1989 IROC-Z 5.7L fuel system overhaul - Third Generation F-Body Message Boards

Go Back  Third Generation F-Body Message Boards > Tech Boards > TPI
Reload this Page >

1989 IROC-Z 5.7L fuel system overhaul

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

1989 IROC-Z 5.7L fuel system overhaul

Reply

Old 04-15-2018, 01:59 PM
  #1  
Junior Member
Thread Starter
 
Join Date: Apr 2018
Posts: 20
Car: 1989 IROC-Z 5.7L
Engine: 5.7L 350
Transmission: Automatic
1989 IROC-Z 5.7L fuel system overhaul

I have a 1989 IROC-Z 5.7L that has been sitting in various garages for ~ 10 years for various reasons (deployments, kids, etc...) that I am FINALLY getting into. I have diagnosed that the fuel pump is faulty, and wanted to pursue a fuel system overhaul (tank, fuel pump assembly, lines, regulator, etc.) over the course of the next few months. I've been looking around online and see a number of people recommending the Walbro 255LPH pump, but cannot seem to find a kit for the whole assembly with it. I'm reluctant to go start ordering parts before I have some confidence I am ordering the correct ones for my particular vehicle. My question:

Any part numbers available for fuel pump/lines/kits?
What brand is recommended?

I will follow up with pictures.

-Jason
YeahmanIROC is offline  
Reply With Quote
Old 04-15-2018, 02:14 PM
  #2  
Sponsor
iTrader: (80)
 
Tuned Performance's Avatar
 
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 10,876
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: 1989 IROC-Z 5.7L fuel system overhaul

Acdelco ep241 is a good pump, if your going through the whole fuel system check out southbay fuel injectors and fuel rail o-ring kit.
Tuned Performance is offline  
Reply With Quote
Old 04-15-2018, 02:52 PM
  #3  
Junior Member
Thread Starter
 
Join Date: Apr 2018
Posts: 20
Car: 1989 IROC-Z 5.7L
Engine: 5.7L 350
Transmission: Automatic
Re: 1989 IROC-Z 5.7L fuel system overhaul

SO- As of now I am looking at:

ACDelco EP241 Fuel pump
AM Autocrats fuel sending unit
14 Gallon gas tank with neck.

Enough to get me working at least right? Any recommendations/alterations?

Still plan on pursuing :
Fuel injectors
Fuel lines (as I see damaged ones, etc.)
Fuel regulator

Thanks!

Jason
YeahmanIROC is offline  
Reply With Quote
Old 04-15-2018, 03:31 PM
  #4  
Sponsor
iTrader: (80)
 
Tuned Performance's Avatar
 
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 10,876
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: 1989 IROC-Z 5.7L fuel system overhaul

I havenít heard of those brands for fuel tank/sender.
the only think I would check would be the gas cap fit before installation. Some members have had to file down the threads for aftermarket tanks.
Tuned Performance is offline  
Reply With Quote
Old 04-15-2018, 03:42 PM
  #5  
Junior Member
Thread Starter
 
Join Date: Apr 2018
Posts: 20
Car: 1989 IROC-Z 5.7L
Engine: 5.7L 350
Transmission: Automatic
Re: 1989 IROC-Z 5.7L fuel system overhaul

Is there a different fuel tank you would recommend?
YeahmanIROC is offline  
Reply With Quote
Old 04-15-2018, 03:42 PM
  #6  
Junior Member
Thread Starter
 
Join Date: Apr 2018
Posts: 20
Car: 1989 IROC-Z 5.7L
Engine: 5.7L 350
Transmission: Automatic
Re: 1989 IROC-Z 5.7L fuel system overhaul

And- on the sender- I would be open to any brands anybody can recommend. This just seems to be all I can find at the moment.
YeahmanIROC is offline  
Reply With Quote
Old 04-15-2018, 03:51 PM
  #7  
Sponsor
iTrader: (80)
 
