fuel pump prime when acceleration??

[silver gts-t]

today in this 40+ degree day, i was parking my car and noticed as soon as i touched the accelerator pedal i could hear a noise, what sounded like my fuel pump, and it would stop if i let of the pedal.

never noticed the noise before.

any ideas????

[3R1K]

It happened to my car since I fit in my fuel pump (aftermarket) so I thought it's a normal noise?

[silver gts-t]

ive never noticed the noise except for when having reds on and starting the car,

but not everytime i touch the accelerator

[3R1K]

Mmmmm weird, should I check it then? I'm using nismo fuel pump.

What's yours?

[silver gts-t]

walbro

[silver gts-t]

ohh and allso could notice the strong smell of petrol

havnt checked in the boot yet

[adznight]

It's standard, they only pump a small amount of fuel at idle then when you put the foot down they pump at full pressure. This I assume is to prevent excess fuel being pumped up the lines then having to flow back to the tank via the overflow (or what ever it's called).

I noticed it with my Bosche 975 and pulled back into the workshop and asked. I also smell fuel sometimes when starting the car and have worries a little too. Might be a breather?

[silver gts-t]

u sure? never heard it before

[adznight]

Yes 100%, I'm sure someone can confim.

[silver gts-t]

i hope so coz i dont trust you

joke lol

[adznight]

Yeah yeah....

[silver gts-t]

im gonna go down on my break and give her a whirl see what she does

[silver gts-t]

seems fine now???

i dunno

[BHDave]

Mine does exactly the same thing, it's just more audible on hot days for some reason, Walbro as well

It's just the fuel pump speed control. The speed drops at idle as the power feed to the pump gets dumped through the big resistor near the ps reservoir when ever your foot isn't on the throttle and the car isn't moving

[silver gts-t]

no worries

thanks guys