fuel tank can be sucked into the pump most easily when the tank is low. This debris gets caught in the pump and reduces the pressure.
Where does the noise come from when the fuel pump is running?
The sound was coming from the area of the fuel tank so I assumed it was the fuel pump running. BTW, during the purging process, the “noise” we hear is from a vacuum pump frequently resides next to (some models within) the EVAP canister and often right above the rear axle next to the gas tank. ?
What happens when you turn off the fuel pump?
When you turn the ignition ON (even without starting the engine) that activates the fuel pump and also pressurized the tank; therefore, the purging process stops (to allow the gas tank to be pressurized – only a few psi of pressure) and “the sound went away”.
Where is the fuel pump on a Toyota?
It sounds like a small electric pump (sort of a whirring noise) near the left rear tire. Thanks to all for the info. 1st time I’ve ever heard that, and was sure it was the fuel pump, as it was, as said, right near the drivers side rear wheel well.
Can a fuel pump run when the engine is off?
So this is normal for the fuel pump (or what sounds like the fuel pump) to run with the vehicle turned off after being driven 4 or 5 hours ago? It must have been running for about 10 minutes, when I put the key in the ignition and turned it to on without starting the engine and the sound went away.
The sound was coming from the area of the fuel tank so I assumed it was the fuel pump running. BTW, during the purging process, the “noise” we hear is from a vacuum pump frequently resides next to (some models within) the EVAP canister and often right above the rear axle next to the gas tank. ?
Why does the ground go away after replacing the relay?
It could be that replacing the relay which caused the problem to go away was conincidental. The trigger for the relay is grounded through the ECM. The ground is provided electronically for a few seconds when the key is turned on and is maintained after that due to a pulse from the ignition module. It could be due to an erratic fault in the ECM.
It sounds like a small electric pump (sort of a whirring noise) near the left rear tire. Thanks to all for the info. 1st time I’ve ever heard that, and was sure it was the fuel pump, as it was, as said, right near the drivers side rear wheel well.