FJ60 fuel issue help (3 Viewers)

[Keep]

Recently I picked up an 87 FJ60, all smog equipment intact. Ran fine on test drive but learned soon after purchase it had the original gas tank and it was full of rust. The local dealership agreed to replace the tank and the whole fuel system with available parts under the old tank recall.

Ran great for a week after that. Second tank of gas I put in it, it overflowed at the pump without the auto cutoff. I wiped it down and drove it about 5 miles fine. When sitting at a stop sign it died with a big puff of smoke from the pipe. It would not start back up at all. After a few minutes of annoyed looks and honks from those going around me I went full choke and pumped continuously. I fired up but ran very rough, sputtering and trying to die. I got it to the side of the road and it died again. I waited a few minutes but could not restart it. I had to towed back to the Toyota dealership to have them check over the work they did. When they started after receiving it 2 hours later it started right up and ran fine on a test drive. I was thinking a clogged vent or something up with the charcoal canister for the overflow, but would that cause it to die and not restart several minutes later?

Any ideas?

 

[CruiserTrash]

Charcoal canister is the likely cause of the gas station overflow. There’s an AC Delco part that works with a bit of creative plumbing, although that didn’t completely solve that issue for me. Search for that and you’ll find lots of reading material.

Where was the fuel level in the float bowl sitting when the truck died or ran rough? What color was the puff of smoke? What’s your engine vacuum? That issue will need further diagnosis.

 

[Keep]

Charcoal canister is the likely cause of the gas station overflow. There’s an AC Delco part that works with a bit of creative plumbing, although that didn’t completely solve that issue for me. Search for that and you’ll find lots of reading material.

Where was the fuel level in the float bowl sitting when the truck died or ran rough? What color was the puff of smoke? What’s your engine vacuum? That issue will need further diagnosis.

Smoke was black. I didn't check the fuel float right when it happened. I'll have the vacuum checked while its still there. Thanks.

 

[OSS]

When the gas tank gets overfilled, liquid gasoline can enter the ventilation lines and get pulled into the charcoal canister when you start driving. The charcoal canister is lower than the gas tank, so if the gas cap isn’t sealing tight, a siphon can set up and fill the charcoal canister with gasoline- which then pours out of its drain hole at its bottom.

When the charcoal canister is filled with liquid gasoline in this scenario, the engine chokes on it when you start driving & press down on the gas pedal. It’s too much fuel, the A/F mixture is way too rich (flooded engine) and the engine can stall and die.

Trying to start the engine after this happens by using the choke, makes everything worse because the engine isn’t starved of fuel, it’s drowning in it.

After enough time goes by, the excess fuel drains from the charcoal canister, and excess fuel evaporates — and voilà, the engine then starts and runs fine.

This could have happened.
(It happened to me once)

 

[CruiserTrash]

Smoke was black. I didn't check the fuel float right when it happened. I'll have the vacuum checked while its still there. Thanks.

Black smoke is too much fuel. @OSS is on the right track (as usual) with thinking about overfueling.

To add to individual experiences, I’ve now had two carbs where the float bowl drains when I shut the motor off. It happens in about 10 minutes. Liquid fuel is puddled in the intake. It’s hard to start and runs rich for 2-3 miles, occasionally bucks when I give it too much throttle in a certain way, I get some black smoke, idle is jumpy, etc. Easing into the throttle until I have it down all the way and going fast for about 1/2 mile usually clears it out.

On the Flipside, though less likely with the black smoke, is a vacuum leak. Maybe a hose is loose or a smog widget is malfunctioning.