Third Generation F-Body Message Boards

TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
Sponsored by:
Sponsored by:

FPR: Is This Bad?

Thread Tools
 
Search this Thread
 
Old 07-07-2011, 07:47 PM
  #1  
Supreme Member

Thread Starter
 
FireDemonSiC's Avatar
 
Join Date: Apr 2008
Location: Dumfries, VA
Posts: 2,342
Received 23 Likes on 18 Posts
Car: 1985 Z28
Engine: 334 Stroker Superram 222/230
Transmission: Full Manual 700R4 / 3k Street Edge
Axle/Gears: 3.90 Eaton, Moser, Richmond & More
FPR: Is This Bad?
I was just poking around in the engine bay scouting my Plenum disassembly route, and when I removed the vaccum line that goes from the fuel pressure regulator to the back of the Plenum, there was fuel in it. Maybe It's just me being paranoid, but I don't recall this being a good thing in regards to the FPR diaphram. Can someone chime in on this?
FireDemonSiC is offline  
Reply Like
Old 07-07-2011, 07:50 PM
  #2  
Supreme Member

iTrader: (25)
 
Twin_Turbo's Avatar
 
Join Date: Jun 2000
Location: Enschede, Netherlands
Posts: 5,357
Received 42 Likes on 33 Posts
Car: 82 TA 87 IZ L98 88 IZ LB9 88 IZ L98
Engine: 5.7TBI 5,7TPI 5.0TPI, 5,7TPI
Transmission: T5, 700R4, T5, 700R4
Axle/Gears: 3.08, 3.27, 3.45, 3.27
Re: FPR: Is This Bad?
ruptured diaphragm, should be no fuel in the line
Twin_Turbo is offline  
Reply Like
Old 07-07-2011, 08:03 PM
  #3  
Supreme Member

Thread Starter
 
FireDemonSiC's Avatar
 
Join Date: Apr 2008
Location: Dumfries, VA
Posts: 2,342
Received 23 Likes on 18 Posts
Car: 1985 Z28
Engine: 334 Stroker Superram 222/230
Transmission: Full Manual 700R4 / 3k Street Edge
Axle/Gears: 3.90 Eaton, Moser, Richmond & More
Re: FPR: Is This Bad?
Originally Posted by Twin_Turbo
ruptured diaphragm, should be no fuel in the line
That's exactly what I thought. This causes the engine to run rich, correct?

Also, when purchasing an adjustable FPR such as a BBK unit, does it include the a diaphragm and all as a bolt on turn-key mod?
FireDemonSiC is offline  
Reply Like
Old 07-07-2011, 08:06 PM
  #4  
Supreme Member

iTrader: (25)
 
Twin_Turbo's Avatar
 
Join Date: Jun 2000
Location: Enschede, Netherlands
Posts: 5,357
Received 42 Likes on 33 Posts
Car: 82 TA 87 IZ L98 88 IZ LB9 88 IZ L98
Engine: 5.7TBI 5,7TPI 5.0TPI, 5,7TPI
Transmission: T5, 700R4, T5, 700R4
Axle/Gears: 3.08, 3.27, 3.45, 3.27
Re: FPR: Is This Bad?
yes, the fuel gets sucked into the TB causing a rich condition.

Yes, adjustables are all complete ready to bolt on.
Twin_Turbo is offline  
Reply Like
Old 07-07-2011, 08:13 PM
  #5  
Supreme Member

Thread Starter
 
FireDemonSiC's Avatar
 
Join Date: Apr 2008
Location: Dumfries, VA
Posts: 2,342
Received 23 Likes on 18 Posts
Car: 1985 Z28
Engine: 334 Stroker Superram 222/230
Transmission: Full Manual 700R4 / 3k Street Edge
Axle/Gears: 3.90 Eaton, Moser, Richmond & More
Re: FPR: Is This Bad?
Originally Posted by Twin_Turbo
yes, the fuel gets sucked into the TB causing a rich condition.

