Help with fuel pressure, anyone? - Boost Forum

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Help with fuel pressure, anyone?
Friday, June 06, 2008 8:08 PM
Im going to be putting the accel afpr in tomorrow with my 310CC injectors and I got one question which might sound stupid. How do I make sure I dont put too much pressure into the injectors. I lost the manual for the AFPR and Im worried about tuning it.

For example, what would happen if I start my car and the pressure is set too high, could I break the injectors? What if its set too low? I have a wideband, so once its in Im going to adjust it using the gauge (get it right down to 14.7). But I want to know how to stay safe

Any pointers?




Re: Help with fuel pressure, anyone?
Saturday, June 07, 2008 6:17 AM
It will be ok whatever the pressure is at once you start the car... Since youll just be idling when you start the car and not at WOT lol its ok to be lean if thats what the pressure is set at.. Dont worry, just start the car and adjust your regulator from there.. Itll be safe.











~2014 New Z under the knife, same heart different body~
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Re: Help with fuel pressure, anyone?
Saturday, June 07, 2008 11:37 AM
hey sam, how is the s/c holding up ? (fine i bet).


FPR= i had tried the accell back in the day and wasnt impressed with it. it couldnt hold a steady pressure. that might have had to do with my stock fuel high mileage pump. same with a casper one.

i remember there was a place you could get them FPR'S for like 45$ shipped. i think that site is down and not sure how much the go for now a days.

stock fuel psi is 43psi at idle, pull the vaccumm tube off and it should jump up 10psi.

As far as too much fuel pressure. When i was testing my FMU i crimped my return line and seen the guage jump up to 100psi real quick and the car died.

Also i had a fuel guage(0-100 psi one from summit) tapped into my fuel rail. Just drill and tap it and you are set. Make sure you use some teflon paste (with teflon) on them threads and you will be fine.


good luck.




Re: Help with fuel pressure, anyone?
Saturday, June 07, 2008 2:08 PM
I wouldn't bother with the accel afpr. I had one and it wouldn't hold a steady (higher) pressure. It held less pressure than the stock fpr.



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