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Bubbles in fuel return pipe. 2gm20. Normal?
My 2gm20 almost didn't start on me the other day when about to enter the marina. It was certainly harder to get going when I left the mooring earlier. I decided to replace all filters, change oil, but it's still being a bit of a pig to start, even when warm. I've seen others start 'on the button' (I managed it once today), but this one now takes about 10 seconds and slowly splutters into life. It's making me nervous!
After changing both fuel filters I bled the air from both. Engine starts and runs, but as mentioned, not without effort to get started. I followed the instructions in the service manual and a few times have bled the filters, fuel return pipe, and injection pipes. I don't see any air, though after I last bled the return pipe, hit the starter, 1st crank it fired up. Thought I'd cracked it, but next time, back to normal.
I noticed looking at the fuel return hose, I see small bubbles entering it from the engine side and flowing up the pipe back to the tank. Sometimes a big bubble. Surely there should be no air in this pipe, or is this normal? Air must be getting in from somewhere and I cannot imagine/see where this would come from. It's not from the primary fuel filter which is the highest point in the fuel system. There are no fuel leaks I can see either.
Any suggestions? Thanks.