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OT: Buick carb

S

Slowpoke

Well-known Member
How does one remove the top of a 79 Buick Regal 4 bbl carb? The pump rod and a choke rod on the opposite side of the carb go down the sides and I see no way to pull the top off.
The problem is the engine will only run with spurts of engine starter spray. The fuel pump has been replaced. The filter is new and very hard to blow thru as are the new ones at the store. When I loosened the top of the carb, plenty of fuel ran over the sides at the bowl. Can it be a stuck shut float valve?
Thanks for your assistance.
Slowpoke
 
Rochester on 305 Buick vin H.
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take a small punch and drive the pin on the accelerator pump pivot in towards the center but make sure there is room to get a screwdriver behind it so you can pry it back out.

Do not break the pivot off.
 
Just remove the screw on the choke valve crank. There are two hidden screws under the choke valve.
Also push in the accellerator pump pivot pin just enough to clear the arm. Between the big secondary air valve are the secondary rods and their hanger; remove that too.
 
Spent (wasted) many of my younger years specializing in Quadrajets. Not exactly for the faint of heart. At least you don't have an electric one. You say when you got the top loose fuel came out but it will only run on carb spray. Are you sure there is actually gas in the carb and not something like diesel (seen it before)? Assuming the engine hasn't run but in spurts I would think the choke should be "slammed" shut unless you propped it open for the photo. There is the slim chance that the primary metering rods are stuck down (shouldn't effect idle) but they can be checked theough the bowl vent. did i mention that I hate those things? Not worth the effort you have to put in to get them running perfect IMHO.
 
(quoted from post at 03:22:06 03/29/14) take a small punch and drive the pin on the accelerator pump pivot in towards the center but make sure there is room to get a screwdriver behind it so you can pry it back out.

Do not break the pivot off.
Click to expand...

Whut he said and thank god for EFI... I hope I never have to work under the hood of one of those hoods again... Emission controls made it a bear to work on... It may be the only one in captivity...
 
Had 78 ford pickup carb Got fuel filter/ got 78 Parts guy says It's correct. 78 had change in mid year, the filter was for late model. Got filter for 77 ran well
 
This is apparently the opposite of your problem, but the Q Jets had a composition float. Occasionally one would "sink", or lose it's floatation. That would cause an overabundance of fuel in the carb.
 
You might also try checking a Buick web site for that info. Riviera Owners Association is one, another is "The Bombsight" (named after the Buick hood ornaments with the cross hairs).
 
Take it off the intake. Throw it in the scrap iron pile and buy a Edelbrock performer. You'll be glad you did. It'll wake that 305 UP !!!
 
I've seen generic replacement carbs in the Summit Racing catalog that cost little more than a rebuilt kit and parts for an old Rochester.
 
Purchase a kit, and new brass float (assuming Napa can get new brass floats). I have fought those quadrajets many times until I took a carb to someone that knew what he was doing. He told me there was nothing wrong with my carb rebuild, except for a sunken float. He told me the biggest reason those are tossed, are the fiber floats which soak up fuel, and sink slowly, and if you replace with a brass float, that will be the last time you worry about the float. I know others will disagree, but I learned the hard way they are decent carbs, biggest problem is the person working or tinkering on them. Another tip.....do not change any adjustments other than the two screws on lower front....if I recall, turn the screws in until it stumbles, then back it out about 1/4 turn. Going by memory, and it has been many years since I worked on one, but I only owned one Holley, but would not be afraid to own another quadrajet (actually I own a car with an electronic quadrajet, and I am likely going to rebuild this year). I do agree I am glad for efi.
 
From the begining: no start condition after 2 weeks of non use... Gas gauge registered 1/2 tank, no fuel out the fuel line at the carb thru a tube into a container. The filter was hard to blow thru so I removed it. I went for a new pump and filter, came back and the container now had 3/4 pint of gas in it!?? I used starter fluid to run engine for a few seconds (still with old fuel pump) and gas flowed into the container like a fire hose. I put the new filter in and reconnected the fuel line to the carb. Still won't run except with spurts of starter fluid. Added 5 gal fresh gas. Now gauge reads 3/4 full. Installed the new pump, still won't run at idle or any position of accelerator.
When I removed all screws on the carb perimeter and loosened the two under the choke, fuel came flowing out and the top popped up about 3/16 above the base. Normally, the choke is open about a 1/4". (Temperature was about 70*.)
Next step is to get the top off and see why a no start condition occurs even with fuel in the bowl..
BTW, It's not my '79 Buick /305. It belongs to an 87 yo friend.
 
Just like DavidG said. Take a small drift punch and drive the roll pin toward the air horn enough to get the pump arm off. Then the top will come off. Turn the top 90 degrees to get the rod off on the other side. Allot of people hate the Quadrajet carb. I personally have thrown many a Holly and Carter away and put the QJ in their spot and had great luck. I like them. The small primary makes great low throttle response and as long as you don't set the secondary air doors too loose they transition into those large secondary's nice and smooth without loosing so much manifold vacuum that they stumble during the transition. Just me.

Greg
 
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