1974 From Carb to Finally Sniper EFI - CorvetteForum - Chevrolet Corvette Forum Discussion

Notices
C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette

1974 From Carb to Finally Sniper EFI

Reply

 
 
 
Old 01-23-2018, 03:14 PM
  #1  
redcruz1120
CF Senior Member
Thread Starter
 
redcruz1120's Avatar
 
Member Since: Feb 2007
Location: Pearland Texas
Posts: 1,324
Thanked 86 Times in 67 Posts
St. Jude Donor '09
Default 1974 From Carb to Finally Sniper EFI

After waiting over a half year due to back order, I just started my Sniper EFI conversion last week on my ZZ5. Will be using a Tanks inc.tank with in tank fuel pump regulated close to the tank with a filter regulator and feeding it with the 3/8s fuel line. so far so good as far as the installation goes. Its been fun. Hope it stays that way all the way through with a successful completion and start up. I'd like to thank forum member Dembo for posting pictures of his set up a while back which got me a good start. Stay tuned for more pictures any feedback is welcomed!!....






















Last edited by redcruz1120; 01-23-2018 at 05:09 PM. Reason: adding a sentence
redcruz1120 is offline  
Reply With Quote
Old 01-23-2018, 05:04 PM
  #2  
7T1vette
CF Senior Member
 
7T1vette's Avatar
 
Member Since: Jan 2006
Location: Crossville TN
Posts: 29,488
Thanked 840 Times in 753 Posts
Default

Very nice. Let us know how starting, idle, driveability, performance and mileage are affected from the change.

7T1vette is offline  
Reply With Quote
Old 01-24-2018, 06:14 PM
  #3  
F4Gary
CF Senior Member
 
F4Gary's Avatar
 
Member Since: Feb 2001
Location: Grapevine Tx
Posts: 2,577
Thanked 71 Times in 53 Posts
2016 C3 of the Year Finalist
Default

Is that the fuel filter in front of the tank?
F4Gary is online now  
Reply With Quote
Old 01-24-2018, 06:41 PM
  #4  
george2066
CF Senior Member
 
Member Since: Oct 2002
Location: jim thorpe pa
Posts: 176
Thanked 8 Times in 8 Posts
Default how deep are you in

just a round about number
george2066 is offline  
Reply With Quote
Old 01-24-2018, 08:29 PM
  #5  
theandies
CF Senior Member
 
theandies's Avatar
 
Member Since: Jun 2001
Location: "The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants."
Posts: 16,516
Thanked 241 Times in 199 Posts
Default

Does a '74 have a vented fuel cap? If not how are you going about venting the tank?
I want to do this soooooo bad. Please let us know how you like the Sniper because I'll eventually do this and I'm reading everything I can on the Sniper and FiTech systems.
theandies is offline  
Reply With Quote
Old 01-24-2018, 09:43 PM
  #6  
BLUE1972
CF Senior Member
 
BLUE1972's Avatar
 
Member Since: Oct 2008
Location: FARMINGDALE N..Y.
Posts: 1,478
Thanked 182 Times in 165 Posts
Default

Mid 71 they went from a vented tank cap to a non-vented tank cap. The pre- mid 71's vented via the gas cap. The mid 71 and up vent through the charcoal canister.

74 - non vented gas cap.

Non vented tank caps had a vapor liquid separator on the left side of the tank - that hooked to a vent fitting / line on the tank and the steel line to the Charcoal Canister.

Last edited by BLUE1972; 01-24-2018 at 09:46 PM.
BLUE1972 is offline  
Reply With Quote
Old 01-24-2018, 10:17 PM
  #7  
OldCarBum
CF Senior Member
 
Member Since: Mar 2016
Location: Napa California
Posts: 1,523
Thanked 229 Times in 188 Posts
Default

Originally Posted by theandies View Post
Does a '74 have a vented fuel cap? If not how are you going about venting the tank?
I want to do this soooooo bad. Please let us know how you like the Sniper because I'll eventually do this and I'm reading everything I can on the Sniper and FiTech systems.
I am considering putting it on my 73 496 and am doing the research now as well. I'm very interested in this thread and the OP's results.

