C3 Vette Registry - The Best Resource on the Net for C3 Vettes! C3 Vette
Forums -> C3 Fuel, Emission Control, and Exhaust Systems
Not Logged In! Login or Register!  Users Online: 13 / Help 
Features  Find C3 Parts on ebay in only 2 or 3 clicks!  | Add YOUR C3 to the Registry

Supporting Vendors
VetteBookStore.com
Mid America Motorworks
CorvetteClothing.com
Bair's Corvettes
Volunteer Vette Products

C3 of the Month
None Current
Enter Yours Today!
Online C3 Show
13
C3s are Registered

Vanity Plates
CURVY 79
curvy79
Featured Links

Buy Now
Corvette Magazine - $19.99 for 8 issues
Corvette Magazine
Only $19.99 for 8 issues


Corvette Fifty Years (Hardcover)
Corvette Fifty Years (Hardcover)


Collector's Originality Guide Corvette 1968-1982 (Paperback)
Collector's Originality Guide Corvette 1968-1982 (Paperback)


Chevrolet Corvette: 1968 thru 1982, All V8 models (Haynes Manuals) (Paperback)
Chevrolet Corvette: 1968 thru 1982, All V8 models (Haynes Manuals) (Paperback)



| Hide Signatures and Profile Pics

 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
2/9/15 3:59pm - Original Message: 'Fuel pressure issuses'
DaveM Lifetime Member
Lifetime Member
- Send Private Message


Flanders, NJ - USA

Vette(s):
1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

Joined: 1/27/2004
Posts: 2530

I have an electric pump (in the tank) and I have a carb which needs about 6.5 psi. I installed a regulator but the most pressure I'm getting is 5.5 psi. the regulator adjusting screw is in as far as it will go. Any thoughts on what to look for or any other options.

This is an '82 with a ZZ4 engine with a Holley 770, (no mechanical pump)

Thanks,

Dave



____________________________________
 

Lifetime Member #116
Dave's '82


   
 Reply Reply  Quote Reply w/Quote
 
Support C3VR!
Suport our advertisers
2/9/15 4:34pm - Reply: 'Re: Fuel pressure issuses'
Sarge81 Lifetime Member
Lifetime Member
- Send Private Message


WEST SENECA, NY - USA

Vette(s):
1981 Blue Ice Met. w/pearl ghost flames TKO500 5speed. LS1 Swap 3.45 Dana 44.

Joined: 12/3/2001
Posts: 2376
Is there any way to get a pressure reading with no regulator in line? Maybe the pump isn't putting out to it's fullest potential.

Does the car still run?


____________________________________

GEN III 5.7L "LS6" Engine swap
TKO500 5 spd.
3.54 Dana 44
'69 "N11" Sidepipes
Borgeson Steering Box
Born 8/1981
Sequence #3975




Click here to see more pics of my Vette on CarDomain.


Lifetime Member #26
 Reply Reply  Quote Reply w/Quote
2/9/15 7:56pm - Reply: 'Re: Fuel pressure issuses'
DaveM Lifetime Member
Lifetime Member
- Send Private Message


Flanders, NJ - USA

Vette(s):
1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

Joined: 1/27/2004
Posts: 2530

The car runs. I'd have to disassemble the regulator and get a  fitting to go from the AN-8 to a 1/8NPT to mount a gage. Would be a pain in the a__. I don't see that pump going from 55psi(stock) down to 5psi. When I can get to the underside I'm going to change out the filter, maybe that will help?

Dave



____________________________________
 

Lifetime Member #116
Dave's '82


   
 Reply Reply  Quote Reply w/Quote
2/9/15 8:03pm - Reply: 'Re: Fuel pressure issuses'
crossfire1982
Standard Member
- Send Private Message


Cramerton, NC - USA

Vette(s):
black 1982 coupe slate gray interior, 350 crossfire, 1985 fuel pump, Steeroids R&P conversion

Joined: 8/22/2006
Posts: 1094
Dave, I know you did your engine upgrade quite some time back, did you change the pump at the same time?  The pump itself may indeed be your problem or if not replaced when you did the engine upgrade, the short hose section between the pump and output hard lines going to the engine.  If you still have the frame  rail mounted fuel filter, it may be worth a swap if its been a while since it was changed.

Update:You must have posted while I was typing.  From your reference to 55 psi you must have installed a C4 pump previously, probably when you were still running crossfire.  Id check the filter.

|UPDATED|2/9/2015 6:03:08 PM (AZT)|/UPDATED|


____________________________________

Click for a larger image
Save The Wave


 Reply Reply  Quote Reply w/Quote
2/9/15 11:50pm - Reply: 'Re: Fuel pressure issuses'
DaveM Lifetime Member
Lifetime Member
- Send Private Message


Flanders, NJ - USA

Vette(s):
1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

Joined: 1/27/2004
Posts: 2530

Hey Chip how are you? Yes I have the '85 pump in there. I have to wait for a little warmth, since I have to move the car outside to get under it to change the filter.

