how do u have ur pumps wired be specific

 

One of my pumps is wired as the stock fuel pump. My second pump gets power from a hobs switch that sense 4psi of boost in my intake.

 

Why not run one big pump?? Just a ???

 

I run the same setup except the 2nd pump kicks in at 2 lbs of boost.

 

I never have understood why people wanna run 2 or 3 pumps.

 

That's mine too but the feed wire is 10 ga battery power from a relay ignition on power.

 

Imo 10G wire is over kill for the 255 pumps.. There is no way it will fry a wire. It will pop a fuse before anything happens.. Just saying.. If you feel safe doing a 10g wire awsome..

 

It doesn't take any more effort to make that a 10 ga vs 12. Low voltage to any electric motor ( and a fuel pump is an electric motor) will shorten it's life and hurt performance.
It's like running a bigger fuel line than you need , you may never know that it's too big but you will def find out that it's too small when something goes wrong.

 

yeah mangled, think of electric wire as a pipe for fluid. It's not that the 12 wire will burn up, it just that you may run into resistance for the flow or amp draw (but not enough resistance to burn it up). As Raffman says, volt loss (due to resistance in wire) will shorten the life of your pump if the volts are outside of the manufacturer's specs. As far amps, 12 wire is good for 20Amps (10 wire is good for 30amps). But again, it's all about voltage drop in our setups...

18AWG has .00795 resistance per foot.
16AWG has .00499 resistance per foot.
14AWG has .00314 resistance per foot.
12AWG has .00198 resistance per foot.
10AWG has .00124 resistance per foot.

Look at the jump from 14 gauge wire to 12 gauge.

@ 13.5Volts at 60psi most 255 lph pumps draw ~10.8amps.

This means at ~13' of 12 gauge wire you'll have 12.96 volts supplied to the pump (starting with 13.5Volts). To get 12.96 volts with 10 gauge wire it would be at ~20' of wire. Or more importantly, the 10 gauge wire at 10' is 13.23 volts. The 10 gauge wire is important for the pumps as it will help determine the ease for the pump to get the pressure you want. It doesn't have to work as hard.

What's the real length of wire? You could argue that we only use half that much and that means the pump is getting proper voltage. Test the voltage at your alternator + with a digital meter and then check it at the pump. Is that loss of volt acceptable?

 

cuz 1 of my pumps is wired with the stock relay and the other is too an aftermarket relay hook the switch on the a relay to the ign , is this ok or is 1 pump gonna have power than the other well that is wat my friend is saying