how to KEEP teener running in hot weather, cool and cold weather good for 74 teener - WHY Options

[9fourteen14]

I have stated my question in a way to get the most responses/help/ideas possible.

when the weather is warm to hot and I have driven it for 4 miles or so, It really
wants to die. and then if i drive it any longer it will die in the hot weather.

THEN

after just waiting until (it seems like cools off - because engine if not running
it will start right back up and go.) in the hot weather.

I know others have experienced something like this BUT
I have never seen any answers that come close to my situation.

thanks for your help.
914 luva

[ClayPerrine]

I agree with replacing the fuel lines. Watching your 914 burn is heartbreaking. I know, Betty and I lived it.


For your running issue, it really sounds like vapor lock. Gasoline boils at approximately 90 degrees Fahrenheit. The fuel pump for a 74 and older 914 is mounted right next to the heat exchangers. So when you turn the car off, the gasoline in the pump stops moving and the heat radiated from the engine and heat exchangers boils the gas in the pump. There is no pump in existence that can pump a gaseous substance. It has to be liquid. So you are stuck on the side of the road with no fuel pressure. If you wait until the car cools down, it will start up and run fine.

The reason this normally doesn't happen when the car is moving is because the gasoline moves through the pump before it can boil. But it can happen. Get in the desert with high temps and it would be possible to generate enough heat to boil the gas while it moves through the pump. It's possible, but highly unlikely.

Porsche realized this was a problem, and on the 75 and 76 914s, they moved the pump up front under the fuel tank. That's what I suggest you do. But don't do it with the stock fuel lines 40+ years of existence has made them brittle and prone to breakage. Pushing 30+ psi down old brittle lines could be disastrous. I suggest getting a fuel line kit from Tangerine Racing and installing it. It is invisible unless someone crawls under the car, so you won't mess up your originality.