Small Sight Glass 1bbl Carb fuel float sticking?

[BTUMAN]

On the carb for my 57, I recently started to experience the carb fuel delivery not able to keep up.

Here is the scenario:

Both carb and fuel pump rebuilt in restoration. Probably driven and run for 6 hours since rebuild. All was well.

Now I can hand prime and get 3/4 full. Start it up and it will fun for 10 min or maybe 2 min before the fuel in he sight glass starts to go down.

I tried to gently tap the carb to see if float was sticking (and would drop). Didn't help.

I'm thinking a piece of trash in the jet or float sticking? I know Mark and others are experts here- I did leave message with Mark but know he is busy.

The fuel punp works correct(made sure lines were clear). Base on date code I think it is a 1960 Dec 15 build. (0L15). I also checked on the solenoid and it is getting power on switch and stays on (Amp Meter left on during condition)

If it gets low- I can turn off motor then restart and it will sort of fill up more than it had before.

Anyone experience something similar that I can lean on before opening it up?

 

[Cruiser_Nerd]

If I recall there is a screen above the needle and seat (plug above inlet). Next pop off the top to see if the seat is clear.

 

[Splangy]

It was probably a replacement carb made in 1970 since it has a solenoid. Are you sure your fuel pump is working right? They can sometimes pump some fuel, but not enough.

 

[tahoe40/45]

Where are pictures of the rest of this 57?

 

[BTUMAN]

It was probably a replacement carb made in 1970 since it has a solenoid. Are you sure your fuel pump is working right? They can sometimes pump some fuel, but not enough.

Good Point @Splangy . I can hand pump it fine and it fills the sight glass. I took off the piping at the fuel pump and had my son crank it for just a second (with rags ready). I was getting fuel for sure. Is there a way to really test that?

 

[BTUMAN]

Where are pictures of the rest of this 57?

What...this old thing..

 

[BTUMAN]

It was probably a replacement carb made in 1970 since it has a solenoid. Are you sure your fuel pump is working right? They can sometimes pump some fuel, but not enough.

I was thinking that, but a thread said the small sight glass ended in 69. I think it is junk in carb as the fuel filter looks dirty.

I ran the tank dry and the restorer did not boil the tank to clean (after I discussed it with him). I may have to take tank off . I hear you can take to radiator shop and they can boil it clean?

 

[tahoe40/45]

I was thinking that, but a thread said the small sight glass ended in 69. I think it is junk in carb as the fuel filter looks dirty.

I ran the tank dry and the restorer did not boil the tank to clean (after I discussed it with him). I may have to take tank off . I hear you can take to radiator shop and they can boil it clean?

Yes you can. I have taken lots of gas tanks to the radiator shop for cleaning and repairs.

 

[tahoe40/45]

What...this old thing..

View attachment 1345462

View attachment 1345463

View attachment 1345464

View attachment 1345465

Nice, so thats where that one went. Really cool, congrats. Thanks for the photos.

 

[Old Red]

I don't know the fix for your current fuel issues. But treeroot's thread is certainly the most comprehensive examination available of the carburetor that should be on your 25, when you get a chance: Aisan SD40 Big Window Carburetor

 

[Splangy]

I was thinking that, but a thread said the small sight glass ended in 69. I think it is junk in carb as the fuel filter looks dirty.

I ran the tank dry and the restorer did not boil the tank to clean (after I discussed it with him). I may have to take tank off . I hear you can take to radiator shop and they can boil it clean?

Toyota continued to make replacement carburetors for years.

 

[Landpimp]

I got the last new small window from Marv 13 years ago, not sure how long it was sitting around.

I had good luck doing an okie rebuild on a carb with some junk in it.

 

[65swb45]

I got the last new small window from Marv 13 years ago, not sure how long it was sitting around.

it.

He told you it was the last one?

 

[65swb45]

BTU

That rig deserves a period-correct blue tag large window carb. Rebuilt, fully detailed, with NOS air cleaner gasket. $800.00

 

[BTUMAN]

Pretty sure my carb is fine- the fuel pump the current suspect.

What is the date code on that blue tag? Tell me the story on that one? Did you go with a more modeling one?

 

[BTUMAN]

Pretty sure my carb is fine- the fuel pump the current suspect.

What is the date code on that blue tag? Tell me the story on that one? Did you go with a more modeling one?

Mark- PM you my cell. Can you call me?

 

[BTUMAN]

BTU

That rig deserves a period-correct blue tag large window carb. Rebuilt, fully detailed, with NOS air cleaner gasket. $800.00
View attachment 1347372

Could not resist such a beauty. Thanks Mark. It's going on now. Although we found the issue with the fuel (homemade fuel line inlet jet that restricted flow- missed in restoration since it was hidden)- I still wanted the original period correct style carb.

Question for all who are familiar- there is no "Spring" on the carb body linkages throttle for it to return to idle. On the 25's was that spring in the main linkages? Scratching my head....

 

[pardion]

The spring in the linkage is actually 2 springs, part Y in the photo, You might want to acquire

one of these parts manuals, I am more than happy to look up parts. John

 

[BTUMAN]

Thanks. What a great resource! That Blue Face looks so bad arse on this thing....tweaking a few more things like hose clamps, etc to get her closer...wire covers, etc.