Fuel System: New to AN. (Help!)

[go-fish]

Here's the situation, I have an Aeromotive A1000 pump that has a -10 inlet and outlet. It seems to me that -10 is 5/8" i.d.? Is this right?
I was thinking I would do 1/2 fuel lines but if I get the -10 fuel line to go with the fittings, wouldn't they be around 5/8"? And is that too big, should I get fittings that reduce the -10 to a -8 and run -8 line?

Two things that are confusing me on this fuel system are whether or not I should go with the -10 or -8 sized fuel line and what size filters to run (100 before pump and 10 micron after?)


Thanks fo ay help.
-John

[Vegas69]

How much horsepower? 100 micron pre pump and 10 micron after is fine. I ran 10 an to the pump and 8 an to the regulator and an 8an return line. I am only at 600 ponies though. If in doubt run the bigger line. You can easily adapt from 10 an to 8 an on the outlet side of the pump if you decide to do that.

[1969CamaroRS]

I'd stick as close to the manufacturer's recommendation as possible. They know their flow rates. Too small a feed and the pump will cavitate; too small a return and the idle pressure will be too high. Going larger doesn't really help much and just costs a lot more and is harder to fit.

[camcojb]

I generally use #10 from tank to the pump inlet with a 100 micron filter inline, then #8 out of the pump with the 10 micron filter inline. I've made a lot of power with #8 lines from the pump to the rails, but it would not hurt to run bigger. I always try to keep the larger #10 inlet to the pump though, they do not like a restriction there.

Jody

[go-fish]

So I will do the -10 from the tank all the way to the regulator. I think I'm going to get an Aeromotive fuel pump controller too, I heard otherwise the A1000 will run full power all the time.

The inlet to the reg is -10 and the outlet of the pump is -10 so I might as well get -10 filters and do it all in-10.

Now, how do I get the -8 return back into the tank when there is no fitting or port available at the tank. Is there a type fitting that can thread into the tank? I have a brand new tank that hasn't ever been filledwith fuel so I could weld a bung on it as a last resort.

[Vegas69]

You best bet is to weld a bung in the tank. If you run 10an feed you need 10an return. I guarantee aeromotive will tell you the same. Which means you need a 1/2npt bung in your tank. If you plan to run 8an after the regulator why run 10an to the regulator?

[go-fish]

Because the return port on the regulator is -8. It is an Aeromotive reg. part #13204.

One more question, is there an optimal distance the pump should be away from the tank?

[1969CamaroRS]

You best bet is to weld a bung in the tank. If you run 10an feed you need 10an return. I guarantee aeromotive will tell you the same. Which means you need a 1/2npt bung in your tank. If you plan to run 8an after the regulator why run 10an to the regulator?

Isn't it common to run one line size larger to the fuel pump and then drop a size? Since electric fuel pumps are usually poor at pulling fuel but much better at pushing?

As far as distance from the tank to pump. I think you want it as close as possible given the above.

[Vegas69]

Because the return port on the regulator is -8. It is an Aeromotive reg. part #13204.

One more question, is there an optimal distance the pump should be away from the tank?

Then you may need a different regulator. As close as possible to the tank. Bigger feed to the pump than after is optimal.

[Karch]

You want the pump inlet to be flooded, such that it's not actually pulling fuel but fuel is flooding into it.

If you have a smaller outlet, then the flooded inlet should work well, provided the inlet is larger (to supply the required fuel).

[parsonsj]

To answer the original question, AN maps to tube OD. 10 AN is 5/8 OD tube, 8 AN is 1/2 OD tube, 6 AN is 3/8 OD tube. Most tubes used for automotive fluid have .035 walls, so the the nominal calculation for ID is

AN # / 16 - .070. So 10 AN is 10 / 16 - .070, resulting in an ID for 10 AN around .555.

As for applications, I use the "standard" sizes with my Aeromotive pump: 10 AN to the first filter and 10 AN on to the pump. Then 10 AN to the second filter where I step it down to 8 AN to go to the fuel rails. I use 6 AN for the return line.

jp

[SatisTraction]

for the best results make sure the pump is lower then the tank. that is hard to do but extra head pressure is always a good thing.

with 6an return lines you could see pressure creep at an idle. i would run #8 as a minimum. aeromotive has all the diagrams on their site. stick with them and you will be good to go.

one thing to remember is that the regulator has to be after the pump but it can be right after the pump and then a single line ran to the engine bay. reduces clutter and saves a little $$$ on materials.

[camcojb]

one thing to remember is that the regulator has to be after the pump but it can be right after the pump and then a single line ran to the engine bay. reduces clutter and saves a little $$$ on materials.

and prevents heating the tank up on long runs with the hot bypassed fuel and having pump issues................. ask me how I know.

Jody

[makoshark]

Hate to rob the thread and if anyone opposes then I`ll start a new one. I have a 67 camaro that I am installing an lt1 into. I`m using the stock tank for now with a walbro 255 external pump. I have one 3/8 stainless hard line and haven`t really been wanting to buy another one because they are expensive, but will have to do what I need to. How would I go about using an fittings, size, regulator, fuel filter. I like the idea of mounting the regulator by the tank and not running another fuel line to the engine bay, but how would that actually work in my case?

[Vegas69]

You will need a bung welded in your tank for return. You can cut your current fuel line and us AN to standard hard line adapters and AN hose.

[makoshark]

You will need a bung welded in your tank for return. You can cut your current fuel line and us AN to standard hard line adapters and AN hose.

Thanks for the reply, but that much I have already figured out. What I want to know is, do I use -6an fittings with the 3/8`s line. How do I do the return? I want to use an aftermarket regulator because I`m removing the factory reg system and having fittings welded to the fuel rails. They also come out to the drivers side and I need them on the passenger side.