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Old 11-30-2010, 09:09 AM   #18
RickB
Scraping Paint
 
City: Fort Lauderdale
Vessel Model: CHB 48 Zodiac YL 4.2
Join Date: Oct 2007
Posts: 3,804
RE: Small Surges in RPM Every Few Minutes.

Quote:
GonzoF1 wrote:

I'm curious why it only happens every few minutes, though?
If it is air, the flow through the system is not very fast and the air may collect in a high spot until it can bubble over into the main stream so to speak and then move into the high pressure pump.

The governor increases fuel delivery to maintain rpm then when the air has cleared the injectors it is a bit slower (because of inertia) to slow the engine down again. That is why you see a small rpm increase above the sepoint but nothing below it.

I don't think you will find much of a leak, it will be very slight.
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