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Help out of fuel with Fore Stage 4 Fuel System

kcc0521

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I just installed a FORE stage 4 fuel system with wiring on a 2015 GT with a whipple, 1050x injectors, E85 and 3.65 pulley. We initially ran the car on two pumps because we felt the third was overkill. At about 6800 STFT starting trending up and AFR went to 81-83. I have checked all the wiring and it appears to be good. We added the third pump and it got better but it still seems to be running out at the top of the gears. Where do you guys have your tripple pumps grounded and powered at? Another weird thing is the fuel pressure has changed three times after setting it. I set it with car running and vacuum line off at 55 then check it a bit later and it is showing 51ish.
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bluebeastsrt

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Bad regulator?
 

bluebeastsrt

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I don't know what regulator your kit uses. But my kit came with a holley. It also came with two springs. Of course the installer put in the wrong spring in the regulator. So we had issues til I called lethal. And they pointed out it needed a heavier FI spring. Don't know if that's your issue. But just sharing experiences.
 

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kcc0521

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I don't know what regulator your kit uses. But my kit came with a holley. It also came with two springs. Of course the installer put in the wrong spring in the regulator. So we had issues til I called lethal. And they pointed out it needed a heavier FI spring. Don't know if that's your issue. But just sharing experiences.
Thanks for the info. It is a fore regulator and it didn’t come with additional springs.
 

ckendri

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I had the same experience as you with the regulator needing constant attention. It seems like it may have settled down after about 1000 miles. I’m not real sure why, but I still constantly check it.
 

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main power we get fromt the battery with the yellow gray as the trigger, make sure you are tightening the nut back down on the regulator if you don't, it will move around
 

hoot12

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Beef, you using the yellow gray wire for trigger source?? My installer used the purple with green stripe wire. Could this be causing my pump or pumps to run for 3 solid minutes when I simply open the door??
 

Tommy V

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Beef, you using the yellow gray wire for trigger source?? My installer used the purple with green stripe wire. Could this be causing my pump or pumps to run for 3 solid minutes when I simply open the door??
Yep,need to use yellow/gray.
 

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hoot12

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Gotcha. I'm curious as to the difference in those 2 wires?? i'm guessing both are for power, but act a little different? And this might sound dumb, but would I need to notify the tuner to make any modifications in the tune??
Thank you Beef
 

hoot12

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Beef, here is what my wire situation looks like.....see pic
20190515_185000_resized.jpg
 

Tommy V

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Dude im telling you ive done several of these and you need to tie into the yellow ans gray wire.That wire only primes the pumps for about 2 to 3 seconds then cuts off until you hit the start button.The purple wire is 12 volts constant once either the brake or start button is hit.
 

hoot12

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That makes perfect sense cause currently the pumps run for 3 solid minutes priming until I crank the car....which has always seemed wrong to me. What your saying sounds right!! I'm definitely not disagreeing. My installer and tuner are trying to convince me that i'm okay, but I don't really agree.
So, swap the wires and then the prime is only for a short second or two and all is good! Do I need to retune anything when I swap the wire?
 

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I have seen and fixed this more than once. Check your wiring, this is exactly where one pump runs out of fuel. Where is the vacuum line attached for the boost line to fire the other pumps? Also how is the controller wired to fire the secondary pumps. Two of those pumps on E85 and 1050's will support 1000rwhp. The third pump is not even needed.
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