Rochester 1 Barrel Carbs Problem....no squirt

Not a quote, just my memory. I wasn't going to get involved in this thread because a lot of members don't care for the "B", & I didn't want to get into a keyboard fight.
I get the leather pumps from salvaged cores, as well as the steel needle/seat ass'y . I keep the pumps in a bottle of neat's foot oil after dressing any flaw with emery board. Before installing I use a ball hone lubed with water in the barrel.
The early & late pump arm assy's interchange, but the later air horn must be used. Then, adjust the pump stroke by bending the link if needed.
I won't cover straightening air horns or fuel bowls - someone could get hurt.

 

To all , like all of us if I have something that is not working correctly I am too anal sometimes about fixing it , often throwing good $ after bad , because it “fits” or it is already bolt on . In my case this amplified because in Michigan I have a shelf full of 1and 2 early barrel CHEVY carburetors. ( Ford/ stromburg also ). While I will continue to work on this carburetor I am also going to find a “new” one while here in Florida.
I can NOT thank you all enough
Dan

 

Dan - the used pump is the original leather, and is too far gone to rejuvenate. The other one is a modern imitation. I would suggest trying to find either a good used leather pump (see the post above by 302GMC) or a new leather pump from one of the better rebuilding kits. A good used one can be rejuvenated by soaking in a light machine oil.

The fuel valve is described here: https://www.thecarburetorshop.com/Fuel_valves.htm

Jon.

 

Hello , this is the back side of the part that goes from between the exhaust/intake manifolds up to the Rochester B carb I have . I am assuming that the spring that that is mostly missing holds the choke closed until engine warms up .
Can someone tell me what it is called and where I may find a replacement spring coil ?
Thanks Dan

 

If anyone is interested for future reference
Thanks !!!

 

Sorry to bring this post back from the dead, but I'm facing the same 'no squirt' issue from the accelerator pump. Disclaimer that I've watched and read everything from Mike's Carburetor's that I could find on this, and this is my first time taking apart a carb.

My carb is the Rochester BC on a 1953 Bel Air. I just replaced the accelerator pump and it's still not spraying so I assume I'm having a similar issue to the OP. The bore for the accelerator pump has what appear to be two ports on the bottom. The one exit port that goes to the other check ball/spring and to the venturi where the gas is supposed to shoot out. The exit port works great and I've tested it with the accelerator pump and my finger over the hole where the T goes and the gas shoots out the venturi as it should.

What I thought was an intake port seems to be plugged (maybe on purpose?). I can fit a paperclip through the exit port, but intake seems to be blocked off. Given this, how is the gas supposed to enter into the accelerator pump bore? Could this be one of the 'spill over' versions where the gas spills into the accelerator bore from the bowl or the carb?

Given what I thought was an gas inlet hole at the bottom of the accelerator pump bore actually isn't, and assuming that gas is supposed to 'spill over' into the accelerator pump bore, could I simply be having an issue where my float is not set correctly and isn't allowing gas to build up high enough in the carb to spill into the accelerator pump bore? Or, like the OP, am I supposed to have another check ball somewhere in this?

Thanks for any insight!

 

It may well be a "spill over" type fill. The two holes you can see in the bottom of the pump bore are directly "in line" with each other. If you consider how the holes need to be drilled through the carburetor during manufacturing, it will become obvious that the one towards the outside of the carburetor is there simply as a left over hole that allowed the drill bit to go through the pump chamber in order to drill from the chamber into the vertical port where the ball and spring are located. There will be a lead plug in the hole that leads from the chamber to the outside of the carb.

I'll tag @carbking. He'll know for sure how the pump chamber fills with fuel.

 

Thanks for the info @Ebbsspeed , that makes total sense on what I thought was an intake hole. I checked it last night and you can see where the hole into the accelerator bore was drilled and then closed up on the outside.

At this stage I'm leaning towards the accelerator pump issue being related to a lack of fuel coming into the accelerator pump bore. I replaced the accelerator pump with one of the ones from @carbking, and when I do the same bench test that he does in the video the pump seems to be working fine, making a strong stream of fuel into the throat of the carb. I checked my float level and drop last night and it was marginally off. I have it bang on now, and otherwise things seem to be working as they should on the carb. Could this have just been a float level issue all along? I could absolutely be missing something else, this is my first time diving into a carb.

Here is a video of the bogging on fast acceleration (slow works fine), and another video showing nothing coming out of the venturi into the carb. I know I've got a lot of valvetrain noise...hoping to do the timing and lash this weekend.



https://youtube.com/shorts/76CfPbio638?si=-dy2qpYbvuaAfS1B

 

Just sharing an FYI that it turns out that it was the float level that was affecting the accelerator pump. The floats were slightly out of adjustment--this prevented the fuel level from getting high enough in the carb to spill over into the bore of the accelerator pump. Adjusted the floats to spec and it shoot out fuel from the hole as it should.