Thread: AFPR problem.

Since installing my NEW AFPR,i have had nothing but hassle with it,i have it fitted correctly according to what i have been told and seen people do it on sr20etc,but when adjusting the fuel pressure by the nuts on the AFPR,nothing happens at all,yet after a short journey,my fuel pressure gauge will read different pressures at different times,this has been as high as 6 bar and as low 3 bar,when it goes to 6 bar on it's own,there is no way i can set it to what i want,i was wanting to set at 4 bar to help my problem leaning out.When i take off the vac pipe for the AFPR,nothing changes at all,when driving,i might get a period where the engine runs good,then all of a very sudden severe fuel cut,2 or 3 times in a row.

I have had a used SARD AFPR fitted also to make sure the first AFPR i fitted was not faulty,the same thing happens,no control over fuel pressure whatsoever,no adjustment,nothing.

Help !

Will a NISMO AFPR work with it fitting straight to the fuel line,unlike the ones i have been using ?


Car is a p11 Gt.

Ummm... What is your new AFPR ?

A picture or diagram of how you have setup would help.

What fuel pump are you using?

What size/type fuel injectors are your using?



The NISMO one can bolt onto most fuel rails just a the stock one would.

Everything else is stock,pump,injectors etc,the AFPR at the moment is a automotive,it;s a middle brand,not the best,not the worst.

I get a picture up very soon.

Sound like you would be better off to find the root of your problem then adding more possible causes.

But with stock FPR,i had no drivabilty problems,just the dyno sheet showing the afr's to be in the high 16s across the midrange,so i brought a AFPR to hopefully bring the afr's near to spec and gain a little power to.

AUTOMOTIVE FPR 2013-08-08 19.08.16 | Flickr - Photo Sharing!

an AFPR is just going to make everything richer all over, so if its ONLY lean in the mid range but ok everywhere else its going to be counter productive..

you should get Nismotronic and actually tune it instead of tryin to bandaid it.

That's true,this is only temp fix etc,or so i hoped it was.I was wanting to make it richer to cool the engine down a bit to,the tuner said that they was a chance of major damage happening due to it running so hot.

what brand is that?
There is so much glare its hard to see anything but the gauge on it.

Are you using the afpr together with a stock FPR?

Agreed need better pics or a Diagram.