Wow... looks nice Wish I had an external fuel filter setup

 

Check valve is in the in-tank pump on a return style system which is before the inline pump....so I doubt it effected the stock pump check valve. I did not pop the FPR open, but the new pump only added about 2lbs of pressure at idle over what the stocker was delivering so i doubt thats it either, but it will only take a second to pop it off and look. The fact that it effected Mike the same way is telling me there is something else going on.

My hypothosis is the fuel is draining back into the inline pump when it turns off. Thats a pretty large pump and could most likely hold a pint of fuel. What i dont know is if the pump is "full" when pumping. I would imaging the pump pressure would not allow the pump to actaully "fill up" while in pumping mode, but when the pump stops the cavity of the pump fills with fuel thus relieving the sytem of pressure. I would like to hear from others who added the inline pump to see if it effected them the same way. I bet a check valve on the output side of the pump would solve it. Something like this.....



I want to get a few days of testing under my belt before I go writing anything up.....wanna make sure it working the way i want it too .....but the complete parts list is in the first post in this thread.
And yeah, that was the idea with the rubber coupling, it fit perfectly and I am sure it helped to dampen the sound a bit.

Thanks Bill.

 

Lookin good...great job on the install

 

Me personally...I'd put that check valve on the supply side of the pump. If it is drainging from the pump as you say it might, why not keep it full. However, in hind sight of that statement, I'd imagine putting that check valve anywhere in the line would make a huge difference. (I'd still put it on the supply side, just babbling my reasoning)

Also, I bet the mount setup you made is the main reasoning it is quieter than expected. Looks good Jim!

 

Good point....hell, maybe i will get two!! LOL

 

Just did a few hours of road testing and RR AutoVE Tuning. This sucker seems to be doing quite well...definately helping the stock pump in the upper RPMs. I used to have trouble getting below an AFR of 12 with the stock pump but now it dips into the low 11's with no problem. I had to actually pull some fuel from the boost VE table because it was dropping below commanded AFR. Did several (more than several) WOT runs and it never missed a beat. Pressure seems to be about the same as the stock pump all around....idle, cruise, WOT, all seem about the same but the volume of fuel must be more or i would not be seeing the difference in AFR that I am seeing.

First test = Great results!

 

I'l bet that you were hoping that I wouldn't remember that you said previously that you did not have a way to measure pressure. Maybe it was that you couldn't log it in your tuning program, if so, sorry to bring it up.

 

I can monitor fuel pressure via my gauge...but I cant log it in EFILive. Sort of like voltage vs. amperage i guess. I had a 120v 5A circuit before....but now I have a 120v 20A circuit

 

Ok, now that you have the fuel taken care of it's time for more BOOST!!!! Oh wait.....

 

Turbo Time