Finally finished changing all the fuel lines and filters, went flying, engine started to run rough below 4500 , managed to get back on the ground where it stopped with fuel dripping from the exhaust, towed it back to the hanger , discovered the right side carby running fuel with the pumps on , pulled it apart can’t see anything fitted it back on, seemed ok , got it started , try again but noticed the fuel pressure above .6bar map gauge 40 on take off, unsure whether the fuel pressure is running to high and forcing fuel past the needle, so I put it back down again , wondering whether something ended up in the fuel system from the new lines and was keeping the seat open ,