Aeromotive AFPR #13109 not working right?

[Suprapowaz!(2)]

A friend of mine lent me his Aeromotive AFPR #13109 cause his car will be down for a while. He had it installed for about two weeks on his car before he decided to pull the engine a do a different swap.

My fuel mods:

Walbro in tank 255lph pump.
Venom 550cc injectors (I bought these in 1996 from Python Injection, Inc. long before Ebay.com went public, so please spare me the Ebay junk comments. I had them flow tested at http://www.fuelinjection.com/ and they were good from the start.)
Aeromotive AFPR
J-tube bypassed
Stock fuel dampner still in place.
Lexus AFM
Garrett 60trim T4

The problem is I think the AFPR is on its way out. When I put it on (yesterday) and started the car I was curious to see what pressure he was running. Turned out to be 45psi. All adjustments were made with vacuum source disconnected. I then adjusted it as low as it could go by turning the adjustment screw counterclockwise all the way out. Fue pressure only dropped to 40psi. I drove the car around the neighborhood for a litte and saw the AFR's bouncing from 13.7-15.5's. Idle was around 17.0. At WOT 10psi of boost it would run 10.0's. I came back home and popped the hood to see that the AFPR went up to about 46psi. I made no changes to it.

Today I started the car, popped the hood, and saw that the fuel pressure went up to 50psi. I check the adjustment screw and it was still backed out all the way and still tight. I went to work and popped the hood and the pressure had went up to 60psi. Later left work and went to a friends shop to chat a bit, rechecked the fuel pressure and it's now sitting at 65psi.

Then all of a sudden my idle started to lope up and down erractically, and also notice the fuel pump whining and screaming as the idle would go down. When the idle would pick back up the fuel pump noises would go away. Fuel pressure would go to 60psi when the idle was down, and jump to 80psi when the idle would go up. Eventually it would settle back to 65psi when the erratic idle went away.

I'm thinking the high pressure is killing my fuel pump. Or maybe my fuel pump is just going out on it's own. But why all of a sudden after I install this AFPR is it doing this?

At this point I'm going to install the stock FPR back on and see if the erratic idle and fuel pump screams will go away. Again, my friend only used this AFPR for only two weeks before he pulled it. However is did sit in his garage for about 18months. Would that make an AFPR go bad? What are your thoughts?

BTW, this would be my friends third Aeromotive AFPR's. All different models, and they've all gone out on him. Well this last one went out on me. Has anybody else had problems with their Aeromotive AFPR's??? I think I'm gonna take it to http://www.fuelinjection.com/ to have them check to see if it's any good.


Here's a video. BTW, those are my injectors knocking like crazy after the AFPR install. They did not sound like this before. As mentioned earlier the adjustment screw is backed all the way out.

[video=youtube;n4QV8Gbs3vM]http://www.youtube.com/watch?v=n4QV8Gbs3vM[/video]


[video=youtube;urbK4x7_w4Y]http://www.youtube.com/watch?v=urbK4x7_w4Y&feature=youtu.be[/video]

 

[jonahs_supra]

are you sure its hooked up properly?

where is your vaccum/boost hose coming from?

 

[Suprapowaz!(2)]

Sorry, couldn't respond last night. My internet froze on me last night.

Yes. Line from the fuel rail where the stock FPR was to the side port of the AFPR. Line going from the bottom of the AFPR to the return line. Vacuum source from the stock location to the small nipple on the right side of the AFPR. Just like you have your hooked up except I used the left inlet side port instead of the right side like you did.

I'm going to go back to the stock FPR, and see if that clears up my fuel pump noise issues. I think this AFPR is killing my fuel pump.

 

[IndigoMKII]

Just being curious, have you tried taking the AFPR apart and make sure there's no trash in it? If it's jumping from 60-80 PSI I'd say there's a restriction inside the AFPR.

 

[Suprapowaz!(2)]

Being that it's not mine I don't want to take it apart. Maybe I can blow compressed air in it both way and see if something dislodges.

Videos will be uploaded in a couple of hours.

 

[jonahs_supra]

not trying to rain on your parade but i would be very scared of your fuel line rubbing on the hood
then you can be some graham crackers, marshmellows and chocolate

maybe you should try put the side fuel line on the other side like mine...i doubt itll make a difference...but its worth a shot
also my vaccum line is the factory boost sensor vaccum line

when i shut my car off now my fuel pump wines for about 2 seconds before shutting off completely
im thinking your vaccum line isnt cutting it for ya
try the boost sensor line and see what that gets ya

 

[jonahs_supra]

with fuel pressure at 65-70 psi and your idling at 15.2 afr which is what mines idles at with a happy vf signal
i would have to say the gauge is bad
try crimping the vaccum line off to see if fuel pressure raise and make sure its getting good vaccum...preferably using a vaccum gauge or vaccum/boost gauge

 

[Suprapowaz!(2)]

Yeah, I was going to use a zip tie to keep the line down but didn't want people to think it's ghetto. :icon_razz
I think I'm going to take your advice and use the vacuum source from the boost gauge port. When I disconnect the stock FPR vacuum source hose it doesn't hiss at all. I thought it would certainly hiss, and chance my idle. I'm now starting to believe that the fuel guage is not working right, and it's possible my fuel pump is on its way out. I think I'll order a new fuel gauge first. Then I'll go from there.

