Question for those w/the AEM AFPR

[MADMarc]

I have had mine in the car for a bit now but it bleeds off pressure fairly quickly when the car is turned off. Before, with the stock afpr, I never had issues firing the car up and it always held pressure in the lines. Now that I have the AEM regulator I can give it some time and almost all of the pressure bleeds off. It doesn't leak fuel nor does it cause any problems except for when I fire up the car. When I do a cold start it takes a second or so longer to get fuel in the line and then when it starts it isn't immediate like it used to be, rather it acts like I'm starting a carbureted motor.

No REAL problems, just want to check if this is an issue I need to take care of or not.

[mb3000]

This is a symptom of the majority of AFPR's on the market. You should be fine.

[apickle]

Mine has done this since I installed the afpr as well.

[Chris@Rvengeperformance]

mine did this after being installed for 6 months or so. I think the orifice seat wears. pretty shitty if you ask me.

[MADMarc]

Thanks for the input :) So I'd probably have the same problem whether it was an aeromotive reg, aem reg, etc?

[UTRacerX9]

Thanks for the input :) So I'd probably have the same problem whether it was an aeromotive reg, aem reg, etc?

Yes. My aero does the same thing, and so does the one on my friends 300ZX TT.

[Toni]

It can be a very big problem. Especially if you are on the edge of fuel flow as it is requiring it to seal properly to maintain pressure. If something has changed, ie you notice it getting worse. I would take it apart and check for wear.

(Scroll to end)
http://www.3sgto.org/f2/huge-afr-difference-between-banks-after-5600rpm-what-gives-5282.html

[Chris@Rvengeperformance]

does anyone have a solution to this? There has to be an aftermarket FPR that behaves correctly.

[UTRacerX9]

Mine is just fine when driving/boosting, as is the one in my friends car (the 300ZX.) My fuel pressures stay rock solid. Mine has released pressure since day 1, and since I've always heard of other types (AEM, Jet) doing the same thing, I figured it was normal. Frankly, I kind of LIKE that it drops pressure, because sometimes I don't drive the car for months at a time, and when I'm cranking it, I like that the engine gets a bit more lubricated before she actually fires up.

[MADMarc]

Iiiiinteresting. I wonder why they do this though...like, is there any functional purpose to it or is it just how it happens to work? Crazy to read about that orifice causing you all of the problems, toni. Did you notice any damage to it when taking it apart?

[Rom3BreaK]

Just checking in, my AEM AFPR loses pressure quickly after shut off as described. I've noticed it drops pressure after shutoff a bit faster now as compared with when it was brand new less than 6 months ago.

[Chris@Rvengeperformance]

I hate it. When I had the stock fpr my car would start on the first crank/rotation of the engine. Now it usually at least 3 cranks and sometimes like 6-8.

[mb3000]

I love it. Makes messing with the fuel lines easier. :lol:

[MADMarc]

I love it. Makes messing with the fuel lines easier. :lol:

lol that is the ONLY perk I've found so far :P

[Toni]

Iiiiinteresting. I wonder why they do this though...like, is there any functional purpose to it or is it just how it happens to work? Crazy to read about that orifice causing you all of the problems, toni. Did you notice any damage to it when taking it apart?

Check the end of the thread...there was a worn part. No damage to the car because I monitor/log all the time.


Just checking in, my AEM AFPR loses pressure quickly after shut off as described. I've noticed it drops pressure after shutoff a bit faster now as compared with when it was brand new less than 6 months ago.

I would take it apart and inspect the orifice ball seat. Chances are if it has gotten worse you have wear or leak somewhere else in the system.

[sublime_whatigo]

I had 2 identical new aem fpr's for a while. 1 would hold pressure for weeks, the other loses pressure the very second the key is turned off. Still using the one that loses pressure with no issues.