LZ9 fuel rail modifications

Real tech discussion on design, fabrication, testing, development of custom or adapted parts for Pontiac Fieros. Not questions about the power a CAI will give.

Moderators: The Dark Side of Will, Series8217

Post Reply
User avatar
Shaun41178(2)
Posts: 8736
Joined: Fri Nov 19, 2004 7:12 pm
Location: Ben Phelps is an alleged scammer

LZ9 fuel rail modifications

Post by Shaun41178(2) »

I made a video of modifying an lz4/9 fuel rail for what I hope is more flow, and lower injector DC.
https://youtu.be/aDeFuH7K-9s?si=9kIBJdAdUL1KJMPf

It all fits under an lz4 upper no problem. Now there are two test ports.

After pressure testing I cleaned up the routing of the fuel lines and installed hose clamps. No leaks. I used a pair of 1/2 inch tube to 6an fittings.
IMG_20250221_203458494.jpg
IMG_20250221_203458494.jpg (2.9 MiB) Viewed 13488 times
Any questions feel free to ask.
User avatar
Shaun41178(2)
Posts: 8736
Joined: Fri Nov 19, 2004 7:12 pm
Location: Ben Phelps is an alleged scammer

Re: LZ9 fuel rail modifications

Post by Shaun41178(2) »

FieroPhrek working on that ls4 swap for 20 years and counting now. 20 years!!!!! LOL


BEWARE OF BEN PHELPS AND WOT-TECH MOTORSPORTS. YOU HAVE BEEN WARNED. WORSE THAN MILZY IMO
User avatar
Shaun41178(2)
Posts: 8736
Joined: Fri Nov 19, 2004 7:12 pm
Location: Ben Phelps is an alleged scammer

Re: LZ9 fuel rail modifications

Post by Shaun41178(2) »

Laid the upper intake back on tonight and it all fits. The fitting on the rail near the tb just barely clears the neck of the upper intake but it does.

I figured this method was easier and cheaper than custom aftermarket fuel rails
ericjon262
Posts: 3082
Joined: Mon May 24, 2010 5:34 pm
Location: Aiken, SC

Re: LZ9 fuel rail modifications

Post by ericjon262 »

were you noticing fuel pressure issues in your logs?
"I am not what you so glibly call to be a civilized man. I have broken with society for reasons which I alone am able to appreciate. I am therefore not subject to it's stupid laws, and I ask you to never allude to them in my presence again."
User avatar
Shaun41178(2)
Posts: 8736
Joined: Fri Nov 19, 2004 7:12 pm
Location: Ben Phelps is an alleged scammer

Re: LZ9 fuel rail modifications

Post by Shaun41178(2) »

ericjon262 wrote: Wed Feb 26, 2025 6:10 pm were you noticing fuel pressure issues in your logs?
I don't log fuel pressure. Unfortunately Don't have a sensor for that
Post Reply