Well, I have a bunch of injector pod assemblies and wasn't sure what to do with them.

I am in the process of making all of the regulator covers adjustable. They more than likely will not be like CFM-Tech's or Xtreme-Fi's setups. They will be fully adjustable, but the fuel meter cover will need to be removed in order to adjust.

The reason why I am doing it this way is very simple... Fact, not one of the adjustable regulator covers is easily adjustable on the vehicle while it's running. In fact, it's virtually impossible. Some pickup trucks are easier to adjust than most 305-350 TBI cars. An average person just can't get their fingers in that small of a space to move a screw or to get an allen wrench in there.

Trust me on this, lol. I have spent the past 4 weeks embarking on finding the right spring that yields certain psi readings. Read the post that 89IROCZ28 started https://www.thirdgen.org/forums/tbi/...-pressure.html Since doing all of this I have tried 6 aftermarket/custom adjustable fuel pressure regultors. I have spent about $400 on the adjustable covers alone to find one that works......

Let's be honest here. Once your air cleaner assembly is off it takes all of 30 seconds to remove the fuel meter cover. It's only 8 screws. I have done it numerous times the past 4 weeks. So, if you want to adj your psi it takes about 5 minutes from start to finish. I have done it. I have timed it. IT'S EASY.

So, in a nutshell, I am going to continue to fabricate and modify the stock regulators to be adjustable and then place what I feel to be the best spring in each unit. I have about 16 different springs that I have tested.

If you are interested let me know. I can make almost any kind of combination imaginable. I can sell the whole injector pod assembly together with new diaphragm, new spring and adj fpr or I can sell the cover by itself, etc. As you see by the thread from 89irocz28 i have a bunch of springs that yield a wide range of psi. I will include multiple gaskets with the kit so you don't have to worry about buying a high dollar kit just to get one or two gaskets that you need. Each one has been cleaned and will be powder coated in a flat black with a mild texture.

Let me know who is interested and I will see what i can do for you.

Please email me at tbiparts@mchsi.com and I will give you more detailed info.

If any of you have successfully used an aftermarket adj reg that "allows" you to adjust while car is running please let me know. I have spoke with over 30 people on here via email and pm and not one had much success.

 

Any thoughts?

 

I have one to adjust with a imbus key, its a modified stock one.

The imbus key needet to be cut shorter to access the AFPR screw, a mirror and a light are a must.

Connecting the gauge to the inline adapter, taking the aircleaner off, unpluging the rear vacuum lines and setting the FP takes 5min (15min the first time).

If you figure out a VAFPR that fits at stock location, easy to adjust like the one I have and is precise like the aftermarked ones Id be interested.

 

The few that I have made and tested so far are easily adjustable, but only when removed from the injector pod. I honestly don't think there will ever be an easily adjustable one that can be adjusted while on the vehicle. WIth the way our injector pods are designed the fuel inlet and outlet ports will always get in the way as well as the map sensor vacuum port. Another one of GM's misfortunes. Holley has done an excellent job with their TBI setup. You can buy the adjustable fuel meter cover for the Holley units for about $90 and they adjust from the top and not the bottom like our GM units.

 

This is how the imbus key looks like that allows me to adjust the AFPR easy with a mirror and a light in less then 5min.

Im sincerely interested if you can come up with a precise VAFPR that goes in the stock location.

 

Are you looking for one that can be adjusted while on the vehicle?

 

Are you looking for one that can be adjusted while on the vehicle?

 

Yes that would be nice.

 

I am trying to work on that, but my main focus is converting the stock regulators to be adjustable by removing the fuel meter cover assembly and then adjusting the psi externally via a socket head screw or something similar.

I have a ton of ideas to make the unit easily adjustable, but it is going to take major modification and a machine shop, lol.

 

Because of the easy functionality of the one I have by using proper tools, that is simply a modified stock one (it also looks like you have the exact same AFPR on one pic of your previous post), I would rather incourage you towards investing your energy in building or transforming a FPR that does not exist like a precise VAFPR that fits in the stock location.

 

Here's one of the ones that i have tested. One of the best overall setups that I have seen and installed on my TBI, but who the hell can adjust it? LOL

 

The other problem with this setup is you can't take the fuel meter cover off without removing the entire injector pod due to the red cap. Only way to get around that is to make the whole larger in the injector pod itself
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For some reason i can't edit my previous statement. I meant "hole" and not "whole". sorry...

