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Unusually noisy pump?

JH32

By JH32,
in Forced Induction Performance

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JH32 Grand Master

JH32

Posted
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Today when it was stinking hot (38deg), my fuel pump was very loud! It was making a high pitched "zzzzzzzzzz" noise :confused:

It's a Bosch Motorsports one, a 910.

Has anyone else experienced this?

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Guest KILLER-T

Guest KILLER-T

Posted
Posted

Yes i have a bosch pump and that was the first thing i noticed when it got hot the pump got louder. It must have something to do with the fuel heating up and creating more pressure in the tank but i could be wrong?

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GTS-t VSPEC Grand Master

GTS-t VSPEC

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Hi Guys,

I think all aftermarket pumps tend to be noisier on startup, when they try and build up the pressure, that's why you need to turn the power on for about 2-3sec before you try and start the engine.

I think the heat can cause pumps to cavitate alot more, form air pockets while pumping, which may be causing the pumps to make more noise. That is why alot of people will use swirl pots (surge tanks) whe they get a larger fuel pump, to prevent the air pockets getting to the fuel rail.

This is my 2c, not sure if everything is 100% right, but I'm sure someone will correct me if I'm not.

See'ya:burnout:

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GTS-t VSPEC Grand Master

GTS-t VSPEC

Posted
Posted

Pva_glue,

They shouldn't affect fuel economy as such, but in general if you need a bigger pump you have bigger injectors to feed more power, so you'll end up using more fuel in direct relation to the power output.

The bigger pumps simply allow for more flow, but if the flow is unused then it will simply return back to the fuel tank. With a bigger pump it's also worth getting a rising rate fuel pressure gauge, so that you can ensure that the pressure being delivered to the fuel rail is constant, because the bigger pumps are more likely to surge.

See'ya

:burnout:

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Guest KILLER-T

Guest KILLER-T

Posted
Posted
Originally posted by GTS-t VSPEC

The buzzing of the fuel pump at startup is it priming itself, you shouldn't try to turn over the car at this stage, wait the 3 seconds until it stops and then start the engine.

See'ya:burnout:

I think what JiMiH is talking about is the buzzing noise that a bosch pump makes while the car is running on a hot day

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