Fuel Issue

[blv]

hi guys,

ive got an S13 with an RB20DET in it, and its got a fuel issue of some sort.

heres the mods.

RB20det manual with:

RB25 turbo

Twin dump

3" dump back exhaust

600x300x76 FMIC

Bosch 040 intank pump

now i used to have an XR6 turbo pump in there, and i could run 16psi no problem. it went fairly hard too. but it died last week and i put a bosch 040 intank pump in. i also went through a water temp sensor issue too, but that all fixed and the car is running sweet, except if a go above 9psi, it leans off. if i set the boost controller to 8psi, car runs perfect all teh way to 8000rpm till it hits the limiter. but anymore than this, and it leans off around 6000-7000 rpm and starts to pop and stutter. and i get off it, cuase i dont wanna blow it up....

so whats the deal? i think maybe the fuel reg is fooked, but i dont wanna buy a new one if this is not my problem. i also have a new fuel filter in there too...

thanks in advance

[GeeTR]

Hey there,

Are you sure its leaning out? I would stick a fuel pressure gauge on a T piece and check base pressure, and that its indeedally dropping up top.

Cheers

[R31Nismoid]

Ye, as above.

Check the fuel pressure.

Will either be the pump of the reg not working

[blv]

ok, i'll rip the fuel pressure guage off my other car and check it.