Had a small drama yesterday when entering leads to our proposed anchorage, the motor
cut out. Engine
is a Yanmar
3HM 30hp. No previous issues and ran smoothly earlier in the day when leaving port.
Sea state was very rolly and I suspected that I sucked some air in the line from the tank although the tank was approx 70% full. I noticed some air at the top of the feed line from the tank to the filter/ separator and some air at the top of the glass bowl.
Got the sails
up to get some sea room, bled the line, motor
restarted ok and we got in safely.
After bleeding though, I could still see air at the top of the fuel
line from the tank to the filter and some air at the top of the glass bowl so was not feeling overly comfortable on the way in.
Today, at anchor
I have filled the tank up to the brim and tried to bleed this remaining air out to no avail. What am I doing wrong here?
Setup is as follows:
1. Tank is stainless, approx 100 litres and is located under stbd quarter berth. Is an odd shape to follow hull
shape, shallow outboard
(approx 100mm) deepest inboard.
2. Tank was completely cleaned out a couple of months ago and a diesel
tank sealer applied to the inside to correct some pinhole leaks
. Seems to have worked with no leaks
line from the tank is at the bottom ie lowest point of the tank.
4. Fuel line goes from tank to the inlet port of a Lucas Cav filter/separator. Filter was changed after the tank was cleaned and resealed. Less than 30 hours operation since then.
5. Outlet from filter assembly goes to an electric pump
(looks like an addition, by a previous owner) and outlet of electric pump
goes to the Yanmar
fuel feed pump
mounted on the motor.
6. Filter assembly is above the level of the tank.
7. The manual priming lever of the fuel feed pump
does not work
. To bleed, I switch ignition on, electric
pump starts, crack the bleed nut on the secondary fuel strainer on the motor and wait till I get a clean flow.
I have done this and the engine
starts and runs fine at idle, at full revs and at full revs under load. But I can still see air at the top of the fuel line (just as it enters the filter assy) and there are a few bubbles at the top of the glass on the filter assy. I have never noticed this before and it has got me tossed and concerned that an unplanned failure will happen again.
How do I get this air out or am I good to go?
Any assistance appreciated.