My modified stock fuel rail

[TGGT]

So back when I put the procharger on I modified the stock rail with an additional feed. When my tuner tuned my car the logs showed I was dropping to 43ish psi between 7300 - 8k. I decided to try one more thing for these stock rails before ponying up the dough for some aftermarket’s. I basically cut the rails in half making for two separate rails. I then flared the tubing going into the rails adding a tube nut and collar to both sides. I re flared the factory feed line for a factory style connector, and I’m using it for the return to the regulator as well as to feed the di pump. I’m not totally sure what if any difference this will make but I will say I did a fourth gear pull on the way home and the a/f was supper rich 7.2-7.4. Hopefully I can get my tuner to data log it this week. I’m super curious if it’s still dropping pressure.

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[Bmaughan]

Awesome! Looks great... where can you find the factory crimp tool?

 

[TGGT]

Awesome! Looks great... where can you find the factory crimp tool?

Thanks. The factory style flaring tool is part of the blue point hydraulic flaring tool kit we have at the shop I work at. I think you can get that kit for 4 or 5 hundred dollars

 

[Bmaughan]

Thanks. The factory style flaring tool is part of the blue point hydraulic flaring tool kit we have at the shop I work at. I think you can get that kit for 4 or 5 hundred dollars

cool...I’m sure that’s nice to have around.

 

[TGGT]

cool...I’m sure that’s nice to have around.

It’s super handy. We use it a lot.

 

[illtal]

looks like you bypassed the restriction in the port side of the the factory rail that one tiny crossover has a restrictor in it.

 

[TGGT]

looks like you bypassed the restriction in the port side of the the factory rail that one tiny crossover has a restrictor in it.

yes. The fuel goes right from the pumps into a -6 y fitting and then -6 lines into each rail. I’m now using the small feed line to feed the di pump and the regulator. I just hope it’s enough fuel flow for the di pump

 

[illtal]

yes. The fuel goes right from the pumps into a -6 y fitting and then -6 lines into each rail. I’m now using the small feed line to feed the di pump and the regulator. I just hope it’s enough fuel flow for the di pump

Well it doesn't matter since you used a Y to feed the "top & and Bottom" together, before you could only feed the top (DI) and the crossover feed the port side through that tiny piece, now you are feeding the bottom together with the top so the crossover isn't doing anything anymore.

EDIT
The DI is still getting what it got originally.

 

[TGGT]

Well it doesn't matter since you used a Y to feed the "top & and Bottom" together, before you could only feed the top (DI) and the crossover feed the port side through that tiny piece, now you are feeding the bottom together with the top so the crossover isn't doing anything anymore.

EDIT
The DI is still getting what it got originally.

That was my thought as well. The only odd thing is that the fuel pressure gauge on my regulator pulsates really fast. I believe this is due to feed back from the di pump and probably isn’t a big deal.

 

[illtal]

that 90 degree ubend is from the fuel pump right? where is the second feed to the DI which used to be on the top?
Mind had a feed on top from the driver side, and a feed on the passenger side to the di, looks like you have the feed into the port first from the UBend, and do you have a feed in the top for the stock 3/8 feed?

I see your DI Feed here in the front. Mine had a green feed for the in-rail and a stainless one for the DI what is your regulator set for and what kind of pumps are you using

 

[TGGT]

that 90 degree ubend is from the fuel pump right? where is the second feed to the DI which used to be on the top?
Mind had a feed on top from the driver side, and a feed on the passenger side to the di, looks like you have the feed into the port first from the UBend, and do you have a feed in the top for the stock 3/8 feed?

I see your DI Feed here in the front. Mine had a green feed for the in-rail and a stainless one for the DI what is your regulator set for and what kind of pumps are you using

both rails are fed individually from the pumps. From there it back feeds through the small factory crossover tube to feed the di pump. The end of that same line that used to be the fuel inlet now goes to the regulator. I’m using a stock gt350 twin pump setup

 

[illtal]

both rails are fed individually from the pumps. From there it back feeds through the small factory crossover tube to feed the di pump. The end of that same line that used to be the fuel inlet now goes to the regulator. I’m using a stock gt350 twin pump setup

Ok I had assumed you used the y block to dual feed the stock feed along with the new port feed combined.

Unless you modified the crossover you have a restriction there. You would probable be better off using a deadhead. Regulator to rail - regulator to tank (it is return?) That way u aren't returning cooked gas back to the tank.
You could also give the rail a bigger crossover from di to port. That way you bypass the restriction no matter how you plumb it.

 

[illtal]

Also that machining you did looks awesome

 

[TGGT]

The way I understand the fueling on these engines is this. From the factory they rely primarily on di and blend in port as needed. My tuner says that they basically flipped that scheme to where it’s primarily port and blends di as needed. I’m hoping that because of this the di pump can get by with a little less fuel supply.

 

[illtal]

The way I understand the fueling on these engines is this. From the factory they rely primarily on di and blend in port as needed. My tuner says that they basically flipped that scheme to where it’s primarily port and blends di as needed. I’m hoping that because of this the di pump can get by with a little less fuel supply.

EDIT

I reread your email. Makes sense. have at it. whose the tuner?
----------------------------
Edelbrock told me and a few other guys say the opposite. It's biased toward the DI, if you trace the flow of it regularly through that restrictors you can tell it's biased to the DI
See below -
https://www.mustang6g.com/forums/th...ding-fuel-upgrades.113637/page-5#post-2443233


Also here is a PM from Edelbrock tech

Edelbrock Tech, Feb 11, 2019
The factory rail is bias to the DI pump. There is that small crossover to the PI side but there is a restrictor in there. On boosted applications aftermarket rails should be used. Only one feed line comes from the pump in the tank to the drive side of the rail. The port on the passenger side just connects to the DI pump but is fed from from the same source as you can see.

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