From: "Sajid Ahmed" <skyhop@lhr.comsats.net.pk>

Dear Noel,
    I just read about your problem of the fuel surge.  I have flown a Mooney
for 2000 hrs and I had this kind of problem. The aircraft total time was 700
hrs with the same engine hrs. The Mooney is not Turbo Charged.
    I would have the same problem, the engine would run perfectly and then
suddenly I would loose power and the fuel pressure and fuel flow would drop
to almost nothing and could be rectified with running the Electric fuel
pump. The power would come back and there would be no more problems for
about seven to eight days and then it would happen again.
I suspected the Fuel tanks, cleaning found nothing, checked electric fuel
pump for bypass valve nothing.
Then one day the Engine driven pump failed and would not come back with the
electric pump.
    This was the day I found out that it was the Engine Driven pump which
was giving me the warnings which I could not understand.
    What was happening actually. The relief valve inside the engine driven
fuel pump would open to send the extra fuel back to fuel tanks and this
valve would not close and thus the engine would loose fuel flow and fuel
pressure and under normal circumstances the electric fuel would push the
valve close and the engine would perform normal.
    I am not sure what is happening to your engine but it is worth looking
into it. Mooney's Engine pump failed at only 700 hrs since NEW.

I hope this can help you find the problem. I sure would like to know how you
fix this problem.  I am just about to test flight my Lancair IV-P.

Regards.

Sajid Ahmed.