Yes, adjustables are all complete ready to bolt on.
I just looked all over the net and couldn't find any mention of whether or not the BBK 1714 kit comes with a diaphragm. However, when I looked the part up on summit it said in the notes, "Must re-use stock diaphragm and spring assembly"
FireDemonSiC is offline  
Reply Like
Old 07-07-2011, 08:38 PM
  #6  
Supreme Member

iTrader: (25)
 
Twin_Turbo's Avatar
 
Join Date: Jun 2000
Location: Enschede, Netherlands
Posts: 5,357
Received 42 Likes on 33 Posts
Car: 82 TA 87 IZ L98 88 IZ LB9 88 IZ L98
Engine: 5.7TBI 5,7TPI 5.0TPI, 5,7TPI
Transmission: T5, 700R4, T5, 700R4
Axle/Gears: 3.08, 3.27, 3.45, 3.27
Re: FPR: Is This Bad?
Oh those are only hats w/ a screw to adjust it then, figured you meant a complete FPR
Twin_Turbo is offline  
Reply Like
Old 07-08-2011, 03:11 AM
  #7  
Supreme Member

Thread Starter
 
FireDemonSiC's Avatar
 
Join Date: Apr 2008
Location: Dumfries, VA
Posts: 2,342
Received 23 Likes on 18 Posts
Car: 1985 Z28
Engine: 334 Stroker Superram 222/230
Transmission: Full Manual 700R4 / 3k Street Edge
Axle/Gears: 3.90 Eaton, Moser, Richmond & More
Re: FPR: Is This Bad?
I was checking and it looks like advance auto sells the diaphragm:

http://shop.advanceautoparts.com/web...674035144____#

But, look at the one comment:

This will not work with the chevy Fuel Pressure Regulators, they are a sealed unit..........you will need to replace the hole unit.
Has this guy lost his mind? I thought one you removed the allen screws the FPR "hat" comes off to expose the diaphragm?
FireDemonSiC is offline  
Reply Like

Trending Topics

Old 07-13-2011, 02:05 AM
  #8  
Supreme Member

Thread Starter
 
FireDemonSiC's Avatar
 
Join Date: Apr 2008
Location: Dumfries, VA
Posts: 2,342
Received 23 Likes on 18 Posts
Car: 1985 Z28
Engine: 334 Stroker Superram 222/230
Transmission: Full Manual 700R4 / 3k Street Edge
Axle/Gears: 3.90 Eaton, Moser, Richmond & More
Re: FPR: Is This Bad?
When I removed the diaphragm, this is what it looked like. What would cause the rubber to rot out like this?
Attached Thumbnails FPR: Is This Bad?-img_20110713_030133.jpg  
FireDemonSiC is offline  
Reply Like
Old 07-13-2011, 10:09 AM
  #9  
Junior Member

iTrader: (2)
 
GTA90X's Avatar
 
Join Date: Jul 2008
Location: NE Ohio
Posts: 70
Received 0 Likes on 0 Posts
Car: 1990 GTA
Engine: stock L98(being pulled for rebuild)
Transmission: stock 700R4
Axle/Gears: 3.23
Re: FPR: Is This Bad?
Originally Posted by FireDemonSiC
When I removed the diaphragm, this is what it looked like. What would cause the rubber to rot out like this?
Age, heat and constant exposure to gasoline. Nothing lasts forever
GTA90X is offline  
Reply Like
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
88 Camaro pulls to right when braking
AmpleUnicorn88
Brakes
32
11-18-2015 11:02 AM
LEGIT sellers of 3rd gen parts?
3rdgenkindagal
Aftermarket Vendor Review
25
10-21-2015 09:32 AM
Random miss at idle (video)
L98GTA87
TPI
18
10-19-2015 10:43 PM
Theoretical questions on gear contact pattern
dimented24x7
Transmissions and Drivetrain
7
09-17-2015 06:58 AM
factory wiring basic question 89 firebird gta
gta892000
Electronics
1
09-16-2015 12:40 AM
Back to Subforum
TPI
View Next Unread
car will not keep consistant fuel pressure




Advanced Search
Quick Reply: FPR: Is This Bad?


Reply Closed Thread Share

All times are GMT -5. The time now is 04:58 AM.