hard wirering fuel pump

[gotgrip666]

is hard wirering the fuel pump just as easy as power ground the a wire to a fuse relay that starts with car and runs all the time?

 

[hediki12]

explaine what you mean by hard wire?are you talkin about rewiring?

 

[hediki12]

ok i think i get ### you mean now i honestly dont now if that will work seeing that the flow of the fuel pump is regulated by voltage. so how will the volt be regulated if it it just hard wired independently to a power source? i would like to see if anyone has done this and how it works..

 

[allthrottle]

I've done it on Honda's and other older cars/muscle cars, not the dsm yet. The ecu on older cars doesn't usually send variable voltage to regulate fuel pump pressure. It usually only needs battery voltage and ground to pump fuel. The fuel pump re-wire mod for dsms is giving the pump constant power from the battery (with a relay in-line) and ground. It uses the original pump power wire for a signal to the relay only. In reality, you could use any switched 12v source as the relay signal.

The regulator on the rail is what regulates fuel pressure. In some newer cars with returnless fuel systems, the regulator is built into the pump, and the ecu can vary voltage to regulate fuel pressure.

 

[blazinglaser_90]

mine is wired to a switch.

It has constant ground and gets a switched 12 volts through a relay works fine and dandy esp with an aftermarket ecu

or you can wire it up so that you have a ground that kicks on the relay either way it works, using the ground method u can also retain the stock ecu kicking the pump on when it see's an RPM signal or most aftermarket ecu's have this ability to ground out upon syncing of the cam / crank signal on our cars

 

[gotgrip666]

thanks guys im only doing this because it wont run thru the wirering harness so i figure i will just wire it to a toggle or a fuse thanks guy