Shortening Fuel Rail Question

Reply Subscribe

Thread Tools

Search this Thread

Apr 25, 2008 | 10:50 PM

Robert56

Thread Starter

TECH Senior Member

iTrader: (2)

Joined: Aug 2003

Posts: 9,557

Likes: 1

From: Tacoma, WA

Shortening Fuel Rail Question

Anyone see any problems with shortening the drivers side fuel rail (Edelbrock with 3/8 pipe thread) 7/8ths of an inch? this puts the fuel in closer to number 8 cylinder, but can't think of any issues this may cause? On the C5 Vettes the drivers side cowl is much closer than the passenger and not enough room to get any pipe thread fitting into, so it's either cut a hole (last choice) in the firewall or cut down the fuel rail. There is a Banjo x o-ring 90* fitting, but because of the 3/8 inch pipe thread this tight space fitting won't work. Any insight out there? Thanks
Robert

Edit: After looking at the rail with the injector in place, where the angled hole enters the rail chamber, looks as though we could only cut about 3/8ths of an inch off, and maybe, just maybe ½ inch, damn, need a fix.

Last edited by Robert56; Apr 26, 2008 at 05:35 PM.

Apr 26, 2008 | 02:46 PM

405HP_Z06

TECH Addict

iTrader: (11)

Joined: Jun 2003

Posts: 2,215

Likes: 19

From: Arlington, Tx

Quote:

Originally Posted by Robert56

Anyone see any problems with shortening the drivers side fuel rail (Edelbrock with ½ pipe thread) 7/8ths of an inch? this puts the fuel in closer to number 8 cylinder, but can't think of any issues this may cause? On the C5 Vettes the drivers side cowl is much closer than the passenger and not enough room to get any pipe thread fitting into, so it's either cut a hole (last choice) in the firewall or cut down the fuel rail. There is a Banjo x o-ring 90* fitting, but because of the ½ inch pipe thread this tight space fitting won't work. Any insight out there? Thanks
Robert

Robert,
I purchased some Professional Product fuel rails for my Z06 and had the same problem. The drivers side rail is too long and hits the firewall. I called PP and they recommended milling the end down 1/2" to clear the firewall. I didn't do that, but don't think it would be an issue with NPT fittings.

Apr 26, 2008 | 05:38 PM

Robert56

Thread Starter

TECH Senior Member

iTrader: (2)

Joined: Aug 2003

Posts: 9,557

Likes: 1

From: Tacoma, WA

Quote:

Originally Posted by 405HP_Z06

I looked again and it's 3/8ths pipe thread. yea, I'll just hack off about ½inch with a band saw and re-tap. One of the guys at the vetteforum sells a rail kit with fittings and crossover hose that fits with no mods, for about $165, not a bad deal, but already have these... Thanks
Robert

Edit: Were your rails 1/2 or 3/8ths pipe thread?

Last edited by Robert56; Apr 26, 2008 at 06:25 PM.

Apr 29, 2008 | 10:34 PM

GrannySShifting

TECH Junkie

iTrader: (10)

Joined: Nov 2001

Posts: 3,944

Likes: 21

From: Glen Burnie, Md

if all your talking about is moving the fitting closer to the inj for clearence its fine, its a commonly regulated plenum should be no difference if your reg is good

Apr 29, 2008 | 10:44 PM

Robert56

Thread Starter

TECH Senior Member

iTrader: (2)

Joined: Aug 2003

Posts: 9,557

Likes: 1

From: Tacoma, WA

Quote:

Originally Posted by GrannySShifting

if all your talking about is moving the fitting closer to the inj for clearence its fine, its a commonly regulated plenum should be no difference if your reg is good

yea, that's what I figured, but didn't know if there might have been unforeseen issue being just about on top of the injector hole. One 1/2 inch is gone and it's tapped now and new fitting in place.
Robert

Reply Subscribe