1987 Stalls after getting gas. Fine after a minute or two of running (1 Viewer)

[mapguy]

Hi,

My LC started doing this the past couple times I have gotten gas. If I had to guess, I'd say the charcoal canister is filling up with fuel when I get gas, causing a super rich condition and stalling. Once the engine sucks all the gas out of the canister, it runs fine. FYI - I do not fill the tank past about 2/3 full when I get gas.

Is there a check valve or something on the fuel tank that is getting stuck? The truck has a replacement AC Delco charcoal canister. Maybe that's the issue?

Did a search and got nothing. Thanks to mudders for any info to help point a fella in the right direction.

 

[Spike Strip]

Kind of sounds like vapor lock to me, though it hasn't been that hot.

When the truck won't start, remove the gas cap and see if you get a 'woosh' from a build up of pressure, then try starting. Also, check the sight-glass in the carburetor to see if there's gas present or even if it's boiling.

Is your carb-fan working?

So Cal RFG gas is crap and doesn't do well in carburetors. Particularly if you fill with gas that's 10% EtOh

 

[mapguy]

Carb fan works fine. Only happens when I get gas, so no whoosh since the cap was off to get the nozzle in. No whoosh from the cap when it’s taken off before the nozzle goes in. I will double check this today, though. Doesn’t happen any other time, only when I get gas.