How to find a vacuum leak.......

[84CUCV]

I have a 1405 carb on my 80 p/u. It has been suggested to me that I have a vacuum/timing problem. When it get on the gas it shuts down. I thought it was a fuel problem. So what to look for so I can get her running right.

Thanks for the help

Mike

 

[alec78]

Have the engine running. Carefully and slowly spray it with carb cleaner. Listen to the engine. When it changes tone (speed), go back to where you just sprayed. Spray that area again, even more carefully and paying more attention. This will help you zero in on a leak. /forums/images/graemlins/thumb.gif

 

[84CUCV]

Thanks i will give it a try. Mike

 

[K5MONSTERCHEV]

Or use a smoke machine.

 

[84_Chevy_K10]

Propane works too. /forums/images/graemlins/thumb.gif

I usually use carb spray or wd 40.

 

[crawford]

Or use a peice of hose. Put one end up to your ear and check suspect areas with the other end for a hissing/sucking sound.

 

[84CUCV]

Cool thanks more ideas. mike