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Old 09-15-2018, 12:22 PM   #1
josephmichael09
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Fuel inlet TBI O-rings

I just finished rebuilding my TBI Model220. I did not see any o rings of any type when I removed the fuel inlet ports on the back of the throttle body. Is this normal? When I turn the engine over Iím noticing a fuel leak at one of the fuel ports. What size would they be?
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Old 09-15-2018, 02:28 PM   #2
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Re: Fuel inlet TBI O-rings

What Iím finding is that the threads on the fuel inlet on the meter body and a bit stripped out! What are my options in repairing this? It tightens up enough but I donít want to over tighten and strip out whatís left. I was thinking about putting some kind of sealant over the threads and allowing it to cure before pressurizing the gas line again.

I know... I know... not how itís supposed to be done but I donít want to thread it oversized and find this and find that. However, if itís my only option, then I donít have any other choice. Any thoughts?
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Old 09-15-2018, 02:32 PM   #3
Palf70Step
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Re: Fuel inlet TBI O-rings

Myself, I think I would try and find another unit that hasn't been buggered up. Thewre are tons of these trucks in the yards, you should be able to find a good one to work from.

I have never rebuilt one, so I don't know tyhe details of the hookup. Hopefully some of the smart folks will chime in for ya.
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Old 09-15-2018, 09:19 PM   #4
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Re: Fuel inlet TBI O-rings

You have an oring on the fuel line going both in and out. On the fittings that go into the TBI you have a Teflon washer that should go on both the feed and return line.
I had to purchase a rebuild kit to get the washers.
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Old 09-15-2018, 09:40 PM   #5
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Re: Fuel inlet TBI O-rings

The fitting itself or the line is leaking ?

The braided lines are a 16x1.5 for inlet and a 14x1.5 for return.

I just order a set of these to a -6an male for an easy conversion to my fitech unit.


The bad is, i tossed my tbi unit as i thought everyone considered them junk...didnt realize so many people used them for anything.
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Old 09-17-2018, 08:04 AM   #6
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Re: Fuel inlet TBI O-rings

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Originally Posted by mikebte View Post
You have an oring on the fuel line going both in and out. On the fittings that go into the TBI you have a Teflon washer that should go on both the feed and return line.
I had to purchase a rebuild kit to get the washers.

Teflon was her huh? I didnít see that during the rebuild nor in the rebuild kit. The leaking is coming from the fuel inlet fitting. The threads were damaged. Iím thinking about going to a junk yard to try and find the meter body and replace it. Itís good to know there is a washer that goes on that fitting.

However, Iíve done some searching around and canít find that fitting anywhere at all! I only found 1 article of some guy with an 84 that rebuild his TBI and couldnít find that same washer. If I canít find them at the junk yard when I remove the Meter Body, Iím thinking about laying out some wax paper, pouring out a bunch of fuel resistant gasket maker, letting in harden and cure, and cutting out a washer. Iím wondering if this will work... Iím really hoping I come across that because I didnít see a Teflon washer of any kind in the rebuild kit.
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Old 09-17-2018, 08:53 AM   #7
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Re: Fuel inlet TBI O-rings

After a bit more research, I learned that Teflon washers are also known as PTFE. These washers are fairly easy to find. Once I find the meter body that I need, Iíll just run by ace hardware and find the correct sized washer.

Also, on the fuel line wth the flaired fitting, does this take an o ring as well? I thought the flaired end creates the seal.
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Old 09-17-2018, 11:12 AM   #8
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Re: Fuel inlet TBI O-rings

Oring and washers needed
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Old 09-17-2018, 12:13 PM   #9
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Re: Fuel inlet TBI O-rings

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Originally Posted by mikebte View Post
Oring and washers needed


Mike, you’re an effin champ! Thanks.

Last edited by josephmichael09; 09-17-2018 at 12:18 PM.
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Old 09-17-2018, 04:54 PM   #10
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Re: Fuel inlet TBI O-rings

Iím pretty stoked guys! I came to the junk yard immediately after work and found the part I needed! I would have taken the entire throttle body but the people who got to it before me already destroyed it. They removed the injectors and misplaced the cover that goes over the top. Also, being an electrician, I donít have all the tools I need to take everything out. Just need to clean her and let her soak...

Only thing that upsets me is the junkyard charges for a full throttle body part!!!

Assholes!
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Old 09-17-2018, 06:44 PM   #11
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Re: Fuel inlet TBI O-rings

Sucks, but at least you got everything you need
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