Ever since I got it I have not been at all convinced that the Merc 4hp I bought as an aux is working properly. My old Suzuki 6hp on the old boat used to start on 2 or 3 pulls even after sitting for ages, if it had been running the same day it would start first pull every single time and idle smoothly.
Compared to the Suz, the Merc has always been a pig to start and never idled smoothly. Now it doesn't idle at all but more to the point when I tried it this afternoon it wouldn't even start.
It had about 1/4 tank of fuel and the engine has what appears to be a mechanical lift pump on the side of the engine. This doesn't appear to lift any fuel - with the tank 1/4 full, I took the pipe off the carb and pulled and pulled and pulled and F all came out. I am sure on the Suzuki if you did this you got a fairly steady stream of fuel after a couple of pulls and I think that's what should happen. There is no manual priming pump as far as I can see, and presumably an engine should start with 1/4 tank of fuel.
So I filled the tank right to the brim and then fuel came out ... and it started.
I assume the lift pump is probably knackered and has probably never worked - anybody agree with this?
Having got it running it is the same as it has been the last couple of times I have used it - it simply will not idle. Once you get it going (which is a bit of a chore often needing 10-15 pulls) it will idle fast on choke but even when warm it won't idle at all - you have to have the throttle at about the "fast idle" position or above, or it will stop.
It's only on its second tank of fuel since new (total run time maybe an hour to an hour and a half) and both times it has been filled from a clean can with fresh fuel so contamination in the carb should not be a problem unless it has been there from the factory. Having said that when I first got it I sat it on my engine stand and filled it with fuel which promptly all ran out the bottom of the engine as the fuel pipes weren't connected, so it may be a Monday morning job from top to bottom
Any thoughts on the above please? It seems like similar symptoms to my Suzuki when I did have fuel contamination issues with that after a couple of years but this should not be unless it is a problem from the factory.
I'm obviously about to email the supplier with the above info as it's still under warranty, and I haven't picked anything to bits yet as I want their view first, but any thoughts would be welcome as I will have to fix it myself anyway. At the moment it's not a hell of a lot of use as an emergency aux if it won't start and run properly