well i recently bought a 92 civic with b16a2 swap off a friend and ever since hes had the car it just ate fuel like it was its business. i get terrifying fuel mileage! my friends 350whp civic gets better. this one i have right now `170whp n/a, shaved head, port/polish, stage1 cams, itr valvetrain + more.

Ok now that you have the background, i know the car is running crazy rich because 1. my fuel disappears (im not leaking) and 2 the back of the car gets covered in black in record time ( like 2 days!) and its not oil. the car has a walbro 255 fuel pump and no aftermarket fuel pressure regulator (don't know why).

So is this most likely due to the pump since since no regulator or could it be due to the injectors being stuck open(if thats possible). or any other ideas?

Out of curiosity too what is stock fuel pressure for these cars?

 

upstream O2S may be not working.. or you need to get a aftermarket fuel regulator to let off the pressure of the gas, pump maybe too atrong, or you got a leaky injector. do to kragen and buy a pressure guage to measure your fuel. check if it drops after the pump has shut off in the on position

 

y not just get the car tuned???

 

21mpg im sure is due to something else than a tune. once i have this problem fixed i will have the car retuned.