Holley sniper efi
Thread Starter
Instructor
Joined: Apr 2009
Posts: 175
Likes: 12
From: Jacksonville NC
Holley sniper efi
i purchased a sniper master kit and in stalled on my garage floor over 3 day period making sure everything looked professional and clean. Fired right up and ran great, car is a 383 stroker 440 hp 480 torque and the idol was amazing with no raw fuel fumes like withe the Quadrajet. Car was still in learning phase When I was about to test drive and it cut off. Went through all the set up directions again and still no start, could hear fuel pump cycle for 5 seconds but the injectors are not priming up for starting. Called Holley tec for help and did few thing to no help. Was told they believe it fuel pressure issue. Built in fuel pressure regulator is set at 58 psi. I purchased a fuel pressure test kit from harbor freight and tested and pump will only build 10 psi on each 5 second cycle and I did that 5-6 times and will only reach 35 psi. So bad fuel pump with only 20-30 minutes run time on it. In line gauge is a good option . Hope this will help someone one if they run in to this.
Robert
USMC Retired
Robert
USMC Retired
Racer
Joined: Nov 2011
Posts: 285
Likes: 36
From: Cedar Park TX
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,169
Likes: 9,297
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
pics of your setup please?
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Thread Starter
Instructor
Joined: Apr 2009
Posts: 175
Likes: 12
From: Jacksonville NC
Thread Starter
Instructor
Joined: Apr 2009
Posts: 175
Likes: 12
From: Jacksonville NC
Holley sniper efi
I got my replacement fuel pump in today and put it together and no luck car still not running.
I took fuel line off of throttle body and put fuel pressure gauge again and this one is only 22 psi max. I am lost on what it could be, could I have gotten another bad pump? I checked ground again to confirm it was good and check all the lines to make sure there is no kinks. I used the factory 3/8 metal line, I even put the pressure gauge at the pump to verify its not the lines and it's still 22psi.
3rd Gear
Joined: Jul 2018
Posts: 3
Likes: 0
Have a few questions about fuel and return line, along with gas tank.
What gas tank did you go with, or did you adapt the existing one to make it work?
Did you run fuel lines down the rails with the flex hose, or connect it to the factory hard lines running down the passenger side?
What did you do for return line?
About to pull the trigger on this and these are quesitons i have.
THANKS!
What gas tank did you go with, or did you adapt the existing one to make it work?
Did you run fuel lines down the rails with the flex hose, or connect it to the factory hard lines running down the passenger side?
What did you do for return line?
About to pull the trigger on this and these are quesitons i have.
THANKS!
Thread Starter
Instructor
Joined: Apr 2009
Posts: 175
Likes: 12
From: Jacksonville NC
Efi
Have a few questions about fuel and return line, along with gas tank.
What gas tank did you go with, or did you adapt the existing one to make it work?
Did you run fuel lines down the rails with the flex hose, or connect it to the factory hard lines running down the passenger side?
What did you do for return line?
About to pull the trigger on this and these are quesitons i have.
THANKS!
What gas tank did you go with, or did you adapt the existing one to make it work?
Did you run fuel lines down the rails with the flex hose, or connect it to the factory hard lines running down the passenger side?
What did you do for return line?
About to pull the trigger on this and these are quesitons i have.
THANKS!
Racer
Joined: Jul 2015
Posts: 396
Likes: 101
From: Lehigh Valley Pennsylvania
Can you run the pump inlet hose to a 2 gal portable gas tank and try it? This would eliminate all the screens, connections and vents in the tank itself. Sounds like it is either 2 bad pumps or a restriction in the tank/ inlet. .
Thread Starter
Instructor
Joined: Apr 2009
Posts: 175
Likes: 12
From: Jacksonville NC
Efi
I did just what you said and had 97psi and blew in tank line and connected back and got 40psi. Pump is sucking strainer closed. Draining tank now so I can drop it and put new strainer on. Thanks for your reply to my frustration Sir. I feel better now at least knowing whats wrong.
Last edited by edusmc1; Jul 19, 2018 at 10:07 AM.
Advanced
Joined: May 2015
Posts: 72
Likes: 4
From: Alvin Texas
I sometimes have the same problem with my Fitech. I have my pump and filter like yours and my lines coming from my tank from the original outlet. If the pump does not have a good head pressure on it I get a vapor lock in the pump. I have to take the line off and prime the pump to get the pressure back up to EFI pressures. I will soon be replacing the intake screen with a Holley Fuel Mat to see if this helps and low tank levels.
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,169
Likes: 9,297
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
let me know how the stock return line works. I've read it should be 3/8s but if the 5/16 will work that is less to change
Thread Starter
Instructor
Joined: Apr 2009
Posts: 175
Likes: 12
From: Jacksonville NC
REturn line
I called Holley first and they said as long as you have at least 5/16 line there’s no problem. That’s why I used it. It just for return fuel from Tbilisi to tank and has little to no psi on it.
Thread Starter
Instructor
Joined: Apr 2009
Posts: 175
Likes: 12
From: Jacksonville NC
Efi
I sometimes have the same problem with my Fitech. I have my pump and filter like yours and my lines coming from my tank from the original outlet. If the pump does not have a good head pressure on it I get a vapor lock in the pump. I have to take the line off and prime the pump to get the pressure back up to EFI pressures. I will soon be replacing the intake screen with a Holley Fuel Mat to see if this helps and low tank levels.
Last edited by edusmc1; Jul 20, 2018 at 07:52 AM.