Dunno if your in tank fuel pump is like mine or not but my guess is the fuel line in the tank has a hole in it and its sucking air or the filter is clogged. Just a thought.

 

If you hear sucking sound in tank 99% chance you have a hole in gas line. Try filling tank to full and see if that doesn t solve your problem until the gas in the tank gets low. Quite a common problem. Hoses in tanks rub against things until a hole wears through. When you replace the hose, change your gas filter as well.

 

Why this is a good answer & is probably the problem & I hope you are running the stock plugs also this will cause problems to if you are not!

 

Hmm maybe. So is there a fuel line in the tank that goes from fuel pump to fuel? Sure does sound like this could no the problem.

 

When is the last time the fuel filter was changed?

 

Seems it is the fuel line in tank. When I filled it, it runs fine. Until the fuel level drops below the hole in the line again.