 

[jonahs_supra]

ahh i see what your problem is now
that vaccum line that your using is ran off the fuel pressure up vsv
when i installed my afpr i removed the vsv all together
switch to the vaccum line for boost sensor or remove vsv and use that line
that should/will take care of the problem
w/o vaccum it wont work right
try the above but im still thinking the gauge may be bad

 

[jonahs_supra]

also turning the adjustment screw out raises pressure
loosen nut and turn it back in

 

[Suprapowaz!(2)]

Hmm. Just looked at the online manual for the Aeromotive AFPR 13109 and it states turning the adjustment screw clockwise (in) will increase the fuel pressure. I'll change the vacuum source and see if that makes a difference. I'll also put an order in for a new fuel pressure gauge while I'm at it.

 

[jonahs_supra]

ok then im wrong lol
i havent adjusted mine for a while
let me know how using a different vaccum source works for ya

 

[Suprapowaz!(2)]

UPDATE: I took off the AFPR and put the stocker back on. Right off the bat my injectors quiet down. During cruising my AFR's only bounced from 14.8-15.1. I had no hesitation during mild acceleration. No fuel pump whine/struggle noises. All of my problems disappeared as soon as I took the Aeromotive unit off.

I didn't get a chance to get another fuel pressure gauge to verify if it was an old faulty gauge. My neighbor has one that I'd need a adapter fitting for it to work. Turns out I have that fitting, so I might borrow his, re-install the AFPR, and verify the pressure. That'll be later. I'll report the update at a later time.

 

[Suprapowaz!(2)]

Small update:

It turns out that I had the stock FPR VSV hooked up backwards. On top of that one of the VSV ports was blowing off under boost. I just figured that out too. So for that past year I didn't know that my VSV was unhooked. That explains when I went to the dragstrip my AFR's were in the high 12's to low 13's running 12psi of boost. I know, dangerous situation. This is what prompted me to install an upgraded AFPR. Enter the Aeromotive unit.


Since then I returned to my stock FPR. I cured my VSV blues, and connected it properly. I put a new vacuum line on the one side so now it stays connected under boost. I ran it WOT @ 12psi of boost and my AFR's was a rock solid 11.4. Turns out at this time I don't need an upgraded AFPR. Now I'm wondering how much boost can I turn it up to before it gets out of the magical 11.7-AFR range. I'm guessing another 3-5psi. That's to be determined later. Once I surpass the stock FPR I'll install an AFPR. Until then it's stock for now.

 

[Suprapowaz!(2)]

I ran it WOT @ 12psi of boost and my AFR's was a rock solid 11.4. Turns out at this time I don't need an upgraded AFPR. Now I'm wondering how much boost can I turn it up to before it gets out of the magical 11.7-AFR range. I'm guessing another 3-5psi.

Uhh, it was more like 2psi more boost and it put me at 12.4's AFR. That didn't take long to over shoot the stock FPR. And yes bitches, I am replying to myself!

 

[jonahs_supra]

uhh, it was more like 2psi more boost and it put me at 12.4's afr. That didn't take long to over shoot the stock fpr. And yes bitches, i am replying to myself!

winning

 

[Suprapowaz!(2)]

Update on the Aeromotive unit. I spoke to a tech at Aeromotive about the faulty AFPR. He said although it's extremely rare he has heard of this issue of the fuel pressure continues to rise with no adjusting it down. He asked me to send it in so he can take a look at it and adjust anything that might be about of whack. Hopefully that'll cure the problems. I'll let you guys know how it goes.

 

[Suprapowaz!(2)]

Uhh, it was more like 2psi more boost and it put me at 12.4's AFR. That didn't take long to over shoot the stock FPR. And yes bitches, I am replying to myself!

Found out that the vacuum line still blew off the stock FPR port under boost. I finally got it to stay on and it's running 11.8 AFR at 15psi. I'm going to slowly turn it up and see how far I can go with the stock FPR while still staying the in the high 11's AFR range. I think I'm going to be hitting fuel cut first before I push into the 12 AFR range. I know this because I already hit fuel cut by accident somewhere north of 18psi and AFR's were still in the 11's. At least I think. I'll double check and give results.

 

[Suprapowaz!(2)]

I hit fuel cut at 17psi and was running 10.8 AFR's. That's weird. I backed it down to 16psi and was hitting 10.9AFR with no fuel cut. I don't know why I was running 11.8's the other day at 15psi, and now richer with one more psi of boost. Either way, they car feels good, stock fpr is doing good. My limitation is now fuel cut. I think it's time for my to try to run speed density.

BTW, I found out what the problem was with the Aeromotive AFPR. My friend had it sitting in his engine bay just dangling, with no hood on, in the middle of the country. Mud daubers got a hold of it and made a nest in the return line. I was about to send it off to Aeromotive, and I started taking the fitting off of it so they wouldn't accidently misplaced them. I looked at the return line and thought to blow compressed air into it. Out flew a bunch of crap. That return line was completely clogged.

 

[IndigoMKII]

Told you about the restriction.. Glad you figured it out.