bad fuel pressure regulater?

[60dgrzbelow0]

That one (listed for the 3.4 Camaro - not sure why the pic is so small) is only $67 from Rock Auto.

But Brad... The one listed in that image from my last post IS from RockAuto... Oh wait...YEEEEEESSSSSS! How about THAT! I LOVE being wrong when it will save somebody (ME2) some $$$. And ...I can see that I am in error in thinking that the two rail designs between the 3.4L and the 3.1L were the same... My Bad!

[60dgrzbelow0]

Without knowing whether or not you already possess this tool kit... or whether or not the FPR you are fixing has either the spring-clip locking design or the early model "Torx Security Screws" design like the VIN "S" Fuel Rail, here are some close-up images to show why they require this special tool to replace the rubberized fabric bladder. (See Attached Images...)

[tkoforpresident]

Bob, why don't you buy a Holley Adjustable Fuel Pressure Regulator for your build?

I have an extra hose kit you could have for free. You would just need to buy the holley fpr and an autometer gauge so you know what psi your at.

also, OP. I have a stock 3.4 FPR thats working fine if you want it but i don't know if you have the same kind on your car.

[60dgrzbelow0]

Bob, why don't you buy a Holley Adjustable Fuel Pressure Regulator for your build?

I have an extra hose kit you could have for free. You would just need to buy the holley fpr and an autometer gauge so you know what psi your at.

also, OP. I have a stock 3.4 FPR thats working fine if you want it but i don't know if you have the same kind on your car.

Max... I am interested in your kit and can PayPal you the $$$ for it. I'm also very curious about your set up with the Holley Unit. Would you email me with the specs and any install images please? This sounds like a good idea for you to do your own "How To" thread on the Holley install...

at60dgrzbelow0@yahoo.com

I saw the one you installed on your engine via your photo bucket images and was puzzled how you did that. Those images would be interesting to see attached to this post as very much On Topic. How did you handle the Fuel Pump issues? And lastly...am I going to get myself into "Trouble in Tooning Land" by putting it on... without the benefit of John or Robert's ODB I Harness and Lumina ECM? Oh... I just remembered... I bought an Adjustable FPR a while back... but was stumped until I saw your unique Holley Flange mount that replaces the Black "Top Hat" vacuum chamber and fuel bladder as to how to make it work in replacement of the oddly designed and built-in version on the stock GM Fuel Rail. I have included the photos... The hosing I have that came with it... is this similar to what you mentioned earlier? Can I get the portion that attaches to the GM Fuel Rail as a seperate item...and just use my present AFPR?

[robertisaar]

it's better to have something to adjust for changes, than nothing to adjust for changes...

if you don't do an OBD1(or hell even OBD2 if you want to engineer it) conversion, then i would highly suggest grabbing at least an AFPR to account for that cam you're running.

[60dgrzbelow0]

it's better to have something to adjust for changes, than nothing to adjust for changes...

if you don't do an OBD1(or hell even OBD2 if you want to engineer it) conversion, then i would highly suggest grabbing at least an AFPR to account for that cam you're running.

Sorry Robert... I was caught up in my prior response because I needed to take images of the AFPR unit...are you referring to my build as needing this done? (See my last entry for the new images)

[robertisaar]

you do have a bit of a cam correct? like a 252 or 260H?

[60dgrzbelow0]

you do have a bit of a cam correct? like a 252 or 260H?

Yes indeed... The Compcam 260H... turned via a Cloyes "True Roller" Timing Set and working the valve train via Crane Hydraulic Lifters while poking Melling Push Rods and tilting the valves held in place by the Heavy Duty Compcam Valve Springs, Retainers and Keepers while rotating open via Compcam's 1.52-1 Roller-Tipped Rocker Arm Set.

[robertisaar]

i forgot what i was getting at

since you already have a AFPR, just make sure it's put to good use.

[60dgrzbelow0]

i forgot what i was getting at

since you already have a AFPR, just make sure it's put to good use.

