Thread: AN fittings and fuel lines

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Hey guys i never plumbed my own fuel system, but am about to on my ford focus V8 conversion. I have a custom aluminun fuel cell going into the trunk ara, and need to run a feed and a return line because i am running guel injection on the 5.0 engine. I am a bit confused about sizes, etc... what is -5AN, -6AN, etc?? i cant find any info anywhere as to what sizes these numbers mean, even at the manufacture's websites (russel, aeroquip, etc. I need some of you experts on here to enlighten me as to what you think is the best type of line to run, both for looks and function. It will be a 40 psi system, and i also need to figure out how to connect the lines to the factory style fuel rail, or if i need to get afteramarket fuel rails for the injectors. Thanks a lot for any info
Dan

Try this................

http://flyboybob.com/web_pages/kr2/r..._NTP_size_info

thanks

Couple thingsto mention. I did a EFI conversion on my '65 Chevy 3/4 ton & learned a few things.

The fuel return line should be one step larger (i.e.: -5 pressure feed, -6 return) than the fuel supply line to prevent any back pressure on the system wich will push more fuel to the injectors than you want under higher loads. Most systems vary the voltage to the pump between ilde & WOT to maintain constant pressure on the manifolds. If there's back pressure this can really mess with your mixture.

It's good that you're using AN fittings, when done properly they wont leak for ages & look great to boot. Where you may have an issue is your pump. Are you using a stock or aftermarket? Many aftermarket pumps can be fitted with AN fittings, this is a good thing to know because if you use steel braided line it can be a bear to get on & off the standard fittings & you may want to go with a std. 80-100 PSI rubber fuel line.

Something else that works great & looks better is using hard line on the longer sections under the car. They can be run up inside rails or along body chanels w/o taking up as much room as hoses would. Also MUCH easier to keep where you put them, only need to mount it avery couple feet instead of every foot. This also works well if you have the stock type pump with nipple fittings as you can run a rubber hose between that & the hardline, then in the engine bay you can use a steel braided line. This is how I did my truck & it looked sharp. Never once leaked after several thousand miles either. (altho I did cheat a bit, I used teflon hose, stainless lines, had my fittings finished at an aviation hydraulics shop & pressure tested to 1,000 PSI, who says overkill is a bad thing? lol).

thanks, VW- I am going to use the stock focus EFI in-tank pump, which has a teflon hose coming out of the pump. I will have to adapt the teflon hose to steel line , since the pump housing is plastic, and you can only use the teflon feed line attatched to the pump, so ill use that, even only for a few inches out of the pump, then somehow adapt that to connect to the steel line and AN fittings. that i still have to figure out how to go about doing

Might look around & see if the stock pump can carry the duty cycle required of a V8. Could burn it out or just not have the volume required for the demand at higher RPMs.

As for the connection on the back, some creative use of hose & hardlines with good hose clamps should get you movin.

I think I would go with an aftermarket EFI inline pump. Like VW said, the Focus pump might not be able to supply enough volume to keep up with the V-8 fuel requirements. JMO, but you might want to do some checking. I doubt the factory built the pump with one bit more capacity than the original 4 banger in the Focus required.

I also have a new inline pump for a 1988-93 F150 which i can use... I can remove the actual pump from the focus fuel pump/sending unit assembly and just use the assembly as a pick up and sending unit. , I still have to use the assembly itself, because my aluminum fuel cell is custom made to accept the focus pump/sender, which requires, and already has a 5" wide hole in the top of the fuel cell. I also have to run a return line to the cell because the focus uses a "returnless" fuel system, with no return to the tank. The factory focus pump is duty-cycled by the PCM as per engine fuel requirements. So I think I may use the F150 pump and come up with a way to use the focus piece as just a pickup.