fuel pressure problem
Turbo Mini Forums

I have a brand new fuel pressure reg fitted, but when the pump is on the fuel return pipe pulses quite bad, the fuel pressure gauge flickers up and down with it too, pretty sure there is no kinks or bends in the pipes? Also when I came to run the car it would run for a few seconds (<5secs) then cut out is, is my reg. Knackered? Any ideas?

Edited by bennyy on 15th Feb, 2012.

Audi s4 b5 - 470bhp & 486ft lbs

On 30th Apr, 2012 Brett said:
yeah stick the bit in and give it a wobble

If you take the reg out of the equation does the pump run constant?

If not then it could be your pump.

If something is worth doing, it's worth doing half of.

That's something to try, it sounds ok, I shall put the gauge into the fuel in pipe before the reg see what the gauge says.

Edited by bennyy on 15th Feb, 2012.

Audi s4 b5 - 470bhp & 486ft lbs

On 30th Apr, 2012 Brett said:
yeah stick the bit in and give it a wobble

What regulator is it...and have you plumbed it correctly ?

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

the right one and yes.

What does the pump sound like ? And just exactly how much is the fuel pressure changing by ?

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

The pump sounds ok, just a constant buzz, then after a couple of seconds you start to hear it pulsing at the reg, and it from memory if flicks 2-3psi.

Audi s4 b5 - 470bhp & 486ft lbs

On 30th Apr, 2012 Brett said:
yeah stick the bit in and give it a wobble

try winding it up to about 10psi, you should hear the pitch of the fuel pump change, if it stops the pulsing wind it down untill it starts again
what size fuel lines does it have?
could be as the pressure reg purges of the excess fuel the pressure drops too fast and it stops purging then starts/stops over and over
as i said earlyer at yours mine did this the other day after you came round mine tuned out to be an air lock of some sort

Yes i moved to the darkside

Instagram @jdm_brett

Make sure the return isnt blocked/restricted.

To double check, pull the return pipe off the reg and put somthing underneath to catch the fuel and try .

Thanks lads, I will check all these while the block is away.

Thanks again.

Audi s4 b5 - 470bhp & 486ft lbs

On 30th Apr, 2012 Brett said:
yeah stick the bit in and give it a wobble