Trying to figure out why fuel was leaking from the airbox on a FI engine...
Here's the story. The battery was dead last night and so we hand proped the IO-320-E2D. We tried mixture rich settings/throttle 1/8 open & mixture cut-off/throttle full settings. For each we built pretty good fuel pressure just hand propping it and both times fuel began leaking from the airbox. Left a good 1 ft diameter spot on the concrete...so that's quite a bit of fuel (fire extinguisher close by).
I'm guessing since it's FI'd that the fuel was sprayed into the cylinders, then leaked out of the intake valves down to the airbox, then along the lower cowling to the ground? Not sure why any fuel would be delived with the mixture in cut-off though.
I just don't understand exactly what's going on here and why hand propping it would make a difference than using the starter.
If anyone has some experience on this, I'm very interested. Maybe there's a rule out there I don't know about that one shouldn't ever try to hand-prop a FI engine...haven't heard that, but who knows...
Thanks!
-Jim
P.S. Ended up jumping it with another battery and it started right up.
Here's the story. The battery was dead last night and so we hand proped the IO-320-E2D. We tried mixture rich settings/throttle 1/8 open & mixture cut-off/throttle full settings. For each we built pretty good fuel pressure just hand propping it and both times fuel began leaking from the airbox. Left a good 1 ft diameter spot on the concrete...so that's quite a bit of fuel (fire extinguisher close by).
I'm guessing since it's FI'd that the fuel was sprayed into the cylinders, then leaked out of the intake valves down to the airbox, then along the lower cowling to the ground? Not sure why any fuel would be delived with the mixture in cut-off though.
I just don't understand exactly what's going on here and why hand propping it would make a difference than using the starter.
If anyone has some experience on this, I'm very interested. Maybe there's a rule out there I don't know about that one shouldn't ever try to hand-prop a FI engine...haven't heard that, but who knows...
Thanks!
-Jim
P.S. Ended up jumping it with another battery and it started right up.