Rock10

Kinda out of my price range. My piece is clean, just has crap stuck in a small tube. I thought the ultrasonic might shake it loose.

It was decades ago. The stupidity of youth.

I've used some paint thinner, but lacquer thinner is a bit stronger.

I don't think the problem is varnish. I think the crud left by the ethanol and possibly the assembly stuff left in our new fuel pump ended up stuck in there when the fuel evaporated. Maybe throw in a few tiny rust particles. Then I tried to blow it out with compressed air and jammed it in those little tubes.

https://www.lowes.com/pd/Jasco-128-fl-oz-Fast-to-Dissolve-Methyl-Ethyl-Ketone-MEK/1000508687 Well Lowes has this. It ain't cheap.

Back in the day we would just pour it on a rag and wipe down the car after wet sanding.

My brother had a 66 Vette with a 427 in it. I think it had a performance pressure plate and clutch. It took so much effort to push it in and hold it in that at stop lights, my leg was shaking.

Has anyone used an ultrasonic cleaner on a carb? What size would it be? What cleaning solution? Thanks

Would that hurt the carb? I was tempted to leave it in the carb dip overnight, but it warns that some carbs may be damaged. Don't want to destroy it just yet.

Well, I soaked it in carb dip twice, soaked it in solvent, soaked it in hot soapy water, used a shop vac to try to suck the blockage out and I still only have a small trickle out on one side under pressure.My guess is the blockage is in the little copper/brass tubes. Would an ultrasonic cleaner dislodge stuff stuck in there?

How does it feel catching from off the floor?

I have a small wire, just can't get it in anywhere.

No. I may have to look up a price.

I won't remove them. I think I'll try a soak in carb cleaner first.

No, #31 is right up against the venturi. I might have to buy a bucket of carb cleaner and let it soak. The power valve is out and I've tried to pack the well a blow compressed air in. It just blows the packing out. I wouldn't think there would be any major constriction there so I guess it must be clogged with something. There was some grainy like substance around the power valve and in the well when I took it apart. The car had sat for 3-4 weeks this summer while we changed the torque ball seal. I wonder if there was water in the carb that evaporated and left the crud. I don't know.

# 28 is working OK. #29 is questionable but not in the carb right now. #30 and #31 seem to be my problem. And I see no way of checking/cleaning that passage. As you can see, when the plunger goes down there should be nothing stopping the gas from coming out.

When testing earlier, the gas would slip past the plunger and splash into the float bowl through the slot pont35cpe mentioned before.

Well that's a test I won't have to do. The little check ball in the bottom is working OK. When I blow in the well, nothing comes out in the float bowl.

There is a well below the power valve that should always hold fuel. There appear to be 2 holes in the thread area that probably lead to the discharge tube for the pump. I can't get a good look at those or get anything in them due to the small space. When I plug the well with a paper towel wrapped around a piece of vacuum hose I can blow down into the threaded area. The air should come out the discharge tubes. It doesn't.

It is in the bottom of the bowl. It lets fuel in and then blocks the back flow when the pump is working. I've checked the check ball. It is working OK. I think you have it right on the power valve. It stays open as long as your foot's down. I think I have a blockage in the passages going to the carb throat from the pump cavity, but I need to try pont35cpe's suggestion first. I'm not getting the little squirt you need when you give it a little gas.

The pump and power valve are meant to cover short time periods. In normal operation while changing engine speeds, the pump would move very little and squirt the necessary fuel allowing the well to refill when you lifted your foot. In a WOT situation, the plunger pushes all the way down on the power valve allowing a big shot of fuel to pass into the carb until the jets catch up. This is my simple understanding. I will try again with the float bowl full. Thanks pont35cpe

I would appreciate any ideas. Like I said, it worked fine and now I can't seem to get anything to squirt. Thanks

Are those tubes removable?

No gaskets right now. Just the bowl section of the carb sitting in a pan. Again, this was working fine. The car has set a few weeks between running from time to time. Not sure when the problem actually started.