400 sb carburetor problems - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 08-12-2009, 05:10 PM
Registered User
 

Last journal entry: chevy short wide
Last photo:
Join Date: Aug 2009
Location: sulphur springs texas
Posts: 17
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
400 sb carburetor problems

1981 chevy short wide with a 400 small block. i bought the truck and it had been sitting up for a good while with a holley carburetor. so i went ahead and bought a new carb it is a edelbrock 650 manual choke carb it has the break compresser hook up in the back the timing vacuum in the front left, pcv in the fron middle and manifold vacuum on front right.,the truck will crank how i have it but will die soon as it cranks any ideas i need help thanks

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 08-12-2009, 06:08 PM
Member
 
Last photo:
Join Date: Feb 2004
Location: N Ga.
Posts: 272
Wiki Edits: 0

Thanks: 3
Thanked 5 Times in 5 Posts
Vacuum leak? Will It run with choke "on"?
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 08-12-2009, 06:47 PM
Saitek5678
 
Join Date: Aug 2009
Location: Rochester. MN
Age: 52
Posts: 94
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
saitek5678

Plug off all vacuum at the carb, and all other vacuum at the intake, make sure the engine is dry, not flooded, no wet gas anywhere, GOT SPARK? check that, With ckoke full open, gas peddle too the floor, crank if it fires , hold it there untill you clear the flood condition,let off slowly so you don't wreck it. If not put choke to full close, pump the peddle once or twice, make sure the accell pump is working, if it starts open the choke instantly to about an eighth open, engine lurching is too much gas, engine smooth then fade and die is not enough gas. Full choke is Floods all day, Wide open choke is the land of the Dry people. The choke is only operational on cold start, when the engine is warm (operating temp) its always wide open. Hope this helps!
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 08-12-2009, 10:33 PM
Registered User
 

Last journal entry: chevy short wide
Last photo:
Join Date: Aug 2009
Location: sulphur springs texas
Posts: 17
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
carb problems

yes the truck will only crank with choke on and will stay running with choke on longer than it will if you kill the choke but it will still dies ........ are all of the hook ups on the carb suppose to be in use or do some of them just need to be capped off
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 08-12-2009, 11:09 PM
Saitek5678
 
Join Date: Aug 2009
Location: Rochester. MN
Age: 52
Posts: 94
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
saitek5678

To get to the problem cap off ALL the vacuum at the carb OK , Now ALL the vacuum at the manifold (intake). All the vacuum lines are for SECONDARY systems and the engine will run without them. Trust me! Before you try to start the engine, get up and look direct into the carb, choke wide open and turn the accelertor or butterflies open, do you see gas spray , like a squirt gun down the ports? if so good, If not the new carb is not filling with gas and suspect a bad fuel pump. or plugged fuel filter.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 08-13-2009, 07:36 AM
Registered User
 

Last journal entry: chevy short wide
Last photo:
Join Date: Aug 2009
Location: sulphur springs texas
Posts: 17
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
81

alright i will try that today and i will get back to you and tell you how it goes thanks for the info.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 08-13-2009, 01:07 PM
Registered User
 

Last journal entry: chevy short wide
Last photo:
Join Date: Aug 2009
Location: sulphur springs texas
Posts: 17
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
400 sb

i finally got the truck to where it will sit and idle with the choke completly off, but now when you press the gas it will just die
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 08-13-2009, 09:59 PM
Saitek5678
 
Join Date: Aug 2009
Location: Rochester. MN
Age: 52
Posts: 94
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
saitek5678

Off?, meaning wide open choke? That is what off choke referes to. OK. try putting the choke at just very partial open and see how the engine reacts. It sounds like your not getting enough fuel to the carb, again, check fuel pump and fuel filter. Let me know my freind.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 08-16-2009, 07:19 PM
Roadkill58's Avatar
Rust Never Sleeps
 

Last journal entry: Step notch
Last photo:
Join Date: Oct 2008
Location: North Kalifornia
Posts: 10
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Are you using a stock manifold. eldelbrock suggest (insist) you need an adaptor for the square bore (performer) carburetor. While idling spray some carburetor cleaner around the base of the carb. If idle goes up you have a leak.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 08-30-2009, 09:16 PM
Registered User
 

Last journal entry: chevy short wide
Last photo:
Join Date: Aug 2009
Location: sulphur springs texas
Posts: 17
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
wrong again

well went and fooled around with the old truck... seems like i was kinda in the wrong direction turned out that i just had a bad hose running from the tank to the fuel pump causing it to not get enough fuel ha who would have thought
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Aluminum Corvette heads on SB 400 Tymer Engine 12 07-28-2008 12:28 PM
Good recipe for a 500 hp sb 400 chevy Littlered wagon Engine 25 01-31-2005 08:05 PM
400 sb? Silentlion_69 Hotrodders' Lounge 2 03-04-2004 04:18 PM
400 sb heads randyjrc123 Engine 13 02-04-2004 02:41 PM
Horesower for a 78 Chevy SB 400 sciaretta1250 Engine 3 11-14-2002 09:43 PM


All times are GMT -6. The time now is 03:18 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.