Ok so im in the middle of my build and have been trying to figure out the wiring for my dual pump setup forever. Seems most people run a pressure switch or trigger with aem which is fine but I want to run both pumps all the time and couldnt find anything very descriptive on doing it specifically for the evo. I made a diagram of what i have been able to figure out and would like some input..



let me know if anything needs changed.

 

Bump for needing some input..anyone?

 

FYI - running both pumps all the time will cause the FPR to get over run at idle. This will cause your fuel pressure to increase uncontrollably at idle and the car will run like poo.

 

Negative ghost rider. That problem is fixed by drilling the siphon with a 9/64 drill bit. Ted B. Covered this in another thread. His pumps both run all the time.

I'm in no way debating wether to run a pressure switch. I'm running both pumps 100% of the time...just need to make sure my wiring is correct. Thanks anyway though.

 

Ummm.... the 9/64 drill bit did not work for me - I could not get the fuel pressure at idle low enough with both pumps going. The stock system runs the first pump lower at idle also - don't F with that, just add the 2nd pump at full power off an additional relay with new wiring, both negative and positive leads.

Best of luck - i could not get both pumps to run at idle and I tried lots of stuff (wasted lots of money). Search for threads by me I started some about it.

 

what do you mean where you said "the stock system runs the first pump lower at idle- dont F with that, just add the 2nd pump at full power off an additional relay with new wiring, both negative and positive leads"?

I plan on running the setup with 2 relays, 1 for each pump. Theres not much of stock setup left. Im running aem, aeromotive fpr, fullblown dual pump setup. The only thing i really plan on using even off the stock pump harness is trigger.

 

The stock system uses a MASSIVE resistor to drop the voltage of the pump at idle - this is helpful for idle fuel pressure. Your best bet of getting the two pumps running at idle is to have the first pump running off the stock system which will run at a low idle voltage and create less fuel pressure. The 2nd pump will need to run at full voltage unless you also use a resistor and switch to the 2nd pump to make it behave like the factory system - thus both pumps running on low voltage at idle and then switching to full voltage under cruise load.

If you run both pumps at full voltage at idle you are going to need a BIG hole in the return siphon for sure. At least that was my experience. Which system are you using?

 

My fuel system from start to finish is 2 intank walbros in a fullblown hanger with the wiring done like my diagram above. running -6 an line to a magnus fuel rail with ID2000's(no resistor pack) Tuning will be done with AEM.

 

bump

 

In order for this to work you will need an aftermarket adjustable FPR. Without it you will have excessive fuel pressure at idle. Ted's mod is indeed needed but it is only part of the solution.

In regards to wiring it up, Use a couple of relays for each pump. Trigger the relays with the factory 12v wire that powers the stock pump. Run two 10ga wires from the battery to each relay for pump power. You can ground the relays to the chassis, but we found that actually grounding the pumps at the battery will give you a .5v bump in output. Ground wires should be as large as the power wires.

 

Drifto: I do have a aeromotive FPR, so im good there. As far as the way you are saying to wire it, could you make a diagram similar to the one i made so i can see better what your talking about?

 

Your diagram will work but if you ground the pumps at the battery you will gain voltage which increases pump output. Or you can do it as described in post #5 which is a much more simple way of netting the same result - Two pumps running at once. What jid2 is talking about is wire one pump (we'll call this #1) directly to the stock wiring. Power to power, and ground to ground. This way one pump(#1) will work as the factory intended with lower voltage until needed. Then run a jumper from the factory 12v wire you are powering the #1 pump with to trigger a relay and use the wiring schematic you already made for the other pump(pump#2). Ground #2 pump at the battery for more voltage.

 

So question.. I have the full bl

 

I have the full blown double pumper in my Evo 9 but my stock trigger wire isn't working for some reason I have Aem v1 standalone how can I wire the trigger into the ecu ? Any ideas?