Direct power to fuel pump?
Direct power to fuel pump?
Searched a little, didn't find much. I want to run a direct current line to my fuel pump, (also relay and seperate switch) to ensure constant pump voltages under high boost. Anybody ever tried?
Joined: Sep 2003
Posts: 3,067
Likes: 7
From: Home of the Rolex 24
Good choice.... I have been running the set-up for some time. My battery is relocated to the rear bin. I have the switch mounted in the bin also. Also adds as a security feature. You need to run the relay and switch into the 12v of the pump. I ran the ground to the back frame. I would have to look at it to give your more specifics. Make sure you connect all the wires securely! I soldered everything to be extra careful. Good luck G..
Originally Posted by PDViper77
I did the same thing ^^^ but without the switch. Thats how my 2 FPs are wired up.
I've seen few in the past and can't find them.
Thanks!
Originally Posted by G's 3rd Gen
Good choice.... I have been running the set-up for some time. My battery is relocated to the rear bin. I have the switch mounted in the bin also. Also adds as a security feature. You need to run the relay and switch into the 12v of the pump. I ran the ground to the back frame. I would have to look at it to give your more specifics. Make sure you connect all the wires securely! I soldered everything to be extra careful. Good luck G..
Good stuff fellas, appreciate it very much. I plotted out a diagram and all that good stuff, however I "JUST" wanted to make sure I wasn't missing any points from some expereince.
PICS of all this fun stuff soon to come.
Originally Posted by mad_7tist
just use the stock wiring for the stock pump to activate the relay. running seperate power wires for the pump obviously.
Thanks for the help guys.
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here are a few quotes I picked up..
Originally Posted by Chuck Westbrook
Note that the stock wiring suffers from voltage drop which limits capacity of stock or aftermarket pumps. Re-wiring the pump with heavy gage wire for full battery voltage will provide a huge improvement in fuel delivery. This trick to up the voltage can be taken to the extreme with aftermarket boost-a-pump electronics that further increase voltage under boost.
Originally Posted by Boostn7
Run a thick gauge wire (10 gauge) to the pump from the battery fused. Have it power up thru a relay which gets its turn signal signal from the "speed relay" white/red wire. The fuel pump "speed" relay is in the relay box near the fans and latch. This white/red wire only comes on with load or 0psi +.
Therefore @ idle and cruising pump will only see ~9 volts and then battery voltage when under boost:-)
Do not use boost-a-pump with higher voltage on those Supra pumps....they will not last !!!
Therefore @ idle and cruising pump will only see ~9 volts and then battery voltage when under boost:-)
Do not use boost-a-pump with higher voltage on those Supra pumps....they will not last !!!
Joined: Sep 2005
Posts: 25,581
Likes: 136
From: Smiths Falls.(near Ottawa!.Mapquest IT!)
just wonderin
if you wire up direct,and even if you are using a relay ...if by any chance something goes wonky with the car..I hate to say ..you have an accident or a similar scenario..is the fuel system still going to be powered up?..if it has no cut off ..you get where I'm goin on this...(woof)
Joined: Sep 2003
Posts: 3,067
Likes: 7
From: Home of the Rolex 24
Originally Posted by misterstyx69
if you wire up direct,and even if you are using a relay ...if by any chance something goes wonky with the car..I hate to say ..you have an accident or a similar scenario..is the fuel system still going to be powered up?..if it has no cut off ..you get where I'm goin on this...(woof)
Im not to sure how the PFC work exactly but im assuming it just ground the pump tigger wire which in turn shuts the circut open and fuel pump relay.
Im not to sure why you would want to change this, the power is coming strait out of your battary to the FP fuse - > circuit open relay -> fuel pump relay -> pump.
the only thing that might help would be changing out the rather small power wires to and from the different relays.
If im not getting what you mean please explain more
Im not to sure why you would want to change this, the power is coming strait out of your battary to the FP fuse - > circuit open relay -> fuel pump relay -> pump.
the only thing that might help would be changing out the rather small power wires to and from the different relays.
If im not getting what you mean please explain more
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