Hey guys i need some help wiring my aeromotive pump i got it all mounted and lines hooked up just need to know what needs what.

Setup is on my drag car so the fan and the pump are on one switch on my dash and i also have a kill switch on the back of my car and the pump is going to run though that also so it can be killed if something happens but my ?? is do i need fuses/relay's or any other stuff and i know if i dont hook it up right i could have voltage drops at the pump and make for lower pressure and i dont want that. Thanks for reading i know i cant write lol

 

take the fan and the fuel pump off of the same switch. run them independently.

fuse and relay them.

i used my weldon with the stock fuel pump wiring powering a relay. BUT, since there is no check valve in the fuel system, the prime from the ecm for the stock fuel pump was not enough to build rail pressure to give the engine a priming shot. since them, i have run the pump on its own dedicated switch.

most of the 5 pin relays are all the same wiring wise. if you dont want a 5 pin (there are normally closed and normally open relays) get a normally open relay. when not energized, the relay is open (fuel pump not running)

that way, you take your switch, a low current 12v, to power the relay. then a 12v source (usually a dedicated power strip or the battery alone) to the relay, and the other side to the fuel pump.

http://www.autoshop101.com/forms/hweb2.pdf

hope that helps.

 

thanks man !! this helps alot. I have one more ?? why is a relay used? what do they do? how do they help ?? thanks again

 

You should beable to do a quick google search to answer that question. But the reason is because the fuel pump you are running will draw 10-20 amp depending on the pump and pressures you are running. Having a relay to trigger the 12v power too the pump will allow you too run a low current signal/trigger wire to turn on the pump. The last thing you want is a switch too burn up because of overheating.

You can either send 12v or ground through the relay to both trigger the relay and trigger the pump. I usually like using a ground trigger for a relay.

Run the wires to these terminals
Relay Triggers for relay
85- Run either a power or ground polarity doesnt matter
86- Run the opposite thru a switch to trigger the relay

High Current Side to pump(I suggest atleast 8ga. wire too the pump depending on length of the run)
30- Run a fused 12v supply to this terminal(go by manufacturer recommendation for size)
70- Run wire to power size of fuel pump

What this will do is when you put power and ground to the 85 and 86 terminals this will complete the circuit on the 30 and 70 terminals, sending power too the pump.


I would recommend putting the trigger for the pump and fan on different switches. There is no need to keep the fan running without the engine running while trying to start the car. The added load will put a drain on the battery and could cause hard starting issues between the pump and starter draw.

But if you want too keep it this way you can run the trigger from the switch to trigger 2 relays at the same time.

 

it uses a low current source to power a large current source. if you dont you need to run a fat wire to a switch that can handle the power, with a large fuse to the thing that you are controlling.

it takes the abuse away from the switch. makes it work a little easier.

 

Ok so its like a helper so you dont have to run big *** wire to run the pump and switch

 

basically yes.