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carburator float chamber gas level drops...then hard start #822688 07/03/07 12:47 AM
Joined: Jul 2005
Posts: 45
J
jbclem Offline OP
Getting the Wheeling Fever
1984 Toyota Pickup...22R engine. When the engine is running, the float chamber gas level is correct-right in between the two lines. After it's been turned off for a few hours, the float chamber gas level drops down to the bottom level of the sight glass and the engine takes 15-20 turns to start. What could be causing this to happen...any ideas?

jc

From the Off-Road World
Re: carburator float chamber gas level drops...then hard start [Re: jbclem] #822689 07/03/07 02:02 AM
Joined: Oct 2002
Posts: 15,887
kewlynx Offline
Toyota & Classifieds Moderator
*****
Sounds like the needle valve. Give your dipstick a whiff; if it smells like gas, get 'er fixed so you don't wash down your engine.

One of our members here composed and shares this article.

22R carb rebuild


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Democracy is two wolves and a lamb voting on what to have for dinner. Liberty is a well-armed lamb contesting the vote.

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Re: carburator float chamber gas level drops...then hard start [Re: jbclem] #822690 07/03/07 09:38 AM
Joined: May 2006
Posts: 457
D
Davepet Offline
Mudrunner
I had the same problem on an old 18R & never figured out where the fuel was leaking out. There is no way its the needle valve, since that valve sits above the fuel level, there is no way for it to leak the bowl down.

All you can do is rebuild the carb & look carefully for leaks in the bowl area.

Dave

Re: carburator float chamber gas level drops...then hard start [Re: Davepet] #822691 07/03/07 11:33 PM
Joined: Dec 2006
Posts: 233
Vanishing_Point Offline
Wheeler
I had the same problem. Check the aap diaphagm and aux. diaphagm for leaks.

Re: carburator float chamber gas level drops...then hard start [Re: jbclem] #822692 07/04/07 01:33 AM
Joined: Dec 2006
Posts: 386
C
cktoy Offline
Mudrunner
sounds like a rebuikd would be a good start.I also wonder if a vent problem on the fuel tank could cause a vacume somewhere when it cools and siphon your carb dry? anyway a carb rebuild is allways fun. <img src="/forums/images/graemlins/notooth.gif" alt="" />


oh what a feeling:
#1 86 xtra cab 22R,EB 261 cam ,Hooker header,2" ex with cherry bomb, Aussie powered
#2 86 sr5 4x4 efi parts truck
#3 87 2wd parts truck
84 supra yard art
Re: carburator float chamber gas level drops...then hard start [Re: cktoy] #822693 07/04/07 04:52 AM
Joined: May 2006
Posts: 457
D
Davepet Offline
Mudrunner
Quote
I also wonder if a vent problem on the fuel tank could cause a vacume somewhere when it cools and siphon your carb dry?

Once the fuel is in the bowl, you could put all the vacuum yo want on the fuel line & all you'll get is air.
The needle valve is in the top of the carb, separated by air from the fuel in the bowl.

Re: carburator float chamber gas level drops...then hard start [Re: cktoy] #822694 07/04/07 04:56 AM
Joined: Oct 2002
Posts: 15,887
kewlynx Offline
Toyota & Classifieds Moderator
*****
I believe the check valve in the charcoal canister won't allow that to happen.

He's got a carb problem. Yeah, I forgot about the AAP too.


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**
Re: carburator float chamber gas level drops...then hard start [Re: kewlynx] #822695 07/06/07 02:04 AM
Joined: Jul 2005
Posts: 45
J
jbclem Offline OP
Getting the Wheeling Fever
It's looking like the problem is the jet that squirts into the primary venturi is plugged up or not working well...just get a small wet dribble, but engine will start right up with a whiff of starting fluid and the float gas level goes right up to normal after it starts up.

I need to figure out where this jet gets it's gas...and my two manuals don't have the horizontal carburator drawing that shows all the passageways. Does anyone know where I can find such a drawing, I have it in an older Haynes manual but it's the wrong carburetor. My Haynes manual and factory manual for the 1984 pickup don't have this drawing and spend more space on EFI than carburetor. I'd like to know which passageways to blow out and which diaphragm is involved...is it the accelerator pump, or the auxiliary accelerator pump, or both, or neither?

jc

Re: carburator float chamber gas level drops...then hard start [Re: jbclem] #822696 07/06/07 05:02 AM
Joined: Oct 2006
Posts: 65
M
myyota Offline
Getting the Wheeling Fever
My 85 truck has this same problem, ive tryed two different carbs and i still have the same problem. both carbs are good and run well on my truck, but once its shut off for a few hours or over night the fuel level drops and its hard to start. I don`t think its a carb problem having tryed two different carbs, but i have no idea whats causing this to happen. <img src="/forums/images/graemlins/confused.gif" alt="" />

Re: carburator float chamber gas level drops...then hard start [Re: jbclem] #822697 07/06/07 05:14 AM
Joined: May 2006
Posts: 457
D
Davepet Offline
Mudrunner
In my 84 FSM, on page EC17 & EC18 there are schematics for the carb.

However, a plugged jet would not explain the fuel drain down. You might try removing the carb, filling the bowl & placing it on a safe srurface to see if you can tel where it's leaking.

Dave

Last edited by Davepet; 07/06/07 05:17 AM.
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