I went out for a sail the other day and when returning to my slip the engine
started missing and died. I managed to restart it to get in but the engine
would only run at higher RPM
. I didn't have time to look into it any further then. Yesterday I had an couple of hours at it, checked tank, all the lines and filters and tried bleeding it. Everything appears good, sight glass in primary filter shows good clear fuel
, all connections tight no signs of leaks
,lift pump moves lots of fuel
, over a litre of clean fuel out of the return line in 20-30 seconds. But symptoms persist.
Hard to start, have to give it full throttle for it to catch, it won't run below 1500 RPM
and misses at higher RPMs, will develop full RPM at no load. I tried to move boat, it will do it at higher RPM but misses and will motor
at near full speed (5.5 kts for a very short while anyway that's all I tried) but stilling missing occasionally.
is a Volvo
2001 9 hp single
, it's 1986 model that was stored new for years I installed it last spring, still had the clean factory oil
in it. All new tank, lines and filters, I put 46 hrs on it and it's been working like top till now.
Other than sucking air some where I can't think of anything else it could be. Is there another possible problem? Couldn't be bad valve spring or something else in the head
I know air leaks
aren’t always easy to find but this has me stumped. I will get another couple of hours at it today to see if I can find something, maybe try to find a way to pressurize the tank.