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

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.

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22R carb rebuild

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

I had the same problem. Check the aap diaphagm and aux. diaphagm for leaks.

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="" />

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.

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.

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

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="" />

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