Fuel System 337F

[Jeff A]

I have a factory reman in the rear (100 hrs) and original engine in the front (1,600 hrs). With the engines not running, mixtures pulled and the auxillary pumps on, both engines are leaking fuel through the manifold drains. With the engines running with only the mechanical pumps, both engines quit normally as the mixtures are pulled. Any suggestions as to why fuel is getting to the engine when aux pumps are on and mixture is pulled?

[rick bell]

i do not know if this is the same problem; however i had fuel running out by the mechanical fuel controller on the rear eng (73p) the only way to stop it was to turn the fuel selectors off. the shaft to the engine has two "o" rings and the outside "o" ring was bad (this was a factory new controller with less than 100.0 hrs). very easy to fix, remove the controller, dissassemble the controller r/r the "o" ring, takes about an hour and no big deal for any a&p. never started a fire, was dripping on a 4 hr flight