Recent content by Guffer

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    Mercruiser 120 poor starting

    Took fuel intake off the carb and cranked it a few times, so dont think it is the fuel pump. Will test the spark plugs next.
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    Mercruiser 120 poor starting

    I hooked up a fuel line with fresh fuel. She ran for 60-90 seconds and then died. Always felt like it was going to peter out. Does this suggest fuel pump is at fault? Was working before winterisation. When i try to restart she wont fire at all. Poured a little fuel down carb throat, wont...
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    Mercruiser 120 poor starting

    Yes, I winterised but head was already off. Based in uk, quite a mild winter. 40 l of new fuel but some treatment in existing fuel too. Issue is no fuel getting to carb. Thinking a blocked breather may also be the issue…..
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    Mercruiser 120 poor starting

    Yes, filter in the fuel pump is new. Will see if I can get rubber line on to copper fuel pipe. Many thanks
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    Mercruiser 120 poor starting

    It fires up if i put fuel directly into carb. Not pumping when i take fuel line off carb though. How best to add a temporary line before the fuel pump? Many thanks.
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    Mercruiser 120 poor starting

    Working back from fuel tank to pump, no blockages, including the sedimentor. Will attach a fuel line next time (one of the compression joints needs sealant to make it air tight).
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    Mercruiser 120 poor starting

    Back to the boat today, and put on rebuilt carb. Someone suggested putting fuel directly to carb. Tried this a few times and no better than before. Pulled out sender unit from tank. No blockage there. This is leading me to think that next i should be looking at the fuel pump?
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    Mercruiser 120 poor starting

    Super helpful. I have no access to the boat this week but will get back early next week and I’ll work through each step. Many thanks!
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    Mercruiser 120 poor starting

    Thank you ESG Wheel for your comprehensive reply. This is my first year with an inboard engine so it all a bit new. If there is no fuel in the filter / sedimentor does that not suggest a blockage in the tank or fuel line that goes from tank to filter/ sedimentor? - Fine mesh valve in carb is...
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    Mercruiser 120 poor starting

    Many thanks All, compression is 150 across the 4 cylinders and there is good spark on the plugs. It ran for a little longer yesterday then died. I concluded it was the carb and will clean/ rebuild this. In taking the carb of i found it was dry, as was the pump and sedimentor…. I had opened the...
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    Mercruiser 120 poor starting

    Many thanks for all the responses. I will go again tomorrow and check everything, filters and plugs are new so should be good. I have a 2nd carb i have just rebuilt it after a professional clean up. I might try to see if i can get my hands on a float pin (or is there an alternative?) and see if...
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    Mercruiser 120 poor starting

    Hi there, I recently had head worked on to improve compression on cylinder 4. On putting it back together it, it’s starting but petering out after 30 seconds. It’s had new spark plugs, fresh oil and filter, fuel pump filter changed. Fuel is only a few months old with stabiliser. I’ve not...
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