sounds more like a bad regulator than a bad fuel pump. If a pump could only handle 30psi at idle, it wouldnt hold shit under boost.

 

also, i dunno if the fuel pumps on those newer sentras are controlled via ECU or not (since they are originally returnless right?)

but alot of us 240 guys wire in a relay with the fuel pumps to help maintain a constant voltage at it, a few guys long ago had problems with walbros not getting voltage at high rpm's causing the pressure drop and the lean condition.

 

In my experience I have seen widebands act crazy right before the sensor goes. How long have you had the wideband installed on the car? Do you run it all the time. Does it need to be calibrated? Is it the wideband on the dyno? Did they change the filter on the pump before you started making pulls? Just a few things to check..

 

Well, i've had this walbro pump since i had the stock qr with the turbo kit installed....a good 2 and a half to 3 years ago......I've been running a jwt ecu for as long as i've had this sr which is about a year and a little bit....i've been making 430whp at 20psi on it. I decided to go with aem and all of this starts popping up. I guess there's no other choice but to start the fucking process of elimination. Im gonna have to clean the fuel filter, change pump, change fuel lines, change fpr and if this shit keeps up change my damn job cuz im gonna end up broke as hell with no money to feed my daughter....Its always 3 steps back before going 1 step forward with this fucking sentra.....worst of all is i have no time to do shit......damn.....lets see i guess..heh...........

 

if ya need help with anything nordy just lmk...

 

hey thanx kevin...

 

yea +1 if you need any help taking the aem off so we can put it on my car lmk. hahhaha j/k call me I should be at XAT working on my OS Giken this week hopefully they get the wideband on the dyno fixed too.

 

no problem bro....anytime...

 

So, today im driving down dale mabry and all of the sudden the car starts acting up and it felt like i was hitting a wall when i would press the gas pedal. It turned off on me and i coasted to the rent a wheel next to bennigans after the stadium. I would turn the ignition on and would not hear the pump prime so i called martin from xat and he got me another walbro pump that they had there and i threw it on. The fpr gauge would read pressure so there was pressure in the fuel rail. I switched the pump cuz i couldnt hear it prime when it used to be loud before. So after i try and start again with the new pump i still dont hear it prime but it gets pressure. I attempt to start again and my buddy "alpha" connected his lap top, logged on to aem and we noticed it was reading 30psi of load and 100% throttle. I went and wiggled the map sensor and it started reading what its supposed to read. So it seems that the whole thing was due to the map sensor. Now, is the map sensor messed up or is it a connection/wiring issue? This is my next pain in the ass.....figuring out if the damn map sensor works or not.......awesome.....

 

Call me i can help you trust me! (813-390-4703) Glenn