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Aeromotive AFPR problems

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turboglenn

15+ Year Contributor
6,375
111
Nov 5, 2007
RIpley, West_Virginia
Well, i searched because i saw a thread about this when i joined but didn't find an answer in my search results.

I got an AFPR (aeromotive) from import evolution a few months back. When i first installed it i could not get the pressure to stay the same. I would set it to 43, it would fall to 35 after a drive. I readjust it to 43, the next time i pop the hood it's at 50psi. I eventually left it alone thinking that the springs and such just needed to seat in and it would steady out.

Well, lately I've been having major issues with my tune being inconsistent. It's most noticeable at idle where the small change in pressure will take me from 13:1 AFR to 18:1 when the AFPR goes kookoo. Then some times it's back to 11 &12:1 at idle. It's also noticeable when watching the closed loop correction as well, but it's minimal at WOT because of the large pulse widths and running real rich to start with.

MY QUESTION: Is there a fix for this or should i call IE and hope they still honor a warranty or something on it? I hope there's a fix, because i hate having to ask a vendor to take something back after so long, plus i know i hate the waiting on a new part, shipping one out etc.... petty reasons really.
 
Well. Import Evolution is already giving me the run around on how there's no way it could be the AFPR and how it has to be something else in my setup. I assured him that i've checked voltage, rewired the pump, no kinks in the line etc etc etc,, and he still kept going back to something i've already told him i've elimitaed as the cause. I explained it had been doing it since day one and that it wasn't normal. And all i wanted him to do was honor the warranty, then i get told "theres no electronics in a fuel pressure regulator" DUhhh.. Did i come off as mentally challenged when speaking or are you playing me for stupid?

Again around in circles we went untill my pitbull bit my pinscer and i had a dogfight on my hands and had to get off the phone.

I explained to him that all lines are kink free, the pump is good, new fuel filter bla bla bla and that i was sure it was teh AFPR and all i wanted to hear was " if you can't get it right we'll take care of it" not all this about i'm doing something wrong, my car is at fault, my grandma can't tune..all irrelevant IMO but certainly NOT CUSTOMER SERVICE!!!!


So far i'm anything but pleased with IE at this point. So i'm tearing the whole thing apart tonight, inspecting it and testing it some more (per his request) and i'm sure tomorrow will be the same thing. If i get the same run around again after that you can rest assured that the replacement i order WON'T come from them!!!!
 
I had the same problem on mine in the begining... But mine took care of itself in an hour or so of adjusting and driving it... It kinda fixed itself. Now my problem is that my fuel pressure goes up and down with my turn signal...WTFROFL
 
Took it apart, celaned and inspected it today, everything was fine. I'm giving it a few more days, then i'm changint to one of my customers aeromotive units and we'll see what happens. If this thigns still acts up and another aeromotive fixes it and THEN I want to see how he handles it, if i still get a run around they'll never see another dollar out of my pocket. Then i'll have to call aeromitve and explain the situation in hopes that they'll swap out the unit.
 
Do you have the short square one or the tall one. I know not to descriptive. The reason I ask cause just last night my 90 AN elbow fitting cracked on me lastnight, this was with the short square AFPR. I have the tall one on my son's car, so I put that one on till I get the replacement elbow.

Well the point I'm getting at is that the tall one holds a better idle for me, the short one I've geen pulling my hair out trying to get it to idle. The problem I have been having is stalling when dropping the throttle from 1500rpm and higher. I have to engine break to less then 1200rpm for it not to stall. That went away with the taller AFPR.

They both held pressure setting. No fluctuating.
Not sure if that helps you.
 
Well it's still acting up, i'm not sure if it's "tall or short" it's the one that Import Evolution sells in their "2g kit". Per his instructions, i took it apart, re-assembled it and have set it 3 times already and once agian, last night i set it to 43 w/o vacume, and today it reads 38 w/o vacum..that's 5 psi.. now i wouldn't care if it would just stay where it's at, but by tonight i'm sure it will be back up to 43 effecting my tune once again. I remapped the car for 38 psi today so we'll see what happens. Tomorrow i'll most likely put the one from my customer's car on and see what happens
 
Are you using the glycerin filled gauge or just reguler guage. I found the glycerin to fluctuate wuth heat.
I set the pressure by starting the car with hood up. As soon as thermostat opens or 190degees water temp is acheived I set pressure. Once a month I check it this way.
 
Yea, it's the liquid filled guage. I've tried adjusting it hot, cold, sideways and every other way. i'm conviced this AFPR is junk. After taking it apart and inspecting it, i found nothing visibly wrong, but now it's even worse at it's fluctuations. I'm baffled by this one. up down up down..tonight it was back at only 33p si with no vacum, then when i got home from that drive and the car was good and heated up it was at 40 with no vacum..Keep in mind i set it at 43.5 (or as close as you can get anyway) and it's drifting this far off, this is bugging the shit out of me and I got so frustrated i'm hesitant to call back because of my blood pressure if i get worked up again by being ran around like i'm an idiot by this guy. Nnothing get's me heated faster than talking to me like im dumb, esppecially about mechanical things....A 152 i.q. and damn near 20 years of wrenching experience says otherwise.