I will...if I can get my hands on the new Holley Gizmo that Max used to replace the FPR "Top Hat" and Rubberized Cloth Bladder-Polished Steel Flapper Valve inside that damned stock GM Fuel Rail. What is an "Autometer Gauge"? Does Max mean the analog readout pressure meter screwed into the side of my AFPR?

[tkoforpresident]

Bob....

Any AFPR for the 3rd Gen TPI motors will also work on the 3.4 - most are just caps with hex screws for adjustment. The Holley unit 512-501 replaces the internals and diaphragm as well and has an easy to use twist top. You can run up to ~60psi

it's about 100$ IIRC...

You will also need a mounted gauge to see what psi your at and the braided hose line kit (the one i can give you) to finish the job.

Autometer #2612 0-100psi mechanical gauge

thats what i have mounted in my engine bay^

heres some install pics for you to look at.

close up of holley afpr:



that braided hose wraps around to the autometer gauge that i have installed with a small bolt hanging from the cowl shown here:

[60dgrzbelow0]

Okay... Those images help... I found the Holley Unit online here:

http://www.holley.com/products.asp?product=512-501

But I'm puzzled as to why they show it for the 5.0L TPI GM cars...

Max...I saw the listing for the Autometer Gauge here... and as for the Braided Fuel Line Kit you offered... I can see that they are pretty pricey. Why not include your PayPal info in your next email to me... so I drop some $$$ on you and offset your costs plus S&H for this great item?

http://www.jegs.com/i/Auto%20Meter/105/2612/10002/-1?CT=999

And as for increasing the fuel pressure manually to the rail... How high is too high for the stock GM Rochester Multech 17103007 EFIs? Did you have to add an Electric Fuel Pump to bump the pressure to 60 PSI?

[tkoforpresident]

first off, it's 10$ cheaper at summitracing.com

the reason it's listed for the 5.0 is because we have the same fuel rail (or at least FPR opening) as those cars. It will work for both.

Buy the gauge from Jegs (46$) and then send me your address and i'll ship out that braided hose kit for you, complimentary of course

Finally, you don't need to upgrade the fuel pump for this mod. It might put a little more strain on it but the fuel rail is surely capable of 60 psi, in fact, i've run 60 psi before without any difficulty at all. Plus, since you can dial in your psi to whatever you want, you could set it anywhere from 43.5 (stock) all the way up to 60 psi or whatever your comfortable with.

keep in mind, changing psi will change the flow rate of the injectors. Using the newly found Witchhunter.com and it's flow rate calculator you can see how much your injectors will flow with each new pressure.

[60dgrzbelow0]

Holley adjustable fuel pressure regulator 512-501

All Good Information, Max...Thanks... and for the patience of the Original Poster, as well... (hope this is a useful alternative for you as well.)

I sent my information to your AIM email address. I can use the mounting bracket off of the other AFPR to fix it to the fire wall as you suggested. What an interesting design...it puts me in mind of a larger version of the Vernier Caliper adjuster mounted on the rifle site of a U.S. Army M1-Garand 30-06 Cal. Rifle... just turned sideways...LOL. Will I be able to get my Phat Phingers in that small area after the UIM is in place? If not...I can dummy up a sort of Strap Wrench to allow me some room to make the pressure adjustments. Thanks again for the AFPR Braided Hose!

The Witchhunter Calculator tells me that with just a tweak to 45 PSI...I'll be right at the level of 18.000X PSI to accommodate the slight increase in the cylinder volume with the engine bored out to 0.75mm and the 55-57 MM wider opening on the UIM Throttle Body. Nothing Earth-Shattering by the normal over-performance standards expected of the average power enthusiast here...but with the 260H cam and Pacesetter headers as a combination...it might push that little motor over 160HP...I think.


http://www.summitracing.com/parts/HL...1/?image=large

[tkoforpresident]

yes, and now you know why even being able to bump up psi 1.5 lbs it will be able to help you "fine tune" so to speak lol.

plus the gauge is helpful in case you run into any fuel pressure related issues in the future. Also, i like how the holley unit replaces the rubber piece that tends to wear out on our old ones and leak.