Verified answer

it's not vapor lock, it's called your carburator or throttle boby losing the gas thats in the float bowl after sitting for a couple of days.

It sounds more like you're having a starting electrical issue than anytihng else. Vapor lock can mean a few things, but the only thing that will really prevent a car from starting would be a vapor problem in the fuel system. Even in this case the engine would still crank over, however.

Do you hear a click when you try to start it? If so, start thinking about the starter motor itself. The clicking sound is typically that of the solenoid on the starter attempting to get the motor to spin. However, cases like yours happen when the metal contacts, what we call brushes, inside the motor have bad electrical connections internal to the motor. Sometimes a quick, albeit temporary fix for this is to strike the motor with something, a hammer, a stick, or whatever.

A steady clicking indicates a dead battery, but that doesn't sound accurate to your description.

If you hear no noise at all, you may be looking at a second starter relay (usually in the fuse box) or a Neutral Safety Switch (Auto trans)/ Clutch switch (Manual Trans).

Hopefully this helps you get pointed in the right direction.

we have a 1991 nissan truck my husband had been driving to and from work. I started acting funny. I would crank and run great but you couldnt shut it off till you reached your destination.. Work normally. you could not restart it immediately. you would have to let it sit for a few hours then crank it and go back home.. then again it would not start. Someone told him it sounded like vapor lock. we tried a few things before thinking it was vapor lock. so I read about the clothes pin fix and we tried it. first we did it wrong we put them on the fuel rail not the line. they need to be on the line we used about 6 on the line and the truck had an immediate fix! it starts every time you try it now. I dont know how it works I only care that it does work!! LOL... I paid $1.50 for a pack of clothes pin that saved us im sure hundreds of dollars in replacement/repairs.

I think is not vapor lock. I think the system drains itself out. It should have like check valve to keep the system primed. Sometimes the fuel pump has a build in check valve. For what I read seems that you have to wait for the system to prime with the electric pump. Not familiar with this year model but I would ask around, like a dealer, auto part stores and such. They might know what is exactly wrong with it.

But that was my best guess... I would look for some like that. A fuel system diagram will help to see and know what to look for.

I'm not familiar with that model, but if it does have a carburetor, it could have an economizer valve that leaks gas into the intake. On some cars it is on the rear of the carb and simply unscrews for replacement.

Black smoke on start up would be a sign of this problem.

FUEL PUMP IS PROBABLY NOT HOLDING PRESSURE YOU HAVE TO PUMP FUEL BACK TO FRONT OF CAR,GET SOMEONE TO CHECK IT OUT. if THERE IS A HUM AT BACK OF CAR THAT MIGHT BE A HINT THE FUEL PUMP IS GOING OUT,OTHER SYMPTOMS ARE INTERMITTENT DIES WHILE DRIVING.