jdmeg9

what is the factory fuel pump size on a 93 civic lx?

Jay_Sensing

Well, I searched all over HT and found two places where it was staed as being 79lph.

I was thinking 90 but either way, it's small.

Turbo_y8

yea it just small thats all you need to know

jdmeg9

thanks i tried searching but all i could find was crap. So that means when i drop this 190 in it will be almost 3 times the size. that kinda blows the whole fuel efficiency out the window huh?

EGmikeH22

no

your fuel pressure regulator will keep the pressure constant

you have a pressurized return system, the only time you need a new fuel pump is if the injectors are actually shooting more fuel than the pump can supply at that pressure, making the pressure go down, and the fuel flow into the cylinders go down.

Chances are you are flowing enough fuel from the stock pump, i KNOW a stock VX pump from 92 is able to push 230 WHP, so change it if you like, but save the money and buy gas.

jdmeg9

well it has about 200000 on the chassis and i am wanting to upgrade the boost and thought about upgrading the pump

T-RO

When i went boost I upgraded by getting a much cheaper 2000 Si pump which is 135lph

EGmikeH22

well **** if you've got that many miles, does anyone know when they sould be changed mileage-wise?

i'm just going to wait until my air/fuel is too lean up top, but im not worried.

jdmeg9

yeah i am not sure if the pump has ever been changed. but my A/F is still running good at idle it will drop to about the 2nd bar on lean on a non widband o2 gauge but as soon as i give it gas it goes to stoich full throttle is pretty rich because i am running the Jackson fmu as every one knows it is innaccurate as hell

jdmeg9

is it normal for it to lean out at idle?? mine has always done that, it is the only reason why i was thinking of changing out the pump.