On saturday i went to Bilal gunj lahore with my mechanic to have the return valve checked and changed. Before that i checked 2 of the Suzuki 3S dealers and another main dealer at Montgomery road for a new one but all of them told that this part does not come. then we search for the return valve at the market. from one of the shops, we found them, which were detached from the japanese model. We took two for checking. the car was with us. we changed the return valve. from first change the car became 80-85% ok. a little bit of missing still felt. then we replace the valve with the second one. the car became 85-90% ok. after thorough check up. this was the best result we have attained. again a bit confused, we replaced the valve with the original one which was detached from the car. the car went to about 70%. the second one gave us the best performance so we settled with the second one. purchased it for Rs. 500 and came back.
now the car feels like 90% ok on petrol. the problem left is that it first dips on initial accelerator and then attain normal pickup.
please suggest what could else be the problem. is it the fuel pump or something else? my mechanic is saying that we now have to change the fuel pump.