there is alot of speculation about using a pulsation dampener or not using one.

many people get rid of it when it leaks or even before it leaks, not thinking twice of the possible risk of pulse waves in the fuel causing damage to the fuel injectors.

is this hoax or is there evidence behind this IN STREET APPLICATION.


most good fuel pressure regulators have a built in fuel pulsation dampener. aeromotive 1-1 as an example. this fpr sits after the fuel rail on the fuel return and dampens the fuel accordingly protecting the injectors from harsh waves.


now every one i talk to and know they dont run a pulsation dampener, but the tuners i talk to say that they are a critical part of the fuel system and one must not go with out a pd.


i would like to see a pole of who uses one (including fuel pressure regulator with PD built in) and who doesnt use one. including what size injectors you are using and what hp range as well as boost.

 

mine is built in to my fpr, but i did not plan to purchase my fpr with one. it just decided to. all my friends have had theirs ditched and they run perfectly.

aeromotive fpr
550cc primary
1600 seccondary
stock rails, an fittings and ss covered rubber line.

 

never used one and never had a prob jessica! lol
lee runs 9's on a hurt motor and doesnt use one! lol

 

My new setup, 720/1680 injectors, has one built into the Aeromotive 1:1. The old setup (550/720) went for about a year without a PD with no damage though.

 

That is simply not true. Here's what my toyota fuel injection manual has to say about the PD:



Besides canceling out some noise as the fuel injectors operate, the PD is there to reduce variation in fuel delivery. On a practical level (not concerned about emissions etc), it's not that important for an n/a engine because the likelihood of detonation or lean mixtures is slim. On a turbo car it may matter more for the safety of the engine, but it still depends on many factors.

 

I don't use one one my n/a, haven't had a problem. However, I'd invest in a new one if I were building a turbo car. The "The amount of injected fuel will be more or less than the desired amount" line scares me.

 

https://www.rx7club.com/forum/showthread.php?t=395021

 

i was wondering ussing the stock fuel setup, and ussing the banjo bolt and a FPR inline would this work, if the fpr has a PD built in then it shoudl be good right. hooking up the fpr right after the filter and still run the stock fuel setup, also making sure the FPR is just there as a PD and not bleeding excess fuel away, any ideas?

 

the FPR should be last. Do not put it after the fuel filter.

 

oh ok, but the PD comes first in the stock setup, so wouldnt you want it coming first also?

 

the location of the PD is nowhere near as important as the location of the FPR.

 

okay i meant to say leave the stock FPR in the setup, remove the PD and replace it with a banjo bolt, and run a aftermarket FPR that is only being used as a PD not as a FPR, and run that inline before the promary fuel rail

 

That'd be a waste of an aftermarket FPR. There's nothing to lose by having the built-in PD located after the rails with the FPR. It will still dampen pressure waves and do its job.

 

using a pulsation damener vs not


Sounds interesting but is she high maintenance?

 

sorry my spell check doesnt work in the title bar.. sorry i left out the P
thanks aaron. i tried doing a search but way to much junk popped up.
i was told that a FPR that has a pd installed simply just absorbs the fluctuations in the fuel rails. i could be wrong but being that this is true, having it after the fuel rails would be almost the same as having it before.

im not sure though. but think, if its just basically moving with the pulses and absorbing them like a shock absorber then anywhere in the fuel system near the injectors would be ideal.

 

I bought a brand new one when I rebuilt the fuel system in my car. I don't like the design of the thing, but I feel pretty safe that it isn't going to leak anytime soon though. The old one I took off was scary looking.

 

Had one on my first FC, it was an engine fire waiting to happen. Before I removed it it could fill a shot glass after idling a few minutes. Replaced it w/ a banjo bolt, never had any problems.

I launched a preimptive strike on the PD in my current FC, replaced it w/ emissions removal. Been running the stock injectors and 9-10 psi like that for 3 years w/o issue.

 

yeah i know it would be a waste, but i got a aeromotive FPR just laying around,i was just planning on running a banjo bolt and the FPR right after the fuel filter, and all id be ussing the aeromotive FPR for is for a PD not as a fuel pressure regulator, as in it would be allowing the same pressure in and out of it...sound like a waste of time?

 

Yes. Do it right the first time.

 

When i removed mine, it appeared to be in perfect working order.

I deleted it for peace of mind. The last thing i'd like to do is lose my car to an engine fire.

And if you own a wideband to TELL you your air/fuel ratio, the tiny change that MIGHT occur from deleting it in your fuel delivery will be apparent and you can adjust your system accordingly if you need to.

 

From a dampening perspective yes it might work the same, but you are still placing it before the injectors (which are constantly opening and closing). But the whole purpose of a fuel pressure regulator is to meter the amount of fuel returning to the tank so that fuel injection pressure is the same relative to manifold pressure.



If you put the FPR before the fuel rails... I don't even know how that would work. You would have a huge pressure drop I guess. You would be hooking the fuel rails to the return line from the FPR. I'm not even sure if the car would run.

 

Same deal with my FC, and I did the same... so +1