Tuned Performance's Avatar
 
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 10,876
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: 1989 IROC-Z 5.7L fuel system overhaul

Here’s a few other options



Tuned Performance is offline  
Reply With Quote
Old 04-15-2018, 03:56 PM
  #8  
Supreme Member
iTrader: (28)
 
Drew's Avatar
 
Join Date: Jul 1999
Location: Salina, KS
Posts: 16,916
Re: 1989 IROC-Z 5.7L fuel system overhaul

Rumor has it that the aftermarket tanks fit poorly, and lack the internal baffling of the later TPI tanks. Unless the tank is rusty, I'd stick with the stock tank.

My project car's plates expired in 2009. Aside from some stink, and some flakes, the inside of the tank wasn't too awful bad. I soaked up as much of the old rotten gas possible with paper towels, then hosed the thing out thoroughly with Dawn and water. A bit of scrubbing where I could get at nasty deposits, some shots of cheap carb cleaner, etc got the last of the nasty out. After everything was dry, the loose flakes of whatever were easy enough to vacuum out. A ShopVac with a short garden hose or 4ft length of heater hose duct taped to the crack and crevice tool made it easy to reach the far corners inside the tank.

The Walbro tank that is most referenced is the GSS-340. It's a 255lph high pressure pump. Unless you're running a lot of mods (power adder, NOS, supercharger, turbo) you probably don't need that much pump, and you'll probably find it noisy. http://autoperformanceengineering.co...s.html#gm_apps is a proven vendor if you want to go that way. Personally, I went to Rock Auto and ordered a stock replacement pump. If you want to get fancy the 89 Turbo Trans Am/GN/Sy-Ty pumps are drop in replacements with theoretically higher pressure/volume, whatever...

Don't use the single sided fuel pump sock filter strainer. Look for the one that's twice as long with the pump clamp in the middle. The longer strainer is the 1LE type used in all the later tpi cars, but the short single sided part is often substituted and is a downgrade.
You want the ACDelco TS18 or TS44 (4th gen).





Beyond that, a new filter and a good set of injectors is always a good idea. I wouldn't mess with the rest unless it's actually causing a problem. At most I'd flush and blow out the lines.
Drew is offline  
Reply With Quote
Old 04-15-2018, 08:16 PM
  #9  
Sponsor
 
southbay08's Avatar
 
Join Date: Nov 2008
Location: Rockville Centre, NY
Posts: 1,311
Re: 1989 IROC-Z 5.7L fuel system overhaul

Originally Posted by Tuned Performance View Post
Acdelco ep241 is a good pump, if your going through the whole fuel system check out southbay fuel injectors and fuel rail o-ring kit.

thanks Brian!
we have all fuel compatible fuel line..regulators, and injectors if need be. If you are interested in purchasing from us keep in mind that all tgo members receive 10% off. We'll be more than happy to help you.
southbay08 is offline  
Reply With Quote
Old 04-15-2018, 10:42 PM
  #10  
Moderator
iTrader: (1)
 
Abubaca's Avatar
 
Join Date: Feb 2001
Location: JAMESTOWN, NC
Posts: 6,755
Car: 1989 Iroc
Engine: 383 TPI
Transmission: TKO600
Axle/Gears: 3.27
Re: 1989 IROC-Z 5.7L fuel system overhaul

I have Southbay injectors too. ...as do a lot of us here on TGO.

...I'm with Drew on flushing and blowing out the lines. I don't think there's a need to replace them unless you NEED to.

