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 22R carb, where does start-up gas squirt come from?
#823863
07/09/07 12:55 AM
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Joined: Jul 2005
Posts: 45
OP
Getting the Wheeling Fever
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Or, does anyone know where I can find a horizontal type carburetor diagram showing the internal fuel passageways. I have one for 1983 Toyota truck carbs, but my truck is a 1984, 22R engine, and my FSM doesn't have it and my Haynes manual spends most of it's energy on EFI and skips the carb passageway diagram it had in previous years.
I'm trying to solve a hard starting problem...takes 15-20 pumps to start after sitting for a few hours. When I look into the primary venturi, and activate the throttle lever, I see a slight wet dribble on the front (front of car) wall of the venturi. This seems to be from a brass tube sticking out a bit...but I don't know if this is the actually start-up gas supply jet, or the accelerator pump jet...or if these are one and the same. I've taken off the accelerator pump diapragm, tried to blow through the small hole on the left side of the accelerator cavity, but no sign of anything coming out into the venturi. Don't know if there is a check ball inside, or if the passage goes somewhere else. But since the engine will start right up with a whiff of starting fluid, it follows that it's not getting enough actual gas to start until the engine has turned over 15-20 times.
Can someone enlighten me on this?
jc
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Re: 22R carb, where does start-up gas squirt come from?
[Re: jbclem]
#823864
07/09/07 01:29 AM
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Joined: Jul 2002
Posts: 1,674
Body Damage is Cool
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That tube is the nozzle for both the Accelerator Pump and the Aux. Accel. Pump. It should give a fairly healthy squirt when you work the pump arm by hand (on the front passenger side of the carb).
The most likely place for blockage is right behind that brass tube, where the passage opens up and transitions from nearly vertical to the tube itself. At the top of the vertical passage there is a chamber that the brass tube connects to, and this chamber is enclosed solely by the gasket between the air horn and the bowl (top two pieces of the carb).
There may be a little bit of gunk in there or the gasket may have just gas soaked and swollen over the years, but either way I'd suggest pulling the top part off the carb and having a looksee. You can do this without removing the carb from the truck as long as you are careful.
First pull the two clips between the choke housing and the carb opening. One connects the choke linkage, the other connects the fuel metering plate (thing that looks like a choke on the secondary barrel). Once those are disconnected, you can undo the 5 phillips head screws that hold the top on (one is down the deep hole between the barrels.
Lift the top plate off carefully, since the pivot for the float and the needle valve aren't really held in by anything, and they are all attached to the underside of the top plate.
Once you have the top off and the gasket out of the way, you'll see what I mean about the chamber (small) behind the tube. I'd take the Accel Pump off again and blast the passages out with carb cleaner again until you get some good flow.
Might want to replace the gasket while you're in there too. I don't remember if you can get that one separate from a rebuild kit other than at the dealer, but I think Napa might have it.
If you want some good exploded diagrams, I'm sure Scerb will chime in soon with his page on carbs. I just forget the link at the moment.
HTH
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Re: 22R carb, where does start-up gas squirt come from?
[Re: stock87]
#823865
07/09/07 02:21 AM
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Joined: Oct 2002
Posts: 15,887
Toyota & Classifieds Moderator
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http://www.walkablecommunities.org/Democracy is two wolves and a lamb voting on what to have for dinner. Liberty is a well-armed lamb contesting the vote. **ubi apis- ibi salus**
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Re: 22R carb, where does start-up gas squirt come from?
[Re: kewlynx]
#823866
07/09/07 05:36 AM
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Joined: Feb 2004
Posts: 1,379
Body Damage is Cool
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Ya, do exactly what stock87 said. Take the top of the carb off and blow all the jets out with carb cleaner. Use the little straw attachment and you can get right in there.
I actually had to do this a few hours ago on my weber - jet clogged up and truck would barely run. You'd be surprised how many sediments you will find in the bottom of the float bowl - soak them all up with a paper towel. This basically does a 15min rebuild of the carb. If you wanna make a project out of it, go ahead and do an actual rebuild.
Just a side note, whenever you go to start the truck (cold, or not so cold.. even hot outa habit) make sure you punch the gas pedal to the floor. This engages the choke and gives it a nice rich mixture for startup. If you are not doing that, then you will be cranking for a while every time, even if no jets are clogged.
-Scerb
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Re: 22R carb, where does start-up gas squirt come from?
