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TBI Leaking from top, at rubber seal...pics included to show where


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#1 83Starion-11

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Posted 09 March 2014 - 07:12 PM

I have a stock 83' which was running great for 5 years, and all of a sudden, my fuel stars to leak out of the TBI...literally coming out like a sprinkler...


I have taken apart the entire TBI and replaced the gaskets, but there seems to be a ton of pressure on top causing it to spew from the rubber seal...does anyone know why there may be pressure?  I have attached a picture, it is the rubber seal on the outside there which I know goes inside, and it is leaking very badly when turning the car over...why is there so much pressure in there to begin with?  Could I have bad injectors?


-Andrew

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  • Attached File  3213.jpg   47.98K   70 downloads






#2 scott87star

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Posted 09 March 2014 - 07:53 PM

There is supposed to be 36 psi pressure, I take it there is.  83's are unique, I have no experience, but I'd start with the o-rings on the top of the injectors.
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#3 ZacMan

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Posted 10 March 2014 - 12:33 AM

Your picture doesn't make it very clear as to where the fuel is leaking from, can you indicate it somehow?

If the problem occurred suddenly, I would bet it's the injectors themselves that have begun to leak, specifically where the wiring enters them. There isn't really an easy fix for this, unfortunately.

#4 83Starion-11

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Posted 10 March 2014 - 12:46 AM

Ya sorry, it is right where the wires are going into the TBI for the injectors :/ I am not sure what to do from here...and I have replaced all O-rings on injectors...I read that if the injectors are plugged or bad it can cause pressure to build up and blow out the top?

#5 MikeMeyerhoff

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Posted 10 March 2014 - 07:34 PM

There is a return line and a pressure regulator that prevents excess fuel pressure.  If your return line is clogged then yes,  fuel injectors clogged then no.
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#6 ZacMan

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Posted 13 March 2014 - 04:08 AM

You might need to replace more o-rings than just the ones on the injectors.

http://prozac.orconh...de/rebuild.html

I'd suggest it's either the 56mm o-ring, or the injectors themselves. I really hope it's the o-ring, as finding good early style injectors is nigh on impossible.

#7 83Starion-11

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Posted 26 March 2014 - 12:09 PM

ZacMan, I was able to get the exact O-rings for the car from the list, and just put them in yesterday, and no leak anymore! The injectors look to be flowing well. Thank you!

-Andrew

#8 markhansenconquest

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Posted 26 March 2014 - 10:58 PM

Throttle shaft seals .....look to be the same as 86-89 .. Talk to brian from LSP  has new ones......... 1buck each plus shipping ...ask brian if they will fit.....and get o -rings for gas inlet flange.....if u don't replace ....  will allways have a leak....

#9 ZacMan

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Posted 27 March 2014 - 12:06 AM

Awesome news! The throttle shaft seals are the same between the two types of injection mixer.

#10 markhansenconquest

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Posted 27 March 2014 - 12:41 AM

Glad to help u out.........I"ve   rebuield   3 TBs and they have all needed them ........(cooked from time and heat)

#11 chris brasher

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Posted 07 April 2020 - 07:37 PM

i am having the same issue with my 83 starion with the ECI unit.................... where can i find a rubber oring set at? thanks please help....

#12 BuGG

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Posted 05 May 2020 - 12:06 AM

The same place we told you in all the other threads you commented on about this same subject.
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#13 Tim_C.

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Posted 11 June 2020 - 09:57 PM

View PostBuGG, on 05 May 2020 - 12:06 AM, said:

The same place we told you in all the other threads you commented on about this same subject.

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