....and I'd also look into the Racetronix hotwire kit. I bought this whole kit, with the pump, and harness and everything. Granted I NEEDED more pump, but I was getting some voltage drop at the pump and just decided to get the whole thing. Basically it's plug and play, and uses the 12v from the original relay, but instead of powering that pump, it simply triggers the new relay on the Racetronix harness. I ended up bypassing the OE relay all together, but it's designed to be plug and play, and to use that OE relay if you want.

http://www.racetronix.biz/customkiti...RFPK%2D005&eq=
Abubaca is offline  
Reply With Quote
Old 04-18-2018, 08:44 AM
  #11  
Junior Member
Thread Starter
 
Join Date: Apr 2018
Posts: 20
Car: 1989 IROC-Z 5.7L
Engine: 5.7L 350
Transmission: Automatic
Re: 1989 IROC-Z 5.7L fuel system overhaul

Just to make sure I order the correct sending unit- How can I determine my harness code?
YeahmanIROC is offline  
Reply With Quote
Old 04-18-2018, 10:23 AM
  #12  
Supreme Member
iTrader: (28)
 
Drew's Avatar
 
Join Date: Jul 1999
Location: Salina, KS
Posts: 16,916
Re: 1989 IROC-Z 5.7L fuel system overhaul

Look for the tag on the harness that plugs into the body above the transmission tunnel, in front of the gas tank. Pretty sure all the later cars are going to be the same sender, only the pumps and strainers are different.
Drew is offline  
Reply With Quote
Old 04-18-2018, 12:03 PM
  #13  
Junior Member
Thread Starter
 
Join Date: Apr 2018
Posts: 20
Car: 1989 IROC-Z 5.7L
Engine: 5.7L 350
Transmission: Automatic
Re: 1989 IROC-Z 5.7L fuel system overhaul

Awesome-Thanks. I think I'm going to try to go with the Spectra FG20A fuel sending unit with the Walbro GSS-340. As of now I plan on emptying the tank and cleaning/reusing it. I will blow all the lines and clean up anything that needs some attention. I will update with pictures!

-Hopefully I don't have any huge problems!
YeahmanIROC is offline  
Reply With Quote
Old 04-20-2018, 04:43 PM
  #14  
Junior Member
Thread Starter
 
Join Date: Apr 2018
Posts: 20
Car: 1989 IROC-Z 5.7L
Engine: 5.7L 350
Transmission: Automatic
Re: 1989 IROC-Z 5.7L fuel system overhaul

Well not off to a good start.... I got the pump and sending unit in the mail today. And it seems that the pump and the sending unit have different electrical connections. Am I just being stupid? Pics below.

YeahmanIROC is offline  
Reply With Quote
Old 04-20-2018, 04:50 PM
  #15  
Sponsor
iTrader: (80)
 
Tuned Performance's Avatar
 
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 10,876
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: 1989 IROC-Z 5.7L fuel system overhaul

Did the pump come with the install kit (sock and pigtail ).
Tuned Performance is offline  
Reply With Quote
Old 04-20-2018, 04:51 PM
  #16  
Junior Member
Thread Starter
 
Join Date: Apr 2018
Posts: 20
Car: 1989 IROC-Z 5.7L
Engine: 5.7L 350
Transmission: Automatic
Re: 1989 IROC-Z 5.7L fuel system overhaul

Him I'll look- Do you have a pic of what this would look like?
YeahmanIROC is offline  
Reply With Quote
Old 04-20-2018, 04:55 PM
  #17  
Sponsor
iTrader: (80)
 
Tuned Performance's Avatar
 
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 10,876
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: 1989 IROC-Z 5.7L fuel system overhaul


Last edited by Tuned Performance; 04-20-2018 at 04:58 PM.
Tuned Performance is offline  
Reply With Quote
Old 04-20-2018, 05:25 PM
  #18  
Junior Member
Thread Starter
 
Join Date: Apr 2018
Posts: 20
Car: 1989 IROC-Z 5.7L
Engine: 5.7L 350
Transmission: Automatic
Re: 1989 IROC-Z 5.7L fuel system overhaul

So I need that harness- And then I use that to tie it into the spectra fuel sender... got it. Thanks man!
YeahmanIROC is offline  
Reply With Quote
Old 04-20-2018, 07:27 PM
  #19  
Member
iTrader: (4)
 
