Forcefed86

iTrader: (4)

Buddy stopped by with his supercharged C5 the other day. Noticed they were using the fuel pressure port on the LS1 fuel rails as an additional fuel supply with an additional pump and regulator tapped into it. Seemed like a pretty slick idea. So I went EBay shopping.

1 45* -4 an push lock fitting $4 (90* might work better now that I have done it)
1 180* -4 push lock fitting. $4

http://www.ebay.com/itm/171804502841...%3AMEBIDX%3AIT


-AN4 (¼”) push lock hose. $14

http://www.ebay.com/itm/132032023101...%3AMEBIDX%3AIT


AN8 adapter with a 1/8th NPT pipe tap. $7

http://www.ebay.com/itm/401098081761...%3AMEBIDX%3AIT


AN4 to 1/8th NPT. $4

http://www.ebay.com/itm/4AN-4-AN-4-M...pVucRy&vxp=mtr


On the factory rails I’ve run 160 in the ¼ at 3100lbs on E85 without this… But I figure I’m on the edge with factory dead headed rails and it can't hurt. Originally planned to tap the regulator for the supply, but I didn't have that fitting and had the other laying around.

I’m sure I’m not the first to do it and don’t claim to be… just throwing it out there with a quick easy shopping list.

Beanslsxnova

iTrader: (1)

Seems like a cool idea. I maybe missing something but how did he get from 4an to the Schrader fitting on the end of the rail. Kinda hard to see in the picture

Forcefed86

iTrader: (4)

The factory pressure port is an AN4. (at least close enough to seal) Just need to pop the schrader valve out and thread on the AN4 fitting.

It’s basically this…

ezzlez28

iTrader: (21)

Nitrous guys have been doing that for a long time.

Forcefed86

iTrader: (4)

And the supercharged guys apparently. As I mentioned above, I’m not claiming to have found something new. Just throwing the cheap easy shopping list out there and trying it make it more known for the JY turbo folks. For the amount of $ and effort I would have done it a long time ago if I had known about it.

ddnspider

iTrader: (26)

You have a recommendation on a cheap FPR to mate those fittings to?

Forcefed86

iTrader: (4)

I don't use the ebay regulators, couldn't find one large enough for E85 with actual 1/2" supply and returns.

The $150 Mallory unit was the cheapest I found that looked up to the task, so that's what I used.

https://www.summitracing.com/parts/msd-29389/overview/

JoeNova

If your regulator isn't a restriction, just Y off of the regulator into both ports.
I have -8 feed/return going to my regulator, and then I neck it down to the 3/8" stock feed. Something like this would benefit me since my pumps/lines/regulator are all bigger than the stock rail feed size.

Although with truck rails, you can drill/tap directly into the ends of the rails since the aluminum there is very thick.

ddnspider

iTrader: (26)

Dang thats expensive. I assume its cause its E85 like you said. Speed Inc sells regular ones for about 100 bucks so not terrible. Can you stick a FPR at the input of the rail with a single feed line to regulate the FPR at the rail and keep it returnless? My old car I did a FPR after the rail and had a separate return line, but on this car once i added an inline pump Im guessing I should have a FPR at the rail.

Forcefed86

iTrader: (4)

From what I could find, $150 is pretty cheap for ½ inlet/outlet rising rate FPR. If you know of a cheaper one let me know!

The $100ish FPR from Speed inc. just looks like a china cheapie. Also seems fishy they are only rated to 65psi?

I’d just grab and EBay unit if -6 inlets/outlets were enough. Should be plenty for most using gas depending on the HP goal. I’ve used these $40 deals on other builds with no issue at around 100psi. You could always use 2 of them as well.

http://www.ebay.com/itm/Adjustable-F...9V6bfs&vxp=mtr

ddnspider

iTrader: (26)

Did you see that both Aeromotive FPR's are cheaper from Speed Inc. than the link you posted.....but they are also 6AN. I assumed the 1 that states its for an A1000 would be enough to do the job, but could be wrong. Also didnt look if its E85 approved.

That ebay knock off aeromotive is hilarious. I might need to try that for $40 bucks Now I just need to understand if you can deadhead the FPR inline with the rail with no return.

JoeNova

Nitrous guy have been doing it to pull fuel out of the rails, not put more into them.

Forcefed86

iTrader: (4)

Run the return off the regulator and dead head it to the rails. Works great near as I can tell. Gone 8.70’s on my stock ls1 rails dead headed anyway, and that’s on E85. 1 4303 pump and the above mentioned regulator.

ddnspider

iTrader: (26)

Are you saying cap the output of the FPR and set the return of the FPR to the rails? Can't say I've seen that before, but if it works who cares lol.

Forcefed86

iTrader: (4)

No. Run the supply and return to the regulator itself. Then run an additional line form the regular to the dead headed rails. Can see it easier on skinnies old rx7. (Returns on the bottom of the regulator)

ddnspider

iTrader: (26)

I swear I must be dumb cause I can't visualize it. Where does the "additional line from the regulator to the deadhead rails" connect at the rails?

RealQuick

iTrader: (14)

Thanks for contributing to the forum. Even though you didn't invent this, I am sure it will be useful to many.

Forcefed86

iTrader: (4)

Like this

ddnspider

iTrader: (26)

So you're saying the return goes in the shrader valve opening (with the shrader valve removed obviously)? So you actually have 2 connections to the rail and the FPR will balance pressure by "venting" pressure out the return, but that actually will keep the pressure up because its connected back to the rail?

JoeNova

No, he is talking about using a 4 port regulator.
The regulator will have a single inlet, 2 outlets, and a return. The 2 outlets go to the ports on the rail. The return goes back to the tank from the regulator like normal.

I'm still in favor of just using a Y on a -8 AN 3-port regulator to split the feed to both ports on the rails. A single -8 AN line has more area than both a -6 and -4 combined.