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


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1989 IROC-Z 5.7L fuel system overhaul

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Old 04-15-2018, 12:59 PM   #1  
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Car: 1989 IROC-Z 5.7L
Engine: 5.7L 350
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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
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Old 04-15-2018, 01:14 PM   #2  
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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.
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Old 04-15-2018, 01:52 PM   #3  
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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
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Old 04-15-2018, 02:31 PM   #4  
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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.
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Old 04-15-2018, 02:42 PM   #5  
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Re: 1989 IROC-Z 5.7L fuel system overhaul

Is there a different fuel tank you would recommend?
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Old 04-15-2018, 02:42 PM   #6  
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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.
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Old 04-15-2018, 02:51 PM   #7  
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Re: 1989 IROC-Z 5.7L fuel system overhaul

Here’s a few other options



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Old 04-15-2018, 02:56 PM   #8  
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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.
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Old 04-15-2018, 07:16 PM   #9  
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Re: 1989 IROC-Z 5.7L fuel system overhaul

Quote:
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.
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Old 04-15-2018, 09:42 PM   #10  
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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=
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Old 04-18-2018, 07:44 AM   #11  
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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?
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Old 04-18-2018, 09:23 AM   #12  
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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.
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Old 04-18-2018, 11:03 AM   #13  
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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!
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Old Yesterday, 03:43 PM   #14  
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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.

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Old Yesterday, 03:50 PM   #15  
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Re: 1989 IROC-Z 5.7L fuel system overhaul

Did the pump come with the install kit (sock and pigtail ).
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Old Yesterday, 03:51 PM   #16  
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Re: 1989 IROC-Z 5.7L fuel system overhaul

Him I'll look- Do you have a pic of what this would look like?
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Old Yesterday, 03:55 PM   #17  
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Re: 1989 IROC-Z 5.7L fuel system overhaul


Last edited by Tuned Performance; Yesterday at 03:58 PM.
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Old Yesterday, 04:25 PM   #18  
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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!
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Old Yesterday, 06:27 PM   #19  
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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.
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Old Yesterday, 06:43 PM   #20  
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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.
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