My 1985 Base model Pickup with 22R will start but not idle at low speed without stalling. When it was still running well enough to drive, it was running very rough and surging/hesitating badly. My first thought was that it might be the Auxilary Acceleration Pump (AAP) again, which I have replaced twice before. I took it out and the diaphram seemed flexible and could see no damage or holes. I MAY have re-installed it backwards, and that may be when the inability to idle at normal speed started. Today I tried removing it, to be sure it was installed correctly, and that's when things went from bad to worse. First, the spring fell out and after quick seach haven't found it yet. Next, the diaphram was stuck onto the long needle that connects to or is part of the acceleration pump itself, which did not want to come off. After destroying the AAP, the long needle now won't go all the way back in.

I have never rebuilt or replaced a carburetor, but have a friend who can help me. I started looking for different options and was surprised by the quantity of carbs out there that say they are for this model.

Any and all suggestions on brands, new vs. rebuilt, suppliers, and how to be sure the carb I get is the right one for my truck are all requested.





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Arg. I didn't remove the AAP ... I think I removed and destroyed the Choke Breaker! I wondered why I had to use a ratcheting right angle screwdriver before and not this time ...

Have found some carbs with a round plug connector and a square plug connector (for the Automatic Choke connection) Just want to confirm its round on mine? One red wire and several smaller black wires that connect a foot or so away from carb?

 

That would be the round plug.

I bookmarked this site for rebuilt carbs. I have not purchased from them. https://nationalcarburetors.com/Toyo...22R_p_563.html

I had a very bad experience purchasing from "Carburetor Exchange" out of California. What I ordered matched the specs for my truck. What I received didn't have the same number of vacuum ports as my original. The guy at Carburetor Exchange gave me a really hard time when I called to tell him what I received wasn't a fit. He finally agreed to send me another one. When I asked for him to send me pics of the carb from all sides, he said he wouldn't do that and that the carb would be correct. The second one wasn't right either. I had another hassle getting him to refund my money. I had to pay return shipping. I would not recommend them unless you could walk in with your old carb and match it to what he has available.

I ended up rebuilding my carb. Rebuilding a carb isn't that hard. Rebuild kits are available on Rockauto and if I remember correctly include the choke breaker part.

If you buy a rebuilt one be sure to compare pics to your carb from all sides.

 

Thanks prcnctoyo for the link to National Carburetor. I had come across the same website in my search after submitting my questions. With so many places offering new carbs for around $100 or less, it is difficult to know which ones are any good. Anyone with positive or negative feedback about any other carburetor rebuild service or new aftermarket carburetors for a 1985 22R would be greatly appreciated.

 

From what I have seen, the "$100" carbs on Ebay and elsewhere are Chinese made knockoffs of the original OEM Aisin carbs. I would avoid these. Fit, finish and function on most chinese made carbs are never very good. It may run the engine, but not well, and you'll come up with problems later that you can't solve. I've seen tons of stories about how they just can't get the tuning right with one of those.

I've dealt with National Carb before and have always had a positive experience. I will qualify this by saying what I've dealt with are their rebuilds of original OEM carbs. They are always completely done, including new throttle shaft bushings in the base, which some rebuilders just don't bother to do.
I qualified my statement because now I see that they are also offering NEW carbs for this application:
https://nationalcarburetors.com/toyo...arburetor_1985

But I've never ordered or used one of those before, so I can't speak to them on experience. They do look nice but that's about all I can say on that.
The carb I got from National 5+ years ago is still working fine on my "78 20R. Only issue I had with it was one of the top bowl cover screws came a little loose and causes a slight fuel leak; fixed 5 seconds later with a screwdriver to tighten up the screw.
Carb tuned out fine, runs fine, and is giving me 22 to 24 MPG city in my '78 longbed.