Join Date: Jul 2004
Location: pa
Posts: 404
Car: 87 IROC
Engine: 350
Transmission: auto
Axle/Gears: 3.23
Re: 1989 IROC-Z 5.7L fuel system overhaul

When I did mine I got the tank and sender from Rock auto. Everything went together fine. But I went with the walbro pump. Called summit and told them what pump I wanted and what it was going into. No issues there either. Wish I'd have known about the longer screen tho.
zya5point0 is offline  
Reply With Quote
Old 04-20-2018, 07:43 PM
  #20  
Supreme Member
iTrader: (28)
 
Drew's Avatar
 
Join Date: Jul 1999
Location: Salina, KS
Posts: 16,916
Re: 1989 IROC-Z 5.7L fuel system overhaul

If you got the pump kit from APE that I linked to earlier, it should have come with the pigtail. Even the Ebay Chinese knock offs should come with a pigtail. Unless you ordered JUST the pump, contact your vendor.
Drew is offline  
Reply With Quote
Old 04-22-2018, 11:34 AM
  #21  
Senior Member
 
EDGE's Avatar
 
Join Date: Jan 2000
Location: Mississauga, Ontario Canada
Posts: 685
Re: 1989 IROC-Z 5.7L fuel system overhaul

Look here:

http://www.racetronix.biz/items.asp?...atus=0&Tp=&Bc=

Great kit and I got mine with a power tap and harness
EDGE is offline  
Reply With Quote
Old 07-03-2018, 08:14 AM
  #22  
Junior Member
Thread Starter
 
Join Date: Apr 2018
Posts: 20
Car: 1989 IROC-Z 5.7L
Engine: 5.7L 350
Transmission: Automatic
Re: 1989 IROC-Z 5.7L fuel system overhaul

Alright- Stuck again...

Fuel pump replaced, and the suspension is all still removed for cleaning/software replacement. I will address those questions on a separate post. But the car still will not fire. The engine is trying to start, but will not actually fire.
What I've done so far: Verified SAT spark by using the procedure in the Haynes manual (put distributor cable near body of car and watch the spark).
Checked that fuel is going to the engine by disconnecting the fuel line and observing fuel flow.

It seems to me that the fuel is not getting to the cylinders (clogged fuel injectors? Computer control signal? ) and I worry that the time the vehicle sat (~8 years) could have led to some clogging in the fuel rail.

Any guidance is appreciated.

Pics will follow soon! Thanks for everyone's help so far.

Jason
YeahmanIROC is offline  
Reply With Quote
Old 07-03-2018, 08:23 AM
  #23  
Junior Member
Thread Starter
 
Join Date: Apr 2018
Posts: 20
Car: 1989 IROC-Z 5.7L
Engine: 5.7L 350
Transmission: Automatic
Re: 1989 IROC-Z 5.7L fuel system overhaul

Not sure why it posted twice.... damn work computer!

Last edited by YeahmanIROC; 07-03-2018 at 09:05 AM. Reason: Duplicate
YeahmanIROC is offline  
Reply With Quote
Old 07-03-2018, 12:32 PM
  #24  
Moderator
iTrader: (1)
 
Abubaca's Avatar
 
Join Date: Feb 2001
Location: JAMESTOWN, NC
Posts: 6,755
Car: 1989 Iroc
Engine: 383 TPI
Transmission: TKO600
Axle/Gears: 3.27
Re: 1989 IROC-Z 5.7L fuel system overhaul

I'd put a fuel pressure gauge on the rail and confirm that you DO have pressure at the rail, and the it's good pressure. If you have that....I'd confirm the fuel is returning to the tank. I imagine you'd have way high pressure if fuel wasn't returning, but i'm just trying to cover your bases.

