So my lt80 is having problems.

Compression is at 115 but there is not enough vacuum to pull the diaphragm open in the petcock valve to allow fuel to flow. I know the vacuum tube that runs from the carburetor to the petcock valve is good and has no leaks. I have cleaned the carburetor about 4 times, soaking it in a paint can full of carburetor cleaner for 20 minutes a time.

If I fill up the carburetor bowl myself, it will start and I will be able to do doughnuts around the yard until I run out of fuel.

This is and 06 lt80 with at FMF power core 2 Exhaust, brand new air filter, oil, and gas.

Thanks in advance for all your help.

 

Install a inline on/off valve and run the petcock on prime.
In the prime position, gas should run constant.

 

Ok Thank you