What size is the fuel pressure test port?

**alacran** · 05-08-2008

Is is -4 or -6 AN for the test port on the fuel rail?

**Reptile** · 05-08-2008

-4 AN

TDCRacing · 05-09-2008

ding ding ding or 1/8 inch npt i belive

**Reptile** · 05-09-2008

1/8 won't work, the threads are completely different.

**alacran** · 05-09-2008

How about this are the threads 7/16"? I called someone about the -4AN and they pointed me to a fitting and the threads are 7/16" because it fits some GM models. Sounds like it could thread on but i dont know if it will seal.

**Sabrewings** · 05-09-2008

AN thread - Wikipedia, the free encyclopedia

**Reptile** · 05-09-2008

Originally Posted by alacran

How about this are the threads 7/16"? I called someone about the -4AN and they pointed me to a fitting and the threads are 7/16". Sounds like it could thread on but i dont know if it will seal.

You will be running a risk of the fitting leaking. This is really something that you don't want to cheap out on. If you do a search for Russel fittings, you can get them from Jegs...they are the only ones that I recommend.