I then tried to bleed the air out of the system but the manual lever on the lift pump got me about ten drops of fuel per 100 pumps.
Does this mean that the lift pump is toast?
The manual lever on the lift pump on Rauzer II worked well once I figured out how it works. If you just push it down until you feel resistance then let it up, almost nothing is pumped. I had to push it down about another 1/4 inch or so, then when I let it up it gave a little squirt. It seems that only that last little bit of a push actually moved the diaphram.
The varying rpm,s while underway is almost certainly the small secondary filter. I have to change mine a couple times a year. Eventually I want to clean the tank and replace the fuel lines to eliminate this problem, but it is low on the priority list for this year.
I changed my lift pump last year. Any Yanmar dealer should have them in stock.