Thanks,

Dave



____________________________________
 

Lifetime Member #116
Dave's '82


   
 Reply Reply  Quote Reply w/Quote
2/10/15 1:34pm - Reply: 'Re: Fuel pressure issuses'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19454
Change the filter first, certainly. Thumbs Up
I would try to find a way to test the fuel pressure before the reg. at the same time, if possible. As was mentioned, the rubber-like hose on the fuel pump can split/crack, and cause a severe loss of pressure and volume, as could a collapsed "sock" filter on the end of the pick-up tube on the sender unit.
Also, a loose/corroded connection can lower the working voltage available at the pump, and slow it down.
Hope a filter takes care of it, tho. Big smile

One way to kinda-sorta test for a cracked rubber hose on the pump unit is to fill the tank full. When full, the hose will be covered, so the crack/split would be moot. If the pressure at your gauge goes up with a full tank, then that points to the rubber hose being bad.


|UPDATED|2/10/2015 11:34:23 AM (AZT)|/UPDATED|


____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
2/10/15 5:40pm - Reply: 'Re: Fuel pressure issuses'
crossfire1982
Standard Member
- Send Private Message


Cramerton, NC - USA

Vette(s):
black 1982 coupe slate gray interior, 350 crossfire, 1985 fuel pump, Steeroids R&P conversion

Joined: 8/22/2006
Posts: 1094
Thanks for asking Dave.  Im doing well, just dont bet by the forum as often as I used to.  Still have my 82 and she is running fine.   Hope all my old friends here are doing well.  Ill try to poke my head in a little more often.

____________________________________

Click for a larger image
Save The Wave


 Reply Reply  Quote Reply w/Quote
2/10/15 8:59pm - Reply: 'Re: Fuel pressure issuses'
DaveM Lifetime Member
Lifetime Member
- Send Private Message


Flanders, NJ - USA

Vette(s):
1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

Joined: 1/27/2004
Posts: 2530

Well it looks like I'll have to wait awhile for the weather to get better so I can change the fuel filter. I could put a gage on the rubber hose at the filter when I take off the old one. Can't get out to fill the tank because of snow & salt. I'll keep you up to date.

Thanks guys!



____________________________________
 

Lifetime Member #116
Dave's '82


   
 Reply Reply  Quote Reply w/Quote
4/14/15 6:16pm - Reply: 'Re: Fuel pressure issuses'
DaveM Lifetime Member
Lifetime Member
- Send Private Message


Flanders, NJ - USA

Vette(s):
1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

Joined: 1/27/2004
Posts: 2530
So I changed the fuel filter and set up the carb and all is well, timing is perfect, 15lbs. of vac, mixture right, and idle is set. Thumbs Up We are good to go!!!!!!!!
Dave


____________________________________
 

Lifetime Member #116
Dave's '82


   
 Reply Reply  Quote Reply w/Quote
4/14/15 9:21pm - Reply: 'Re: Fuel pressure issuses'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19454
 Clap Thumbs Up

____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
4/15/15 6:48am - Reply: 'Re: Fuel pressure issuses'
manchestershark Lifetime Member
Lifetime Member
- Send Private Message


Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 1900
ClapThumbs Up    Hoorah!   Now we can travel.

____________________________________

Click on image for full view
 Reply Reply  Quote Reply w/Quote
4/20/15 12:50pm - Reply: 'Re: Fuel pressure issuses'
DaveM Lifetime Member
Lifetime Member
- Send Private Message


Flanders, NJ - USA

Vette(s):
1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

Joined: 1/27/2004
Posts: 2530
Now I need to put new seals in my rear end (the car's that is).
Dave


____________________________________
 

Lifetime Member #116
Dave's '82


   
 Reply Reply  Quote Reply w/Quote
4/20/15 7:06pm - Reply: 'Re: Fuel pressure issuses'
dads2vette Lifetime Member
Lifetime Member
- Send Private Message


Ash Fork, AZ - USA

Vette(s):
1981 Red Interior White exterior

Joined: 4/18/2007
Posts: 1038
DaveM said: Now I need to put new seals in my rear end (the car's that is).
Dave


We've been around you Dave, you might want to do both.

____________________________________
Dave C..........My mantra: I can not be bought!!      Long and short term leases available.
In the words of Zora Arkus-Duntov "Is your seat belt fastened? Alright, Let's go"


Yeah, I know, Shut up Dave.
Lifetime Member #192


 Reply Reply  Quote Reply w/Quote
6/27/15 9:46am - Reply: 'Re: Fuel pressure issuses'
DaveM Lifetime Member
Lifetime Member
- Send Private Message


Flanders, NJ - USA

Vette(s):
1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

Joined: 1/27/2004
Posts: 2530
Turns out the fuel pressure is still at 2psi, so I pulled the fuel pump out of the tank and found that the short hose from the pump to the steel line is split open. I got a new pump with all the new parts to go with it and put it all back together and now I have my 6-7 psi at the carb. Glad I got that done before the gathering, if the hose let loose altogether I would have NO fuel at the carb, not a good thing.


____________________________________
 

Lifetime Member #116
Dave's '82


   
 Reply Reply  Quote Reply w/Quote
 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
 Forums -> C3 Fuel, Emission Control, and Exhaust Systems
(Moderator: Adam Wartell, Norsky, Adams' Apple, kstyer)
 

 
Official C3 Vette Registry Community:
Home | Forums | Email | Who's Online | Clubs | Events | Member Stats

Other Official C3 Vette Registry Areas:
Members | Research | Shop | My Account | About C3VR
 

Corvette is a registered trademark of the General Motors Corporation(GM) & Chevrolet Motor Division. Vette Registries, LLC is responsible for all site content (except for member submitted content or where otherwise noted) and does not claim or imply that Chevrolet or GM is responsible for Official C3 Vette Registry content. Vette Registries, LLC is independent from GM and is not affiliated with, sponsored or supported by GM.  Copyright/trademark/sales mark infringements are not intended, or implied and are in fact used to support GM, Chevrolet and Corvette

Official C3 Vette Registry content is Copyright 2001-2017, Vette Registries, LLC. Content may not be reused without written consent. All Rights Reserved. NS

Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 30