Last edited by OldCarBum; 01-24-2018 at 10:18 PM.
OldCarBum is offline  
Reply With Quote
Old 01-24-2018, 11:56 PM
  #8  
7T1vette
CF Senior Member
 
7T1vette's Avatar
 
Member Since: Jan 2006
Location: Crossville TN
Posts: 29,488
Thanked 840 Times in 753 Posts
Default

Once these cars went to the fuel vapor recovery tank system, THAT became the vent for the fuel tank. Fuel cap was then non-vented.
7T1vette is offline  
Reply With Quote
Old 01-25-2018, 04:43 AM
  #9  
terrys6t8roadster
CF Senior Member
 
terrys6t8roadster's Avatar
 
Member Since: May 2012
Location: Allenton Wisconsin
Posts: 1,573
Thanked 139 Times in 136 Posts
Default

My Sniper system just arrived yesterday, maybe my install might turn out as nice as redcruz1120. T
terrys6t8roadster is offline  
Reply With Quote
Old 01-25-2018, 11:27 AM
  #10  
redcruz1120
CF Senior Member
Thread Starter
 
redcruz1120's Avatar
 
Member Since: Feb 2007
Location: Pearland Texas
Posts: 1,324
Thanked 86 Times in 67 Posts
St. Jude Donor '09
Default

Originally Posted by F4Gary View Post
Is that the fuel filter in front of the tank?
Yes it is. A filter/ Regulator.
redcruz1120 is offline  
Reply With Quote
Old 01-25-2018, 11:29 AM
  #11  
redcruz1120
CF Senior Member
Thread Starter
 
redcruz1120's Avatar
 
Member Since: Feb 2007
Location: Pearland Texas
Posts: 1,324
Thanked 86 Times in 67 Posts
St. Jude Donor '09
Default

Originally Posted by george2066 View Post
just a round about number
Around roughly $1700. Including all AN Fittings and black braided hoses. $999 for Unit, around $+600 for tank, pump,sending unit

Last edited by redcruz1120; 01-25-2018 at 11:31 AM.
redcruz1120 is offline  
Reply With Quote
Old 01-25-2018, 11:32 AM
  #12  
redcruz1120
CF Senior Member
Thread Starter
 
redcruz1120's Avatar
 
Member Since: Feb 2007
Location: Pearland Texas
Posts: 1,324
Thanked 86 Times in 67 Posts
St. Jude Donor '09
Default

Originally Posted by theandies View Post
Does a '74 have a vented fuel cap? If not how are you going about venting the tank?
I want to do this soooooo bad. Please let us know how you like the Sniper because I'll eventually do this and I'm reading everything I can on the Sniper and FiTech systems.
Non vented but my tank came with a vent valve.
redcruz1120 is offline  
Reply With Quote
Old 01-25-2018, 11:34 AM
  #13  
redcruz1120
CF Senior Member
Thread Starter
 
redcruz1120's Avatar
 
Member Since: Feb 2007
Location: Pearland Texas
Posts: 1,324
Thanked 86 Times in 67 Posts
St. Jude Donor '09
Default

Originally Posted by terrys6t8roadster View Post
My Sniper system just arrived yesterday, maybe my install might turn out as nice as redcruz1120. T
it will. it's turning out easier than what I expected. the hardest part was finding someone to weld the oxygen bung,
redcruz1120 is offline  
Reply With Quote
Old 01-25-2018, 12:05 PM
  #14  
OldCarBum
CF Senior Member
 
Member Since: Mar 2016
Location: Napa California
Posts: 1,523
Thanked 229 Times in 188 Posts
Default

Nice.
Please keep the results coming and thanks for taking the time to answer every ones questions.

