Thread: designated relay for fuel pump

I have been searching and theres not alot to be found concerning this.
I understand the basics of it and relays,etc.
But I am looking at ideas on how to do this most reliably,cleanly and simple.

Show me what ya got

This was pretty common in the Mitsubishi scene. Its basically supplying battery voltage to the pump. Meaning the fuel pump will get unmetered voltage therefore increasing fuel pressure.

I'll draw up a schematic for you in a bit. Super easy to do.

Check this out.
http://www.enginebasics.com/Advanced%20Engine%20Tuning/Images/Fuel%20Pump%20Relay.gif

85 - factory fuel pump positive signal
86 - ground
87 - fuel pump positive output
30 - 14-12 AWG positive wire to the battery

I did this years ago.

is this necessary with Walbro fuel pumps as well?

Necessary? No. Useful? Yes.

My AFRs changed a lot when i upgraded the wiring. I would say it should be done on any car with mods to make sure you are getting good voltage to the pump.

Would you think its necessary On a stock det swap with 370s stock maf n walboro pump?or any boosted application

Thanks that was what I did
Turned out great...heres some pics and details of the install.
I will do this to any/every time from now on.Even on a stock pump,I would bet it makes a difference.

http://www.sr20-forum.com/sentra-se-r/39341-what-did-you-do-your-b13-today-90.html#post1012718

As always Jay, excellent work!