Carb/Gas issues
Carb/Gas issues
My '87 3AC 4x4 always reeks of gas (inside) after being parked for a few hours. It's not the fuel filler tube...checked that and does not leak when filled right up. I had that problem on a previous Tercel and there is no gas smell when I drive. I've replaced the fuel pump and that had no effect. There are most likely carb issues...pretty much a given. After some careful tweaking of the carb and timing it actually starts, idles and runs great hot or cold but the fuel economy is crap and the exhaust definitely smells rich. I changed the head gasket a while back and when I was removing the vacuum lines I was surprised to see gas spilling out of a vacuum line leading to what I believe is one of the carb solenoid switches? There are these mounted side by side on the body, carb side. From what I've read on here the solenoids somehow increase fuel economy when decelerating? Is it normal for fuel to be in these lines? Also wondering...when the car is parked, should the butterfly (choke) valve be open or closed? Mine sits open when parked but if I manually disturb the accelerator linkage, it falls closed. Is it sticking open? Could this cause the remaining fuel in the carb to evaporate and maybe the odor is seeping into into the car when parked? Any ideas?
'87 4WD wagon auto trans. 185,000km
This is a pretty complicated carburetor with a lot of diaphragms. I can't think of any that would suck up gas if ruptured, but who knows. You could have a problem with the canister vapor recovery system. Possibly a defective purge valve. BTW, you can damage this system if you consistently fill the gas tank beyond the first click of the nozzle.
Your choke is working normally. When you shut it down hot, the choke is open and is stuck open by the throttle linkage. As soon as you open the throttle far enough to release the choke, it closes. This is true of chokes on all cars. You have to press the gas on carbs with manual chokes in order to get them to set properly.
Usually the biggest problem with chokes is the pull off. These have a two stage pull off with two separate vacuum diaphragms. If you don't have a problem during warm up, then both of these are probably good.
Your choke is working normally. When you shut it down hot, the choke is open and is stuck open by the throttle linkage. As soon as you open the throttle far enough to release the choke, it closes. This is true of chokes on all cars. You have to press the gas on carbs with manual chokes in order to get them to set properly.
Usually the biggest problem with chokes is the pull off. These have a two stage pull off with two separate vacuum diaphragms. If you don't have a problem during warm up, then both of these are probably good.
A common failure, and one thing to check, would be the AAP diaphragm. If its been bad/leaking for quite a while, the gas leak will damage the TVSV, possibly allowing gas into other vacuum lines.I changed the head gasket a while back and when I was removing the vacuum lines I was surprised to see gas spilling out of a vacuum line leading to what I believe is one of the carb solenoid switches? There are these mounted side by side on the body, carb side. From what I've read on here the solenoids somehow increase fuel economy when decelerating?
Have a look at:
viewtopic.php?t=2407&highlight=aap+diaphragm+leak
The large rubber tube going to the carbon canister can actually melt...due to the gas going thru it. I had the same gas smell until I replaced this. Use gas line hose?
Give a boy a gun-give a biatch a cell phone-and pretty soon you almost got yourself a police state.
Orwell said: War is peace! Freedom is slavery. Ignorance is strength...
Orwell said: War is peace! Freedom is slavery. Ignorance is strength...
Last weekend, the CandyWagon quit. Inspecting the original equipment carb showed no signs of fuel. It would crank a little if fuel was dumped into the carb. I replaced fuel pump and filter the next day. It ran far enough to leave my friends comfortable garage. Just far enough to be in the closest busy intersection in ChickenDale. The really good thing about these cars is a large man can push it easily by himself while reaching through the window to steer.
Well. Now the carb was flooding. Was the new fuel pump to strong? Did a piece of trash get lodged in the needle seat?
I don't even like taking a carb apart on my workbench, much less in a grocery store parking lot.
In desperation, I took the top off the carb, cleaned the fuel bowl, pulled the needle and float a couple of times. The float seemed set really low. I barely noticed movement once while attaching the float. The needle seat had came loose and back-off.
At first it starved the carb until it shook out enough for gas to leak around it, the it flooded the carb.
Well. Now the carb was flooding. Was the new fuel pump to strong? Did a piece of trash get lodged in the needle seat?
I don't even like taking a carb apart on my workbench, much less in a grocery store parking lot.
In desperation, I took the top off the carb, cleaned the fuel bowl, pulled the needle and float a couple of times. The float seemed set really low. I barely noticed movement once while attaching the float. The needle seat had came loose and back-off.
At first it starved the carb until it shook out enough for gas to leak around it, the it flooded the carb.