Last edited by OldCarBum; 01-25-2018 at 12:05 PM.
OldCarBum is offline  
Reply With Quote
Old 01-25-2018, 05:11 PM
  #15  
redcruz1120
CF Senior Member
Thread Starter
 
redcruz1120's Avatar
 
Member Since: Feb 2007
Location: Pearland Texas
Posts: 1,324
Thanked 86 Times in 67 Posts
St. Jude Donor '09
Default

. Hopefully I'll be able to get it started this Sunday. It's my off day
Originally Posted by OldCarBum View Post
Nice.
Please keep the results coming and thanks for taking the time to answer every ones questions.

Last edited by redcruz1120; 01-25-2018 at 05:12 PM.
redcruz1120 is offline  
Reply With Quote
Old 01-25-2018, 08:52 PM
  #16  
js1977
CF Senior Member
 
js1977's Avatar
 
Member Since: Jul 2014
Location: Washington
Posts: 324
Thanked 5 Times in 5 Posts
Default

I put a EFI system (MSD atomic) on my 69 GTO and I love it. It runs so smooth and gives instant response when you press the gas. I can easily light them up at 40mph if I'm not careful, haha! Just be aware that if it's like the MSD system, it takes a few starts for it to learn what the car needs and doesn't need.
js1977 is offline  
Reply With Quote
Old 01-25-2018, 10:11 PM
  #17  
flyeri
CF Senior Member
 
flyeri's Avatar
 
Member Since: Mar 2011
Location: Kernersville NC
Posts: 1,174
Thanked 67 Times in 59 Posts
Default

Originally Posted by redcruz1120 View Post
Yes it is. A filter/ Regulator.
Why are you using a regulator there? I thought the Sniper had a regulator in the throttle body eliminating the need for one. Am I mistaken? I'm planning the same upgrade, tank and all so I really appreciate your post and pictures.
flyeri is offline  
Reply With Quote
Old 01-25-2018, 11:53 PM
  #18  
redcruz1120
CF Senior Member
Thread Starter
 
redcruz1120's Avatar
 
Member Since: Feb 2007
Location: Pearland Texas
Posts: 1,324
Thanked 86 Times in 67 Posts
St. Jude Donor '09
Default

Originally Posted by flyeri View Post
Why are you using a regulator there? I thought the Sniper had a regulator in the throttle body eliminating the need for one. Am I mistaken? I'm planning the same upgrade, tank and all so I really appreciate your post and pictures.
Yes it does have a built in regulator but my return line would be too small and I want to minimize the use of hose all the way from engine to the tank.. this way it spills back to tank from about a foot away via Steel tubing.
redcruz1120 is offline  
Reply With Quote
Old 01-26-2018, 01:59 AM
  #19  
terrys6t8roadster
CF Senior Member
 
terrys6t8roadster's Avatar
 
Member Since: May 2012
Location: Allenton Wisconsin
Posts: 1,573
Thanked 139 Times in 136 Posts
Default

Originally Posted by redcruz1120 View Post
Yes it does have a built in regulator but my return line would be too small and I want to minimize the use of hose all the way from engine to the tank.. this way it spills back to tank from about a foot away via Steel tubing.
I like your idea of minimizing the hosing. What part number for the regulator and where did you get it? T
terrys6t8roadster is offline  
Reply With Quote
Old 01-26-2018, 12:46 PM
  #20  
redcruz1120
CF Senior Member
Thread Starter
 
redcruz1120's Avatar
 
Member Since: Feb 2007
Location: Pearland Texas
Posts: 1,324
Thanked 86 Times in 67 Posts
St. Jude Donor '09
Default

Originally Posted by terrys6t8roadster View Post
I like your idea of minimizing the hosing. What part number for the regulator and where did you get it? T

from Tanks inc. part #LS9904. They also offer it in a kit form which includes the AN fitting connections.
redcruz1120 is offline  
Reply With Quote
The Following User Says Thank You to redcruz1120 For This Useful Post:
terrys6t8roadster (01-27-2018)

Thread Tools
Search this Thread
Quick Reply: 1974 From Carb to Finally Sniper EFI


Sponsored Ads
Vendor Directory

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: