Piston power loss

[goodlooker]

We operate a Slinsby Firefly T67B with a 116Hp lycoming engine. We have experienced complete loss of power at Approx 2/2500 ft when the electric fuel pump is turned off. A new mechanical pump has been fitted and today the problem re-occurred. it can't be re-created on the ground and all pre-flight checks are OK. Any ideas appreciated, could it be pressure related in any way?:confused:

[ericferret]

Had something similar years ago. The plunger that operates the engine driven pump had been damaged on a pump installation and wasn't actually operating the pump.

With the pump off and a mirror you could see that the rear cover where the plunger ran was cracked allowing the plunger to fall off the end of the pump operating arm.

[goodlooker]

Thanks, that sounds worth a look, i'll have to get it back to our engineers this week. Its certainly a new one to me!

[ericferret]

Should have said that this was on an O-540 in a 172RG.

[ericferret]

Should have said that this was on an O-540 in a 172RG.
Hope it isn't this as a new rearcover is the fix!!!!!