Search results

  1. N

    Mercruiser 5.7 carbureted wont start when warm

    Alright, I ordered the fuel pressure tester(I can use it for other things as well) and it was supposed to be here yesterday and didn't arrive. Anyway, I decided to swap carbs and see what happened. I cleaned up the old carb and put it on just to see if I still had the same issue. The boat fired...
  2. N

    Mercruiser 5.7 carbureted wont start when warm

    I have a good shop that I trust so I'll try bringing the old carb to them and have it rebuilt. I've been told mixed things about whether or not this new carb will work on my engine. Some say it's fine, some say it will need to be jetted or replaced. I still am trying to figure out the original...
  3. N

    Mercruiser 5.7 carbureted wont start when warm

    I believe it was bogging down unless you very slowly gave it throttle. I rebuilt it and had issues with it still so I called a mechanic and he said it was the carb, so he replaced the carb. I pulled the carb and cleaned the needle and seat but I couldn't get the seat to come out, it was going to...
  4. N

    Mercruiser 5.7 carbureted wont start when warm

    I'm not sure how to tell if the original carb was worn out or not but I rebuilt it specifically as the rebuild instructions said and it still had issues which is why I called a mechanic. I got in touch with the mechanic and he said even IF the was the carb for the 5.0 it wouldn't have any issues...
  5. N

    Mercruiser 5.7 carbureted wont start when warm

    I checked the plugs and they look somewhat clean. A little bit brown around the porcelain. I'm going to call the mechanic that installed it and see what the deal is. He specifically said he had to order the parts so they weren't the wrong ones, so for him to F that up really irritates me. I'm...
  6. N

    Mercruiser 5.7 carbureted wont start when warm

    Okay, I took the carb off to check the float height and it seems to be too high(causing the carb to flood). I was looking for the little ruler to measure the float height and found the old carb in the box that the new carb came in. Turns out the new carb is a Sierra 18-7375N. It says on the box...
  7. N

    Mercruiser 5.7 carbureted wont start when warm

    Sorry, it would be 18-7376N. The 18-7375N is for a 5.0 not a 5.7.
  8. N

    Mercruiser 5.7 carbureted wont start when warm

    Okay, I checked the carb, there are no markings or numbers on it, but after doing some research I believe it's a Sierra carb(I thought Sierra was a decent brand, you think they would have some markings or something to identify it) Here is a picture of the carb I BELIEVE is on it. Not 100% sure...
  9. N

    Mercruiser 5.7 carbureted wont start when warm

    I tried rebuilding the original carb with an OEM kit and the check valve would not seat. I even brought it to a reputable boat shop that I have been to before and trust pretty well and they said it can get worn out and just won't seat anymore. Unfortunately the original carb got thrown out with...
  10. N

    Mercruiser 5.7 carbureted wont start when warm

    BTW, the video showing the fuel dumping into the carb is with the engine OFF. The engine temp was 170 and the motor was off and it was still dumping fuel
  11. N

    Mercruiser 5.7 carbureted wont start when warm

    Okay guys, sorry for the late reply. I spent most of the day yesterday trying to figure out what the heck is going on. I took a picture of the carb so i can post it. I also got a video of what is going on and saw the carb is flooding when the engine is warm and not running. It keeps dumping a...
  12. N

    Mercruiser 5.7 carbureted wont start when warm

    The engine serial number is 0L031915 I didnt see any markings or numbers on the carb. I'll have to check again to make sure. If I open the throttle all the way it will start within about 5 seconds. I noticed when I shut it off the venturi was leaking enough fuel to form a puddle in the carb and...
  13. N

    Mercruiser 5.7 carbureted wont start when warm

    Hey everyone, I have a 98 Mercruiser 5.7(carbureted) that will start fine when cold but when it's warm it wont start. I read about vapor lock and wrapped the fuel line with insulation tape(I know some people say vapor lock doesnt happen on carbureted engines and some say its very common, who the...
  14. N

    1973 Evinrude 18hp backfires but wont start

    I bought a 16' Jon Boat with a 1973 Evinrude 18hp motor and it will not even try to start even with spraying a little starting fluid into the carb.. I was told its been about 4 years since it was last ran but it ran great before it sat. It just backfires through the exhaust. Ive cleaned the...
Top