De4n0

This is sorted now, see another question below


Hello, so I'm going to be fitting a surge tank and replacing all of my fuel lines with braided lines, the only problem I'm having is the surge tank has an8 fittings, this will mean the inside diameter of the pipe is around 10mm, the OD will be around 16-18mm ish.

How do people go about connecting them to the standard fuel rail? Will be going onto a st170 fuel rail and uses push on fitment at the minute but 10mm ID pipe is going to be far to big, if I was to get AN fittings to convert the size of the pipe when I gets to the fuel rail and use a smaller pipe, would pushing the pipe onto the original fittings be substantial enough or is there other AN fittings I can get?

I might not have made a whole lot of sense so if your unsure please ask, I really want to order my fuel hose ASAP and don't want to order the wrong one.

For e.g. Could I run the bigger line off the surge tank, then when it's run under the boot, use an an8-an4 male connector with an8 and an4 female fittings to change from the bigger pipe to the smaller one, then run the smaller pipe down the original fuel line route to the fuel rail and...IM STUCK!

higgsy91

I don't understand... Are you confused with what size pipe you need?
An8 hose fits to an8 threads..
If you need to find out what size you need for connecting to a solid fuel line then measure the diameter and search for an fittings on wikipedia. This will give you a handy chart to tell you what size hose you need.

De4n0

Im good with the size of the fuel line but the an8 fittings i have and have seen on youtube videos etc... use quite a thick pipe, i just have no idea how to secure it to the injector rail properly, thanks for the reply mate

muz

Have a JIC/AN fitting welded on the rail? That's what I did.

higgsy91

Yeah if this is what you were asking about then I'd do this too. You can pick up a weld on fitting for around a five on what from torques_uk

De4n0

Sounds good to me, is the st170 injector rail mild steel?, thanks everyone

higgsy91

No idea on that one lol

muz

It'll be aluminium, mate.

De4n0

Just stook a magnet on it and it seems to be mild steel, weld on adapters ordered and can get them tig welded at work so happy days

I will be fitting this to a zetec black top as I'm using half an st170 inlet manifold and custom plenum, the st170 injector rail "apparently" doesn't have a fuel return line, instead it has a fuel pressure regulator to work with the fuel pump, I'd be looking to get rid of that as I don't think the zetec black top uses one or at least not the same one on the fuel rail, and I'll weld in the adapter in its place, can anyone correct me on anything that would prevent this from working. Thanks

higgsy91

This is correct. The St uses a return less system controlled by an electronically operated fuel pressure regulator!
So what car is this going into? Why didn't you start with the blacktop rail?

De4n0

Its going onto a focus mk1 2.0l zetec turbo and i thought to use the st170 inlet manifold id need to use the st170 injector rail and i just prefer the look of it

De4n0

Hey guys, another question, I'm not sure if the fuel pressure regulator on the st170 injector rail is worth keeping or getting an aftermarket adjustable kit with a gauge, if I was to get one would I adapt to fit it in the middle of the rail were the standard one is or on the return side of the rail? Thanks, dean.