Vapor lock on 22r motor

[ttFJC]

Ok guys. Seems like I’m having a bit of trouble with the gambler trok in the heat. 1986 pickup 22r carbonated
Truck starts up fine, drives just far enough to make it to the dog park just about three miles away and then won’t start u till it’s had at least half an hour to cool off. Today it died on me 100yards before the parking lot and same thing wouldn’t start back up till it cooled off then it died as I was rolling into my parking spot at my condo.

What do you carb guys know about preventing this. Do I need a new fuel pump or something? Rebuilt carb? I got a gas cap and poured some Heet fuel and carb cleaner into the tank but didn’t seem to help. Also haven’t driven it enough to work the heet into the fuel lines yet. Someone told me to wrap the fuel lines in tin foil.

Any suggestions?

 

[3_puppies]

does it stumble when dying? or just like the key was turned off?
I'm thinking more electrical than gas issue
when it does fire up, does it take lots of cranking? or does it fire up with minimal effort?

 

[ttFJC]

Fires up with minimal effort. A bit of pumping the gas pedal when it gets hot. When it dies it’s kind of all of the sudden. Or it just won’t start if I don’t wait a while

 

[pigmony]

If it is vapor lock, it could be that the fuel pump is weak. A phenolic spacer under the carb can help. You can put some washers between the hood and the hood hinges to let some heat out of the engine compartment. @3_puppies is on to something with his questions though. Typically vapor lock presents with a bit of stumble before the engine dies.

 

[4gotalot]

Carb icing. It's an easy check and make sure the system is operational. There is a butterfly valve at the end of the air inlet horn with normal one vacuum line attached two what looks like a can of chew. Under that can of chew looking thing coming out of the air horn is a 2 inch high temp rigid foil hose going to the top of the exhaust manifold.

Carb icing is very common with carbs. A visual inspection can be done by quickly removing the air cleaner when the problem happens and look for frost inside and above the Venturi. The frost will melt quickly from heat coming back up the carb after engine shut down so hopefully you can glide back to the airport...Its on the ck list, Carb heat-"ON" at take off and landing or if humidity and temp are just right to make clouds... big blue sky, thunder storms, big blue sky, thunder storm etc etc.

 

[90WT]

What are your engine temps when it dies? Is your motor getting too hot (low on coolant, thermostat nonfunctional)?

Could be coil related. I had a bad coil that died when hot, then eventually just died.

 

[ttFJC]

The idiot gauge on the dash never goes past halfway. Has coolant in it. Only seems to drive long enough to get up to normal operating temperature. So I don’t think it’s running hot

 

[pigmony]

Could be coil related. I had a bad coil that died when hot, then eventually just died.

I like that idea. That would act like what Aaron is describing.

 

[thetoyotaman]

IME vapor lock not really an issue on a 22r. Something else is going on. Do simple checks first. Make sure both butterflies are free and not sticking common with carbs over time. They need an annual clean with carb or brake cleaner. Make sure vacuum hoses are not cracked. Spray brake clean down cylinder head and intake where they meet at idle and if rpm changes you have a vacuum leak.

 

[mccracken]

Does your pickup have a charcoal canister and one of those vapor return evaporator things by the tank? 60 owners always talk about fuel system pressure build up and leads to failed starts when the system is hot. Fresh charcoal canister and checking the evaporator is functioning has helped. I’m not an expert, probably using the wrong words, but my 60 used to struggle to restart on hot days and this helped mine out.