Electric fuel pump choice

Coupe is not a Model as far as I know. What model is this?

It is in middle east market.in USA and probably Europe it is a Tiburon.

The spec for fuel pump pressure is 49.8 psi and that converts to 3.43 bar. You need the 3.5 bar then.

Thank you. I have a problem with my car. When my fuel tank is full car performance and acceleration is good but when it reach near half tank and below that performance and acceleration decrease. what can cause this? I don't have any problem with cold starting or idling or anything else. Fuel filter is new. Can it bee the pump or the regulator?

I don't know why the fuel pressure would change just because it's down to half a tank, but when this problem occurs if you crack the gas cap loose just a little can you hear and pressure or vacuum escape and does the engine run any better after loosening the cap? If so, it sounds like the cap vent is bad, change the cap if this is the case.
Other than that I suggest you stop by an AutoZone or Advance Auto and have the engine trouble codes retrieved from the engine computer module and if it's not obvious and they sell you a part, post them codes back in here and I'll help you troubleshoot the codes.
You can still check the fuel pressure if you have a fuel pressure tester.

Unfortunately i check for trouble codes several times and nothing. when i open gas cap i hear i pressure sound but in car manual says it is normal. can a gas cap go bad without engine trouble code?

A lot of things can go bad without setting an engine code.
Does it run any better after loosening that cap?
Did you check the fuel pressure?

I will check them as soon as possible and let you know.

Okay.

I find very strange problem today. car runs bad i mean acceleration and performance was not as good as it should be. But after an hour start the car and its perfect. between this i plug out the fuel pump connection and plug it in again. I am very confused about this.

That could have well just been it, a loose connection.

I check for voltage drop on positive and ground side of pump. Its about /2 or /3volt. Could it really a bad connection?

Why did you insert a / before the 2 and 3?
the voltage drop should be almost 0. More like 0.1 volt.

Ground side was
0.2
Positive side was
0.4
Is it bad?
If yes so what to do next? How i can fix this

No, that is ok.

Could this problem is maf or tps? Or o2 sensor? As it come and goes randomly there is no chance for mechanical problem am i right?

I thought you said after messing with the fuel pump connection it fixed it?

Yes i start the car and it did good but next time when i shut off engine and again turn it on it did bad.

Wiggle the same connection again or do whatever it was that you did before and if it fixes it again, inspect what is wrong, perhaps the connections have backed out of the plug, any corroded wires and/or if the harness is got broken wire strands under the insulation. If that is the case on the harness, that is going to be hard to find and it might just be better to replace the wire harness.

One mor thing is my car computer show how much miles can i go whith this fuel level. When i pull connection out and then plug it in the numbers of miles increased and after that car runs good.if it can help i pull connection out when key was in on position and plug it in when take out key. I want to mentioned one more thing i fell when ever i fulling my gas tank car runs great but when it comes down on fuel level it run bad again

When I asked you if the engine runs better when loosening the gas cap, I don't see where you answered that?

No it doesn't change at all. I have a question is a electric fuel pump flow and pressure change with engine rpm? Or it has a stable flow and pressure no matter low or high rpm?

The fuel pressure is determined by the fuel pressure regulator. If the regulator is on the engine at a fuel rail, etc and has a vacuum hose to it, changes in intake manifold vacuum from changes in engine rpm will cause a slight change in pressure but I believe the flow will remain the same.