did you ever get new injectors? Stock 89 Multec injectors, having sat for years....ouch. ....and can you confirm the injectors are getting a fire/pulse signal? I bought a test light kit years ago, and while I rarely use it, it's proven invaluable when actually needed.
https://www.ebay.com/itm/9pc-Electro...cAAOSwsB9WCO3z
Abubaca is offline  
Reply With Quote
Old 07-03-2018, 07:27 PM
  #25  
Junior Member
Thread Starter
 
Join Date: Apr 2018
Posts: 20
Car: 1989 IROC-Z 5.7L
Engine: 5.7L 350
Transmission: Automatic
Re: 1989 IROC-Z 5.7L fuel system overhaul

Ok- please forgive my post formatting but Iím still in the garage. Fuel pressure is at 48psi at the test port and fuel injectors lit up when tested. I only tested one injector but figured they were all getting the same signal. Im struggling a bit here since it seems the fuel rail is getting SAT pressure and the injectors are being told to fire. Is this indicative of fuel injector clogging?
YeahmanIROC is offline  
Reply With Quote
Old 07-03-2018, 08:07 PM
  #26  
Sponsor
iTrader: (80)
 
Tuned Performance's Avatar
 
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 10,876
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: 1989 IROC-Z 5.7L fuel system overhaul

If you have spark and good fuel pressure. You have verified injector pulse it has to be faulty injectors.
Tuned Performance is offline  
Reply With Quote
Old 07-03-2018, 11:35 PM
  #27  
Supreme Member
iTrader: (28)
 
Drew's Avatar
 
Join Date: Jul 1999
Location: Salina, KS
Posts: 16,916
Re: 1989 IROC-Z 5.7L fuel system overhaul

What do the plugs look like? If you're cranking the engine, and it's not starting, but the injectors are pumping fuel, then the plugs will probably be wet and smell like raw gas. If they've been in there during a LOT of cranking, they'll get fouled out.
Drew is offline  
Reply With Quote
Old 07-04-2018, 08:36 AM
  #28  
Junior Member
Thread Starter
 
Join Date: Apr 2018
Posts: 20
Car: 1989 IROC-Z 5.7L
Engine: 5.7L 350
Transmission: Automatic
Re: 1989 IROC-Z 5.7L fuel system overhaul

Alright- I think the right course of action is to replace the Injectors, but this does get me started down the rabbit hole that I was honestly planning on attacking once the car was running. (Once the car is running I'll make a new thread I promise!)

Which Injectors?
-I think the answer you guys will likely give me is "depends on what you want..." so I guess I will really start to nail that down here.
My intention is to make it a show car (look pretty, sound good, and still function as a low end race car, although it would not see the track)
My budget is, well, ~15,000? I really don't have an overall budget but what I have is a monthly budget, so as it gets more expensive it just means I'll be an older guy sitting next to it in my $25 lawn chair at shows...

What I'd like to find is a build where someone turned a 350TPI into a ~350RWHP car and basically get their list of build parts.

For now- The injectors, this is what I was currently looking at. Please advise. https://www.southbayfuelinjectors.co...ctors-bosch-d3
Should I be selecting a higher #/hr now? Is 22 sufficient? I believe stock is 22.

Happy 4th! If any of you are in the Norfolk, VA I'm looking for a local network of Camaro nerds!

-Jason
YeahmanIROC is offline  
Reply With Quote
Old 07-04-2018, 08:51 AM
  #29  
Junior Member
Thread Starter
 
Join Date: Apr 2018
Posts: 20
Car: 1989 IROC-Z 5.7L
Engine: 5.7L 350
Transmission: Automatic
Re: 1989 IROC-Z 5.7L fuel system overhaul

Those injectors may be pontiac only.... I guess I should be looking at this set instead, which is a significant price difference. Gonna have to make dinner for the wife or something if I'm to pull this one off in the next few days!

https://www.southbayfuelinjectors.co...tors-1986-1992
YeahmanIROC is offline  
Reply With Quote
Old 07-04-2018, 08:59 AM
  #30  
Junior Member
Thread Starter
 
