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Message
Guys,
I have a friend who
has replaced his mechanical pump on an IO-360 twice due to low pressure.
It normally ran around 23 psi and was replaced because it sporadically dropped
to about 7 psi. We are considering the unique apparent failure of a second
pump after only 35 hours.
The fuel line was
trouble shot for leaks in pressure (40 psi) and to a 20 psi vacuum and it is
good to either tank. Vent lines are also both clear.
I am looking for
information about the nature of an engine side failure. That is, does the
cam? or pushrod? device which drives the pump arm wear? If so, is
failure ascertained through measuring the throw of the plunger?
The second pump is
also being sent back for bench testing.
I would love to hear
the thoughts of those with insight into the function of the drive portion of the
mechanical fuel pump.
Larry
Henney
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