 

The setup I have can be adjusted while the unit is on the engine. It required trimming an allen wrench down to fit and I wouldn't attempt it with the engine running b/c of the tight clearances. I also modified the regulator housing (cup) to install it 180* around in order to see the tab as a reference while adjusting it.

I wish I pictures of it, but the car is stored away for the winter.
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dctrumpet - I wondered how the AFPR w/ the red **** was installed/removed. That must be a real pain, especially after paying what they ask for it.

 

Not easily adjusted and NOT easily removed. In fact, I can't adjust it while it's running. Honestly, I have tried a ton of times and just can't adjust it. It absolutely CAN'T be turned.

I actually had to take a 1/4" off the length of the screw so it would not hit the top of the map sensor vacuum port.

There is not one that can be easily adjusted while on the car and while running.

 

Check out the attached .pdf file. It's what I based my modification on. The difference being is mine uses a knurled socket head cap screw that drops below the regulator housing similar to the concept of the 'red ****' version.

My intention was to adjust it by hand. But, as you discovered w/ the 'red ****', that's literally impossible. There's not enough room to get your fingers on it, let alone exert enough force to turn it in order to compress the spring. Had I kept the capscrew shorter or used a screw like the one in the attached file, I believe it would be even easier to get an allen wrench on it in order to adjust it. Might still need to modify the allen wrench, but it would provide more room to get the wrench on it.

Another idea would be to use a standard hex head screw that extended below the regulator housing, but remained above the fuel fittings, that you could put a small wrench on to adjust it. I think it would be easier than trying to hit a hex shaped hole that can't been seen w/ an allen wrench.

 

Here some pics of one of the AFPR that will allow it easely, also it is not really necessary to have the engine running to set FP.

Note that if the adjusting screw was a little shorter I could do it with the vaacum line in place.

 

Good pics. That's basically how mine is set up.

I don't know why I was thinking the fuel fittings were lower. I must have been thinking of the vacuum port.

 

@thomas and 89irocz28: so the ones you have are not vacuum-referenced right? are these the xtremeFI afprs?

dctrumpet, what would be the difference with these units compared to yours?
btw, i dont remember seeing any injector pod vafprs yet..

 

What about connecting a "snake" 90 degree elbow to move access to the adjustment bolt to be right between two fuel I/O??

//RF

 

Be sure to use some blue locktite (removable type) on the screws. Same with the three that hold the pod to the body. They make a mess of things if they come loose.

RBob.

 

I am in the process of designing something that is easily adjustable while installed on the vehicle. You're right the car doesn't need to be running, but that is beside the point, lol. Running or not most are impossible to adjust while installed.

It's just a simple project and experiment for me.

I am modifying the fuel meter cover so that a fuel pressure gauge can be easily connected and disconnected.

 

ownor - The AFPR I'm using is not vacuum referenced and it's not an xtremeFI unit. It's a stock regulator modified to make it adjustable.

RFMaster - Your idea of using a snake will probably work. I envision something along the lines of a short flexible drive with a **** on the end welded or epoxied to the adjustment screw. Things that make you go hmmm ...

 

Yes, indeed I've used flexible spring shafts for the transmission of rotational motion (moving sensor head), but for a 90 degree rotational transfer a miniature gear box is better suited. Something like this:
http://www.rinomechanical.com/pdf/ge...315gearbox.pdf
except that it can not handle extended temperature (max 80C!)

Flexible spring shaft can be used, but its bend radius will be substantial, which can be accommodated with a careful routing.

//RF

 

89irocz28, actually i was referring to the regulator being in the stock location, like the xtremeFI one is. but neither on is a vafpr, so that would be a valuable addition to the TBI community and might be something for Sean (dctrumpet, if i remember correctly ) to look into.

 

ownor,
xtremefis AFPR is a stock one modified to be adjusted using the stock componets dont get fooled by his pics and statements, do not buy the diapram he sells it is not the exact replacement you need and dont buy his AFPR springs they dont mach the stated psi at all.

 

ok thanks for the info, but anyways i wasn't planning on buying one from xtremeFI just using it as a "reference" (?) - it's just an adjustable stock regulator after all right?