I will give one last call to him trying to straighten it out like a civilized human being, i hope that he takes me serious this time!
 
I have the exact same scenario or close to. Import evolution aeromotive fpr; varing pressure levels. I have the supra pump rewired with an autometer electric fuel psi gauge, sensor is remote mounted with afpr. starts up at 43psi after long drives it may settle to 37psi. doesn't decrease properly with vacuum but responds linear with boost. WTF mate this is the one dilemma of my setup that I haven't been able to fix yet, I'm wondering if its bad gauge(although I verified it with a manual one), check my voltage, perfect, check the fpr no leaks, no kinks in lines, ect.:confused:
 
Was this ever resolved?

I just installed my IE AFPR kit. Fuel pressure gauge "shakes" from like 41-43psi with the vacuum line off [YES I know different problem]. If it's under 30psi its rock solid, above 55psi its solid [steady] but from 40-52 psi it jumps around slightly, any ideas?

Also, I have NOT checked if the base FP changes...I'll check on that in a couple of days and keep you updated! :dsm:
 
Did anyone in this thread rewire their fuel pump to make sure that the fuel pump was getting constant voltage not hindered by the rest of the car's electronic needs? I mean that'll cause all sorts of fluctuations due to the fuel pump working harder or not as hard based on the voltage input.

Make sure you do this first and THEN see if it's the FPR.
 
Did anyone in this thread rewire their fuel pump to make sure that the fuel pump was getting constant voltage not hindered by the rest of the car's electronic needs? I mean that'll cause all sorts of fluctuations due to the fuel pump working harder or not as hard based on the voltage input.

Make sure you do this first and THEN see if it's the FPR.

Do you have to wait to do the rewire mod when your installing the AFPR? I have the rewire kit but have not installed it since I still don't have an AFPR. Should I wait and do them at the same time or is it okay to do the rewire before I have the AFPR?
 
Do you have to wait to do the rewire mod when your installing the AFPR? I have the rewire kit but have not installed it since I still don't have an AFPR. Should I wait and do them at the same time or is it okay to do the rewire before I have the AFPR?

No I don't think you need to wait, mine is doing good without the rewire beside being a little jumpy [with the vacuum hose on it doesn't fluctuate]. Are you part of LADSM? I think I might go to the meet tonight. LMK if you need a hand with the AFPR.
 
Glenn, does your vacuum remain steady at idle? What is the value? Maybe a vacuum leak causing fluctuations in turn affecting the AFPR.
 
Ideally you'd want to do things in THIS ORDER:

1. Fuel pressure gauge in the car (under the hood if possible but since these come with AFPR's it'd be overkill for the most part) and see what you are working with under all conditions.
2. Rewire the fuel pump and see where this gets you on the fuel pressure gauge.
3. Install the AFPR and see what this gets on the fuel pressure gauge.

That lets you modify and see what you've got to work with and find new and old normals as well as sort out an problems that come up.

In your case though, I'd just rewire it and go from there. :thumb:
 
DO you mean write a review using a fake name for the shop? Or are you saying take the name out of this post and make a review about how they treated me and actually mention who they are in the review? I'd be glad to write anything about this, I was all for supporting their shop being that they area semi-local, but now after being treated like a 15 year old idiot ricer kid just so they could try and make me feel like something was my error and never a defective part, i have no problem paying extra shipping to get something just as fast from further away.
 
"Don't post complaints or reviews about vendors in the forums. You are encouraged to post your vendor reviews at Vendors-Reviewed.com."

I do feel the pain, and have had similar experiences in the past with vendors, but let's keep it parts on here.

DO post that on VR. It has become a valuable resource over the years.
 
Your fuel pressure should be set at 43.5 with vacuum lines off. With it on, it will drop to about ~35. (~-18mmHg is about equivalent to 9psi. 43.5 - 9 is 34.5). You might also read a bit lower than that if you have a liquid filled gauge in a hot engine bay due to the effects of thermal expansion and increased pressure in the gauge face. I have found it can change up to 4 or 5 psi but have no effect on my tune.

Set it when cold and leave it. It's only a problem when it becomes way off.
 
I have the exact problem with same AFPR and same vendor.
I did put a bit of grease on the adjust bolt and it has no leaks there.

It seems that when the engine bay is hot, the gauge reads about 5psi less.
I do have a Marshall liquid filled gauge.

Is the gauge the problem or the fpr?
Maybe the fpr spring does change it's properties when hot?

I also have problems dialing my new 750cc FIC injectors. I had to set them at 705cc to have correct AF ratios.

How did it end Turboglenn?
 
Get rid of the liquid filled gauge and put a regular one in. If you look at Aeromotives site they tell you NOT to use the liquid filled gauges. They are too inconsistent.
 
Yep, I just got en email from aeromotive telling me the same. Or to drain the liquid and keep using the gauge.

Thanks hhuricane.
 
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