Join Date: Apr 2018
Posts: 20
Car: 1989 IROC-Z 5.7L
Engine: 5.7L 350
Transmission: Automatic
Re: 1989 IROC-Z 5.7L fuel system overhaul

YeahmanIROC is offline  
Reply With Quote
Old 07-04-2018, 11:58 AM
  #31  
Sponsor
iTrader: (80)
 
Tuned Performance's Avatar
 
Join Date: Dec 2004
Location: Mile High Country !!!
Posts: 10,876
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: 1989 IROC-Z 5.7L fuel system overhaul

You should run 22#hr injectors no need for 24s on a stock engine.
https://www.southbayfuelinjectors.co...ctors-bosch-d3 or the style you posted in post 29.
Tuned Performance is offline  
Reply With Quote
Old 07-04-2018, 12:34 PM
  #32  
Senior Member
 
Big&BadGTA's Avatar
 
Join Date: Jul 2013
Location: *member since 1999, I think - just can't remember my old name, and the big site crash...*
Posts: 675
Car: 89 GTA ASC Conv., Prev: 89 GTA 6.3L
Engine: 5.7L L98 TPI
Transmission: 700r4 Automatic
Axle/Gears: 3.27:1 w/ JG1 Options:B2L, N10, U1A
Re: 1989 IROC-Z 5.7L fuel system overhaul

Originally Posted by YeahmanIROC View Post
Those injectors may be pontiac only.... I guess I should be looking at this set instead, which is a significant price difference. Gonna have to make dinner for the wife or something if I'm to pull this one off in the next few days!

https://www.southbayfuelinjectors.co...tors-1986-1992
Iíve used those style now twice (got them elsewhere, but the same) and they were a drop-in item.

Those yellow or orange Bosch III injectors, no way would I ever use.
Big&BadGTA is offline  
Reply With Quote
Old 08-15-2018, 02:51 PM
  #33  
Junior Member
Thread Starter
 
Join Date: Apr 2018
Posts: 20
Car: 1989 IROC-Z 5.7L
Engine: 5.7L 350
Transmission: Automatic
Re: 1989 IROC-Z 5.7L fuel system overhaul

First and foremost, sorry for the delay. We had another baby and she their required some hospital time for a virus.

UPDATE- IT'S ALIVE!

Car now runs, but will not idle well. In fact without active gas pedal pushing it will stall out. I plan on checking fuel pressure with it running, any other suggestions?

I will start rear end/suspension overhaul next, once I close out this thread.

Says the video is too large, I will have to figure out how to compress it.
YeahmanIROC is offline  
Reply With Quote
Old 08-24-2018, 06:12 PM
  #34  
Junior Member
Thread Starter
 
Join Date: Apr 2018
Posts: 20
Car: 1989 IROC-Z 5.7L
Engine: 5.7L 350
Transmission: Automatic
Re: 1989 IROC-Z 5.7L fuel system overhaul

UPDATE TO THE UPDATE: After replacing the IAC, re-setting the TPS, and checking fuel pressure I was still having issues.
Then I went to check something in the vicinity of the distributor, and it spun................
There wasn't a bolt there to be tightened to hold the cap in place.
I adjusted it about 5 degrees, and the car fired near perfectly.

......I'll time the engine and then close this thread with a video (how do you upload videos? lol)
YeahmanIROC is offline  
Reply With Quote
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
turboguard
Tech / General Engine
4
08-09-2016 08:17 AM
Convoy25
Brakes
2
11-30-2010 03:00 PM
burn0ut305
Tech / General Engine
40
01-03-2009 05:07 PM
eric305TPI
TPI
4
08-04-2005 07:05 PM
str8ballin22
Car Audio
2
10-09-2002 08:06 PM


Thread Tools
Search this Thread
Quick Reply: 1989 IROC-Z 5.7L fuel system overhaul


Advertising
Featured Sponsors
Vendor Directory

Contact Us Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: