Hi
I did a b16a1 motor what all stock in a 1991 civic hb dx. Since the day i did the swap Code 43 comes up But it switdhes from that code to code 44 they both are fuel supply. I don't have a clue on what it is and i live in germany and there is nobody that knows any thing. thanks

 

That's weird. Code 43 is fuel supply system. I don't find code 44.
You need to find out what triggers code 43.
I would begin by replacing the O2 sensor, that is the only way the ECU knows what the fuel supply is doing. There are no sensors in the fuel lines. As far as I know the pump is not monitored by the ECU, but do replace the O2 sensor. It's cheap and you might need to do it anyways.
Also, it could be a malfunctioning pump. It could be making the mixture fluctuate from rich to lean.

 

i have changed the 02 senors once and it still does it but they were used o2 sensors were can i find new o2 senors for cheap becuase over here they are 200 a peice. Also what fuel pump should i try.

 

Well, here in the states you can get the Bosh one wire O2 sensor for $20 or so.
I think Bosh should be available in Europe as well.
About the pump, I would stick with OEM. Get one from a junk yard. Find a newer year honda Civic or integra and use that one to replace yours.

 

Okay i got new o2 senors in and the codes are still coming up but both codes come and stay on. what else could it be.