1994 GM P-30 TBI ?s

[Sledhead2]

So your saying the large steel fitting that threads into TBI leaked? or just the plug / gage ports?

[tayto]

ya there is 3 possible places it could leak from, where it goes into the fuel pod, where the hardline threads into or one of the ports to hook a fuel gauge up to. i have not used this fitting but they have been around for 15+ years, it is very possible you got a bad one.

it sounds like it's leaking from the npt ports, sounds like you used the wrong dope or didn't tighten them enough. my solution for a leaking npt fitting has always been just tighten it down more until it stops.

[udidwht]

So your saying the large steel fitting that threads into TBI leaked? or just the plug / gage ports?

The gauge ports. Permatex 2 used.

[Sledhead2]

Ok, Seeing it is the NPT gag ports get something like this shown below. My thinking is the gage ports were tapped a little to deep and that when you put plugs or gage in you are not getting the proper interference fit with the treads.

Permatex 2 is not gasoline résistance.

They do sell very small tubes of this stuff at home depot and other places

https://www.zoro.com/loctite-pipe-se...specifications

[PlayingWithTBI]

Meh, I just used Teflon tape, had it on for ~4 years now with no runs, drips, or errors
IMG_0833.jpg

[tayto]

ya i use the yellow "gas" teflon tape or actual thread sealant. I used that aviation form a gasket stuff in my younger days, but it doesnt seem to hold up well to oil.

[udidwht]

Ok, Seeing it is the NPT gag ports get something like this shown below. My thinking is the gage ports were tapped a little to deep and that when you put plugs or gage in you are not getting the proper interference fit with the treads.

Permatex 2 is not gasoline résistance.

They do sell very small tubes of this stuff at home depot and other places

https://www.zoro.com/loctite-pipe-se...specifications

Permatex 2 is indeed gasoline resistant.


https://www.permatex.com/products/ga...sealant-11-oz/

[Sledhead2]

Permatex 2 is resistant, not gas proof. Get some Teflon tape or pipe sealant and you should be good to go.

[tayto]

https://www.permatex.com/products/th...sealant-50-ml/

this a real thread sealant. i use it on everything automotive from head bolts that go into coolant, intake bolts into oil, carb fittings etc

[udidwht]

https://www.permatex.com/products/th...sealant-50-ml/

this a real thread sealant. i use it on everything automotive from head bolts that go into coolant, intake bolts into oil, carb fittings etc

Have a tube of that and ordered some Gasoila.

[udidwht]

Update:

I used Permatex High performance thread sealant on the plug and Gasoila E-Seal on the adapter fitting. No leaks. We can right this one off in the history book.

[tayto]

good stuff