[Re: jbclem]
#823867
07/12/07 10:09 AM
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Joined: Jul 2005
Posts: 45
OP
Getting the Wheeling Fever
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I took off the top of the carburater and found the blockage was in the far end of the accelerator pump nozzle (end closest to the front of car) where there is a small orfice. Squirting carb cleaner spray into it wasn't enough, and the hole was smaller than my incomplete set of carb jet reamers...so I used a sewing needle with a bent tip. Even then it took alot of tries but eventually it cleared and the nozzle gives a nice squirt now. I'll know tomorrow if the starting problem is gone, but I'm pretty sure it will be. For now I can say the car accelerates stronger...and I wonder if my gas milleage will get worse because of the increased flow through the accelerator pump nozzle.
The only hard part about removing the carb top was getting one of the linkage arms off, and on. The linkage arm that goes to the secondary side is located in a tight space and there is no room to pull it out from it's attachment point. It took many tries before I found a position where I could detach it...same with the re-attachment. And there was some rust at the bottom of the float chamber, but not much. That's a good sign for the health of my 180,000 miles gas tank.
Thanks to both of you for your help, the suggestions made it much easier.
jc
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Re: 22R carb, where does start-up gas squirt come from?
[Re: jbclem]
#823868
07/12/07 02:09 PM
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Joined: Feb 2004
Posts: 1,379
Body Damage is Cool
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Well done <img src="/forums/images/graemlins/kewl.gif" alt="" />
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Re: 22R carb, where does start-up gas squirt come from?
[Re: Scerb]
#823869
07/13/07 10:00 AM
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Joined: Jul 2005
Posts: 45
OP
Getting the Wheeling Fever
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yep, starts right up now...kicks on the first or second turn.
Now on to the next problem, engine pings.
jc
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Re: 22R carb, where does start-up gas squirt come from?
[Re: stock87]
#823870
07/31/13 05:52 PM
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Joined: May 2013
Posts: 2
Need a Spot
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That tube is the nozzle for both the Accelerator Pump and the Aux. Accel. Pump. It should give a fairly healthy squirt when you work the pump arm by hand (on the front passenger side of the carb).
The most likely place for blockage is right behind that brass tube, where the passage opens up and transitions from nearly vertical to the tube itself. At the top of the vertical passage there is a chamber that the brass tube connects to, and this chamber is enclosed solely by the gasket between the air horn and the bowl (top two pieces of the carb).
There may be a little bit of gunk in there or the gasket may have just gas soaked and swollen over the years, but either way I'd suggest pulling the top part off the carb and having a looksee. You can do this without removing the carb from the truck as long as you are careful.
First pull the two clips between the choke housing and the carb opening. One connects the choke linkage, the other connects the fuel metering plate (thing that looks like a choke on the secondary barrel). Once those are disconnected, you can undo the 5 phillips head screws that hold the top on (one is down the deep hole between the barrels.
Lift the top plate off carefully, since the pivot for the float and the needle valve aren't really held in by anything, and they are all attached to the underside of the top plate.
Once you have the top off and the gasket out of the way, you'll see what I mean about the chamber (small) behind the tube. I'd take the Accel Pump off again and blast the passages out with carb cleaner again until you get some good flow.
Might want to replace the gasket while you're in there too. I don't remember if you can get that one separate from a rebuild kit other than at the dealer, but I think Napa might have it.
If you want some good exploded diagrams, I'm sure Scerb will chime in soon with his page on carbs. I just forget the link at the moment.
HTH Hi, I was hoping you could help me... I have a 1982 toyota PU with a carburetor, and my fuel metering plate mechanical linkage is gone... If I leave the plate to flop open on spring pressure without the external linkage, will it affect my fuel mileage? I heard it is partly vacuum operated. I don't know where the mechanical linkage comes into play.
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Re: 22R carb, where does start-up gas squirt come from?
[Re: tundrawolf]
#823871
08/01/13 02:25 AM
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Joined: Oct 2002
Posts: 15,887
Toyota & Classifieds Moderator
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Gravedigger post. The last entry was 2005.
You'd do better to start a fresh post with your problem.
http://www.walkablecommunities.org/Democracy is two wolves and a lamb voting on what to have for dinner. Liberty is a well-armed lamb contesting the vote. **ubi apis- ibi salus**
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Re: 22R carb, where does start-up gas squirt come from?
[Re: kewlynx]
#823872
08/04/13 09:38 AM
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Joined: Jul 2005
Posts: 45
OP
Getting the Wheeling Fever
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I was just re-reading this thread (I started it 6 years ago) and I tried the link to the carb faq but it was an old link and no good. Could someone direct me to the current location of this carb faq, if it still exists.
Thanks, John
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