Vapor lock, how to avoid?

[Black Arrow]

Hello everyone,
I recently bought my CJ5 and little by little has been giving truble, of course I understand that it is an old jeep and I have to spend time and money on it.
I used to have 2 xj's and lifted them and maintan them myself, but I am not used to deal with this great rigs.

the situation is this:

Afte the thermometer reaches half, the gasoline just evaporats.
The jeep has the fuel filter in the wrong place and with the wrong material on the line,
The filter is set right just above the engine, and it captures a lot of heat of course, also, the lines that go from the fuel pump to the filter and filter to carb are copper, I know this shouldn´t be done, so I come to you for a little help here, the jeep is consuming a lot of gas and it turns of at the most unexpected moments...

 

[73CJ]

Are you sure about copper fuel lines? The factory were zinc plates steel.

 

[73CJ]

Are you sure about copper fuel lines? The factory were zinc plated steel.

 

[BusaDave9]

I have had a big problem with vapor lock. I tried every "fix" out there without luck. A mechanic once told me there is no fix for vapor lock because the carb is mounted on the top of the engine. He said that's where the vapor lock will always be.
Well, I finally did it. I got rid of my vapor lock. What I did was install an electric fuel pump back at the gas tank. I was very reluctant to do it. A mecanical pump is much more reliable. If the engine is running the pump is being activated. If an electric pump stops it could be all kinds of things: bad pump, bad ground, bad wire, bad solenoid, bad fuse. But the electric pump fixed the vapor lock.
Make sure the pump is down low. They say it should be lower than the tank but you can't hardly do that if it's an off-road vehicle with an over-sized tank. If the pump is too high then you will have a hard time starting it if you ever run out of gas. Even if you fill the tank the pump with be up high and dry. It will try to suck air to pull the gas. That doesn't work. Some try to blow air into the tank to prime the pump.
An in-tank pump solves that problem but they are a pain to work on since you have to drop the tank.

 

[IOPort51]

I hate to suggest this but I think I would drain the tank and drop it to check the screen on the pick up.

 

[Black Arrow]

The lines that the jeep has are no the factory ones, they were made, I tought that´s where the problem is, I'll try first to change those lines for the nickel ones, than I´ll blow the tank also, I know is a common problem but this paricular case is happening after driving the jeep for 45 minutes and sometimes less, changing the radiator came to my mind also...


thsnka for your replies guys, ...