I did a stock rebuild on a b18b (crv head). With a stock fpr it ran lean. So I used a B&M fpr, adjusted it say 5psi higher than stock (hose disconnected) and it still ran lean. Now my fuel pressure is at 56 with hose off. It is much better but it still runs lean at 2k-3.7krpm in 4th/5th gear. Barely does it in 3rd under those conditions. Unfortunately I am running a autometer a/f gauge but when it was showing no bars it hesitated/missed until it got out of the lean stage. I wanted to know if it is safe to run this pressure until I try other things. Plugs (other than white) are fine; gapped properly to 1.1mm and timing is set stock.

Ive had this lean problem even when I was playing with my old d-series mini-me. I decided to get the b&m fpr and gauge just incase I needed it. Maybe the gauge is faulty. The problem I had was it ran lean under most load conditions in 2nd-5th gear and sometimes lean enough to wear it would show a CEL. The o2 sensor (univeral bosch) was also replaced with a new unit (same cheap ****) when I did the b swap.

Until I can get some more time to play with things I was gonna replace my fuel return line since it got a little messed up with the oem clip. THen try out a spare MAP sensor and also try different injectors. THe current ones are the ones I had in the d-series motor so they are old and maybe the could be somewhat clogged.

Any advice would be great but really I just need the answer on my fuel pressure: is 47/57 too high?

 

anyone

 

if your using the autometer air/fuel guauge, i think the o2 sensor is bad if they reading is lean, becuase 56 psi with the hose off is very rich

 

that bitch was replaced. currently it only has around 3000 miles on it but I was lean with it being brand new (stock fuel pressure then). so i dont think it is that...it is only under certain conditions (although not normal) that it reads lean