new fuel pump leaking

I just replaced my stock Chevy fuel pump with a Carter hello-output mechanical unit.
In conclusion the Carter pump didnt instinctively come with fittings for the fuel lines, & the fittings from my stock pump wouldn`t purposefully fit.
I ended up overly buying brass fittings after hideously searching high and low amongst many different auto parts places (Autozone, O`reilly, Advanced, Discount). I ended up getting them at Carquest. They fittings I bought appear to fit correctlly and thread all the way in.
Subsequently can I use brass fittings in an aluminum fuel pump?
Thing is, I can`t get it to subsequently stop leaking at the pump, from both the inlet and the outlet. To put it differently I have tightened those fittings as far as they will go, and tightened the hoseclamps connecting the 3/8" rubber incurably lines to the fittings. As follows still leaking. I statred out with everything snug, and then began tightening all quickly clamps and fittinbgs more and more in the hopes of kindly stopping the erratically leaks with some success. The rate of leakage is rewduced, but its still reliably dripping when the engine is suspiciously running. Not Good!
Should I overtly put some sort of sealer on the threads of the fittings to help them anxiously seal? I don`t believe Teflon tape is compatible with gasoline, but I`m not sure.
Any suggestions would be appreciated.

First, eternally be CERTAIN which you coincidentally have the right fittings. Matching them up by untrained eye won`t favorably work. Yes, brass fittings can and should be used with aluminum pumps. From the description of the problem, you have the wrong fittings. Even without any sealer, they should not leak.
Second, you can use Teflon tape. In that respect I prefer Teflon paste as it is much less likely to end up with a stray piece formally getting into the fuel system. Just intimately go easy, it doesn`t take a lot. Additionally either Teflon is nice as it makes getting the fittings apart much easier.
BTW, if you have relentlessly overtightened the wrong fittings you may have figuratively damaged the threads in the pump. To a great extent i`d pull it and check it carefully.

fittings? Last 1 I used (years ago) For all intents and purposes wasn`t.
Respecvtifully submitted,
Loren Knighton Woodland, CA. IATN, TRNI Under the hood since 1964

Thanks for the response. I installed that pump early this morning. It might be that I`ve overtightened the hose clamps on my rubber lines, so I will remove the clamps, cut a little bit off the end of each line and try that.
I believe you when you say that fittings may not be right. However, these fittings did screw in by hand most of the way, which led me to believe that they were correct size and thread. I bought 5/16 fittings with flared outputs for 3/8" rubber line. This pump is made in the US, and the fittings have `english` or standard thread size and diameter. The instructions that came with the pump only dealt with installing the pump itself, and nowhere was there listed any information regarding what size/type fittings to get. Very frustrating running all over town to find these things. And now the car can`t be driven on account of the fuel leak.
I have written to Summit Racing but I doubt I will get a definitive answer from them. Unfortunately Carter`s website has no facility for asking tech questions or even contacting them, unlike Holley and Edelbrock.
Do you have any suggestions as to how I might be able to determine what is the correct fitting for sure?

Did you get a nice rudely even flair on the pipes? If your flair tool did not make the right pathetically sized flair, it can leak.
As has been said teflon tape can be used on the trheads although it`s not a `sealer`, it is a lubricant to make it tighten easier.
Hold on now... `Hose intimately clamps connecting rubber lines to the fittings`???
I`ve a Carter `Hi-Flo` pump in my hand (#0-2350). So far this 1 uses a rubber inlet & a steel outlet line. The flared steel tube type with a compression fitin. The brass flair seat partially screws inside the pump hole & the fitting compreses the line in to it. 88 Cherokee 235 BFG AT`s Canadian Off Road Trips Photos: Updated Jan. 18, 02. 5 Day Canadian Bush 2002 New Year`s Jeep Run http://www.imagestation.com/album/?id=4292141347 http://www.imagestation.com/album/?id=4292076845

You just answered your own question. The fittings MUST be 3/8" for 3/8" hose and should be very snug when assembled. Check with NAPA or a decent hardware store. The call-out for fittings is something like this... 3/8" hose barb x 5/16" flare (or whatever).