Unusually noisy pump?

[JH32]

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?

[Guest KILLER-T]

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?

[Pva_Glue]

is it possible it's 4WD pump.... my car makes that ZZZZZZZZZZzzzzzzzzzzzzzzzzz noise when I start her up.

cheers

Joe

[GTS-t VSPEC]

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:

[Pva_Glue]

these new pumps, do they do anything to fuel economy? increase or decrease?

cheers

joe

[GTS-t VSPEC]

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:

[JH32]

phew!

thats kool then that it happens to others hehehehe

it was pretty hot yesterday/today, i'll give it that!!

[optical]

yeh mine was a tad noisy on startup today, it buzzed for a few secs then went quiet then again yadda yadda. then she was all good later on.

heating of fuel in tank would be problemo id say

[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:

[Guest KILLER-T]

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

[GTS-t VSPEC]

KillerT,

In my last post I was actually answering GT25-S13's question. I had already answered JiMiH's.

See'ya:burnout:

[Guest KILLER-T]

Ok