The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1947 - 1959 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 08-17-2017, 04:30 PM   #1
jabos
Registered User
 
Join Date: Feb 2015
Location: greer sc
Posts: 72
Carb issues?

The truck is a 51 chevy with a 1961 235 1 barrel Rochester. I started it up today and ran it for about 25 minutes and then it died and I went to start it up and the air cleaner blew off and the i tried it again and my son said gas blew out of the top of the carb, it looked like old faithful he said. So I am not sure what would cause that. I have been thinking I need a new carb anyways. Thanks, Jason
jabos is offline   Reply With Quote
Old 08-17-2017, 04:58 PM   #2
Wrenchbender Ret
Registered User
 
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,190
Re: Carb issues?

You have dirt in the needle & seat or the float has a hole in it letting gas fill in.
Wrenchbender Ret is offline   Reply With Quote
Old 08-17-2017, 06:00 PM   #3
jabos
Registered User
 
Join Date: Feb 2015
Location: greer sc
Posts: 72
Re: Carb issues?

Thanks for the reply I will check on that
jabos is offline   Reply With Quote
Old 08-17-2017, 06:44 PM   #4
my56chevytruck
Registered User
 
my56chevytruck's Avatar
 
Join Date: Feb 2016
Location: Hebron
Posts: 1,117
Re: Carb issues?

yes, as wrenchbender has said, your needle & seat is somehow stuck not allowing the gas to flow thru. a simple carb removal and possible carb spray out may do it, but if not, have someone take the carb apart and clean it completely.
__________________
RUBBER DOWN AND HIT THE ROAD!!!
1940 Ford Dlx Coupe
1969 Mach1
my56chevytruck is offline   Reply With Quote
Old 08-17-2017, 10:33 PM   #5
Foot Stomper
Registered User
 
Foot Stomper's Avatar
 
Join Date: Oct 2015
Location: Calgary, Alberta
Posts: 1,252
Re: Carb issues?

I found this YouTube video very helpful and extremely detailed. It's 45 minutes long but absolutely PACKED with great advice and instruction.

https://www.youtube.com/watch?v=V2AINKEauVM
__________________
So when is this "Old enough to know better" supposed to kick in?

My 1959 GMC build thread http://67-72chevytrucks.com/vboard/s...d.php?t=686989
Foot Stomper is offline   Reply With Quote
Old 08-20-2017, 02:35 AM   #6
tmoble
Registered User
 
Join Date: Feb 2009
Location: Glendale, Az
Posts: 1,062
Re: Carb issues?

really? backfires are caused by carbs running over? new one on me.

hint: carbs running over don't cause sparks in the intake manifold. sparks in the intake are caused by ignition problems like closed up points or carbon track in the distributor cap. They can also be caused by extremely lean mixtures like no choke on a cold start. in this case the flame in the chamber burns so slow that it's still burning when the intake valve opens next time around.

In general, most carb problems usually end up being ignition problems.
tmoble is offline   Reply With Quote
Old 08-23-2017, 03:50 PM   #7
jabos
Registered User
 
Join Date: Feb 2015
Location: greer sc
Posts: 72
Re: Carb issues?

I had the carb cleaned and rebuilt and it does run better and no more geysers coming out of the carb but it still seems to lack power when the engine is under load. When it is in first gear and I take off it will go but not with much power. What are your thoughts on this?
jabos is offline   Reply With Quote
Old 08-24-2017, 04:27 PM   #8
Wrenchbender Ret
Registered User
 
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,190
Re: Carb issues?

Tmoble has some good ideas. The timing may be slow. Check & see if the points aren't hardly breaking.
Wrenchbender Ret is offline   Reply With Quote
Old 08-25-2017, 08:23 PM   #9
jabos
Registered User
 
Join Date: Feb 2015
Location: greer sc
Posts: 72
Re: Carb issues?

I put a new cap on it and I did move the distributor a little to the right and it does seem to have more power but not quite like it should. Could my distributor be bad? I dont know to much about them.
jabos is offline   Reply With Quote
Old 08-30-2017, 06:28 AM   #10
jabos
Registered User
 
Join Date: Feb 2015
Location: greer sc
Posts: 72
Re: Carb issues?

I did adjust the distributor a little more to the right and the 235 is running really good in my opinion, it seems to have the power it should. Thank you guys for all your help, you guys are a lot of help and I really appreciate it.
jabos is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Forum Jump


All times are GMT -4. The time now is 04:51 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com