I have a spectra premium sp1205mp and i can't figure out which line goes where cause they both 3/8. For some reason most mechanical fuel pumps picture i see is upside down.

 

Welcome to the site..

Since yours isn't pictured (?),, just hold the pump firm and use the cam lever to simulate cam/arm travel. One hose fitting will be 'suction' inlet felt with a finger against the fitting,, the other fitting may tend to 'bark' as air moves on through and is the outlet to carb..
You can also install a short fuel line on either fitting and test the pump in the same way, only with a small container of fuel. One side will pick up fuel (inlet) and push it on through,, the other will blow bubbles (outlet)

 

I have it on the engine but to be sure, was hoping someone knew this style. Might end up having to take it back off, but to save a lil time was hoping someone knew which was which so i can just swap the hoses.

 

When looking at the pump,, fuel enters and if filtered on the larger diameter or OD of the portion of the filter canister, fuel passes through the filter and exits in the smaller or center core of the filter.
So the inlet S/B on the fitting within the column, and outlet on gooseneck fitting at the assembly center..

When a pump is mounted and unsure, have a helper crank the engine over and it's easy to determine inlet/suction against a placed finger...

 

Ok i verified it. The curled is the outlet. Also, when i put the outlet on my carburetor, seem like no matter how tight i tighten the worm gear on the rubber hose on my carburetor inlet, it leaks like a busted water hose. Why? The pump is rated for max 6.5 psi if im not mistaken. Not sure which is wrong. The pump or the carburetor.

 

What carb? Stock, aftermarket?

Generally the carb fittings were 5/16 hose,,
Do you have a steel fuel line that runs from the 3/8 pump fitting on up and reduces the line size? Fitting on the carb is sealed/tight?
If you ran 3/8 fuel hose all the way up, and the carb fitting is 5/16 usually a worm drive clamp will pull it down enough and seal, but always good to have matching sizes to stay put. Especially if it's a large leak, should be fairly apparent as to the cause..

If you can post up an image or two of the leak area, may be better so we can see as well...