485 Mercruiser won't start

[rtoomey641]

Hi new to forum 485 Mercruiser engine backfires and will not start carb was flooding took apart and cleaned ran fine before flooding overheated before that

 

[boltonranger]

More concise details help.
Do you have spark?
Are you certain you have fuel?
Did you dribble any fresh fuel into carb to try to start with?
Have you pulled the distributor cap and checked the pickups for carbon or corrosion?
Was anything done to the motor after the overheat, like compression test ?
Details please.
-br

 

[stonyloam]

If you overheated it, better do a compression check, might have blown a head gasket. That is a 470 type engine, so very sensitive to overheating.

 

[rtoomey641]

Hi sorry so long to respond weird shift at work compression cyl 1(140) cyl 2 (135) cyl 3 (135) cyl 4 (132) new fuel pump just installed I think fuel line might be clogged tries to start runs for a second then dies when I look in carb I see wet gas that is confusing me is it running out or flooding?

 

[stonyloam]

Compression looks OK. On that engine it is wise to change the impeller every other year to prevent an overheat.