Noise, need help, please!

I need you help guys.

I have a noise on my car(20VT), i´m pretty sure it comes from the rear of the car.

It´s like a "knock" not very loud that you just hear starting from +-60kmh, that will increase a bit with speed.

The thing that is strange his it just makes the noise when you press the acclerator, if you take the foot from the accelerator it will stop!!!

Can you please help me guys?

Cheers.
Filipe

Fuel pump?

No, it´s not the fuel pump,but thanks.

No more ideas guys?

Just a thought - can you check the wheel bolts are tight?

+1 for checking wheel bolts, also wheel bearing or trailing arm itself.

Brake Bias Valve?
Or anti-rollbar bushes?

Seems to happen on acceleration, so when the front lifts up slightly and compressed rear!

What happens if you open boot and jump up and down on the back of the car (stationary of course) any noises?

Other than that, is it a rythmic knocking? Perhaps check exhaust rubbers, maybe exhaust is striking the body work, also check your top engine mount for movement, you may have too much engine movement, which adds some weight to the noise coming from the exhaust tapping the body work, that or you have a tax evading Brit' trying to get out of your boot

Sg