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Hks Fuel Rail Fitting

Hanaldo

By Hanaldo,
in Exterior & Interior Styling

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Hanaldo Grand Master

Hanaldo

Posted
Posted

Hey all,

I have no friggin clue where was best to ask this question, so figured I would just post it here seeing as it is for cosmetic purposes.

While I was installing my HKS fuel rail, I did up the blanking plug for the centre return line with a 6mm allen key. I was only intending to have it in there to stop anything getting in while I was working on the car, but of course I promptly forgot about it. When I then primed the fuel rail to check for leaks, this plug is now leaking. Only a tiny bit but I have this thing about fire in my engine bay, I'm sure you understand.

The issue is, when I went to take the plug out to put some Loctite thread sealant on it (as I should have just done when I put it in, don't know why I didn't), I discovered that the damn thing isn't actually a 6mm allen key, and I've now rounded it. So I need to get a new one. But, I'm not 100% sure on the sizes. Does anyone know if it is a 6.5 or 7mm allen key that I need? AND, I'm assuming that it is a -6 AN thread, same as the other fittings that came with the rail? So a -6 AN Speedflow plug would be perfect?

Thanks for any help,

Martin.

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ARTZ Grand Master

ARTZ

Posted
Posted

that plug f**king sucks man, I had the same problem..but i had used a thread seleant as well so it took a while to actually leak..

first it took me 2 weeks to track down the bung because it is a -6 size fitting but mine had a really fine thread on it that I couldnt find anywhere..

when i finally got one one the new problem is if i did it up too tight the o-ring would squish out, but if i didnt tighten it enough it wouldnt seal properly and I was advised not to use loctite as its not fuel resistant or something..i did get some other threadlocker that is but i still didnt trust it.

Anyway long story short, I got sick of it and just welded the f**king thing in there...doesn't look pretty but problem solved... :thumbsup:

check the thread though, chances are its not a regular -6 thread..got a pic..

Hanaldo Grand Master

Hanaldo

Posted
  • Author
Posted

that plug f**king sucks man, I had the same problem..but i had used a thread seleant as well so it took a while to actually leak..

first it took me 2 weeks to track down the bung because it is a -6 size fitting but mine had a really fine thread on it that I couldnt find anywhere..

when i finally got one one the new problem is if i did it up too tight the o-ring would squish out, but if i didnt tighten it enough it wouldnt seal properly and I was advised not to use loctite as its not fuel resistant or something..i did get some other threadlocker that is but i still didnt trust it.

Anyway long story short, I got sick of it and just welded the f**king thing in there...doesn't look pretty but problem solved... :thumbsup:

check the thread though, chances are its not a regular -6 thread..got a pic..

This doesn't inspire me with confidence :/

If it's not -6 thread then it's most likely not AN, would be something similar. Why HKS have made this plug so obscure seems strange to me, I'm struggling to find the 6.5mm allen key as well. I don't want to weld it up or do anything permanent because I do plan on running twin-entry in the future. Hadn't heard about Loctite thread sealant not being fuel resistant either, that could be a problem too.

why is this in cosmetic...??

I didn't know where else to put it!? Lol. I figured it's not really a performance question, and it's not really a maintenance question... It's not really a cosmetic question either, but I bought the rail for cosmetic purposes so I thought I'd continue with that :P

ARTZ Grand Master

ARTZ

Posted
Posted

no its norhing similar, its some obscure metric thread..The reason the thread is ver fine is because it has to bite into a fairly thin piece of rail..if it was a regular thread it wouldn't have enough holding to bite solidly..mine wsnt a HKS it wad a PFE rail, they could be different..if you show me a pic I can get you a bung if it's the same. Or any pipe place like Enzed and some Auto stores that stocks PFE (proflow) fittings will be able to get it, they will most probably have to order it in though..

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