Gibbles

I'm installing an areomotive fuel pressure regulator to address some fueling issues with my engine mods.
I'm looking to convert the current fuel lines to AN fittings for new hard lines, i had purchased a full set of adapter to -6 AN for a standard TBI hoping they were the same, however they are not...

Anyone happen to know what threads the CFI throttle bodies use for fuel in and fuel out?
also the size of the fuel line fittings?

I can't find anything on it...

​​​​​​​Any assistance would be very appreciated.

ex-x-fire

Tbi use metric Saginaw o-ring type connections. CFI use a double flare style, 3/8 in & 5/16 out. I'm not sure what threads are. I guess you could go to the parts store & get a small length of 3/8 & 5/16 lines. They should come with the line nuts.

Gibbles

think the correct fitting would be "inverted flare"?

Looking at the universal fit fuel lines

Inlet for 3/8in = 5/8-18 in. inverted flare
(reference https://www.summitracing.com/parts/hly-34-22 )

5/16in fuel line = 1/2-20 in.
(reference https://www.summitracing.com/parts/hly-26-44 )

Trying to avoid taking the vette down if at all possible, truck is down right now due to dealing with some issues with the boat...

Gibbles

I found a thread reference stating that both the inlet and outlets are the same as a standard tbi's Outlet port.
Once you remove the factory adapter that is...
Thread: 12mm x 1.25
So I ordered 4x: https://www.summitracing.com/parts/EAR-991945ERL

I also ordered every other possible option that it could be incase this plan does not work...
Last week I spent a good $90 on fittings that were mostly wrong...

I'm glad summit is good on returns for unused parts...

Gibbles

also what I'm planning on doing is to have a Y block for the fuel inlet so each throttle body gets it's own feed line.
Then for the return lines, both throttle bodies will get their own exit into the FPR.

corvettenorway

http://www.technovelocity.com/chevyh..._delivery.html

Gibbles

thanks!
Just what I needed.

Gibbles

That was it "12mm x 1.25"

i set this up this weekend, so far so good.

I'm having some issues with the fuel pressure i believe to be with either the place i ran a vacuum line to, that or i need to order a new diagram for my second hand areomotive FPR.

Pretty much, randomly i got the full 21psi @ idle...
​​​​​​​I did not have the time to troubleshoot last night, so the car is parked until i figure out what's happening.

The gauge that came with the FPR was also giving me fits, so i tossed the old gauge i had been using onto the splitter on the inlet line...

Rough fit for now, i need to tweak the lines just a tad still, and then I'll hit them with the buffer for a little shine and hardening.

my solution to where the F to mount everything...