| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,075 Posts1,055,918 Members48,429 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | 
#78114 05/27/2007 9:57 PM | Joined: Dec 2002 Posts: 127 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2002 Posts: 127 | i have a 54 chevy with a 235. i have a holley 4 barrel 390 on it. it has been having problems starting up lately, like it is getting no gas. and it is idling really bad. it also has black smoke coming out of the tailpipes. so i took the air cleaner off, and the secondaries were leaking gas. i dont know what its called, but on top of the secondaries where the gas comes out, has a steady drip of gas going into the carb. i dont know how to fix this or what i should do. any help would be great, thanks | | |
#78115 05/27/2007 10:01 PM | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | The first thing that comes to mind is the float level is too high, or possibly the float is bad. This will allow exess fuel in the bowl. You'll need to get the correct specs for that carb to reset the float to proper level.
Bill Burmeister
| | |
#78116 05/28/2007 12:06 AM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | If it has the external adjustable floats you can remove the needle & seats & clean them. Then adjust the float level till the fuel is at the bottom of the plug holes on the side. It could have a bad power valve also. If you are going to run one of those you need to read up on them so you can repair it yourself.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
#78117 05/28/2007 12:23 AM | Joined: Mar 2004 Posts: 3,068 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 3,068 | I agree on the junk on the seat, it doesn't take much to hold up the needle and seat on those Holley's. I used to keep a spare set in my glove box when I was foolishly running a Holley. I've learned to hate those darn carbs, they run different everytime you run them,
Scott | | |
#78118 06/04/2007 4:05 AM | Joined: Dec 2002 Posts: 127 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2002 Posts: 127 | ok, so i found out, the float was way to high, gas poured out the hole when i opened it. so now i have lowered the level. i now want to re-tune the entire carb, such as idle, air-fuel mixture screws. what is the general setting for them? i know its something like tighten and then loosen 3.5 turns. but i dont know the exact amount of turns to go, and where all the adjustment screws are located. any help would be great! thanks again! | | |
#78119 06/04/2007 8:58 PM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | The idle mixture screws are on the side of the primary fuel bowl. One side is close to that fuel level plug. With the engine idleing turn each screw in slowly till the engine starts to slow down. Then back it out enough go back to the faster idle, about 1/4 turn. Then adjust your idle speed to about 600 rpm if you have a tach. or about 750 if is auto trans. If you don,t have a tach set it where it sounds good & is comfortable.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
#78120 06/05/2007 2:23 AM | Joined: Jul 2005 Posts: 27 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2005 Posts: 27 | 48bigtrucks said: when I was foolishly running a Holley. I've learned to hate those darn carbs, they run different everytime you run them, Amen Brother!!!
Insert clever statement here:
| | |
|
|
| |