 

Thank you 13Swords for your info about your experiences. I had seen the TOY505-NEW also and was curious if it is really made by Aisan, like National Carburetor's website says. All National Carburetor could tell me was "The new ones that were we carry are aftermarket Chinese carburetors." All of the info I have gotten from National Carburetor has been pretty short and tight lipped.

Looking as Aisan's website, they do have manufacturing facilities in China, even though Aisan seems to be a Japanese company. In which case, National Carburetor's webpage and the email I received could both be correct. I have sent an email to Aisan asking them for clarification, but no answer yet.

Still trying to decide between spending less than $100 or over $400, so could use more data points from anyone else who has replaced their carburetor for this model (or close to this model) truck, either new or rebuilt.

 

You're welcome. After doing some checking around and some research, the "sub $100" carb on Ebay and other places is the same unit that National is selling under part # TOY505-NEW. The only difference I see is that National has stamped their logo into the upper vertical flange. I can understand why they don't want to talk about it's origin, especially in today's social and economic climate. And if anyone like me finds out that it's the same unit, they are going to have a hard time explaining why they want $160 more for theirs.

Just to be clear, my opinion on chinese made carbs mostly comes from the past 8-10 years of answering questions from people who were having a hard time with "Weber" 32/36 carbs. For the most part, they were not actual Webers (made in Spain) but chinese knockoffs being sold as genuine Webers on Ebay and elsewhere. I've become an expert on spotting these.
It was always the same story; fit & finish poor, material quality poor, function mid but tuning problems arose that could not be solved. So that's why I recommend, no matter the "branding", to avoid chinese made carbs. They just don't seem to be very careful with their manufacturing processes. Carbs are meant to be precision instruments that function in a very hostile environment, for year upon year. Sloppy tolerances and workmanship won't make that happen, and you end up with a poorly running vehicle that you can't make function on a "normal" basis.

The rebuilt carbs from national use OEM Aisin carb bodies (cores), and National's rebuild standards have been, IMO, always very good. They flow test every rebuild to make sure it's functioning right before they ship it out. Considering how many times I've heard about someone getting one of their rebuilds and it working great, plus my own experience, tends to make me believe that their rebuild quality is very good.

Aisin is a Japanese company with an 80 year history. More info here: https://www.aisin.com/en/profile/history/
They have been a large supplier of parts for many Japanese automakers over the years, and their reputation for quality has been excellent. But like every other big company during the last 30 years or so, with globalization demand for lower pricing and of course, with an eye towards profits, they have also gone into China for some production. I doubt they are behind the "sub $100" version IMO.

Not sure why you'd be spending over $400. The rebuilt carb is $280 plus $50 core charge, which you get back when you send them your old carb, plus shipping costs Even if it were close to the $400 mark, and you were going to keep the truck a while, I say it's worth doing, and to avoid any hassles about low quality carb problems.

You could also consider a Weber 32/36 from Redline, but it has it's own special "quirks" to deal with, and would likely cost just as much or more.

 

Thanks for all of the comments, suggestions, and recommendations. I considered National Carburetors, but then came across another company called Guaranteed Carburetors and used them. The total cost was about $100 less than what National Carburetor would have charged to rebuild and return my original carb. The turnaround time was fairly quick (estimated to be 2 weeks) and was in their shop for about a week once they received it. After re-installing it, the truck ran great for my first test drive. But, then the same symptoms I had before returned, with engine "bucking". After ruling out possible fuel line deterioration issue and replacing all 1/8" ID vacuum tubing, issue was finally diagnosed as a faulty spark plug wire and a new set of wires installed. Have driven a few times since and carb seems to be working great. Overall experience was good, and I was able to return base gaskets (one of which didn't match my insulator plate) for a refund. I wound up making my own gaskets for about the same cost ($9). Some rebuild kits come with the gasket I needed, but apparently not the rebuild kit which Guaranteed Carburetors uses.






Gaskets as received from Guaranteed Carburetor

Gaskets I made, comapred to those received from Guaranteed Carburetor

 

Glad you got it worked out and running well. Nice work.