5.7 chevy mercruiser starts but wont stay running

i changed carberators and it still wont stay running or idle ,cant figure out. cant find vacuum leaks either

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Jun 10, 2021
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on fuel after start up
by: swoop351 gmail

compression test lol da it's your oil pressure switch it's not sending a signal your motor is running it normally open crank pressure Closes switch to fuel pump pump on no pressure on fuel

Jun 21, 2014
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2001 Sea Ray 190
by: Joe

Took line off carb, As you turn it over it pumps fuel. Fill carb and start it up and the fuel stops and the pump loses power.
Thanks Joe

Jun 20, 2014
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running
by: Don

You might half to do a compression test on it ,
unless it doesn't have fuel pump pressure.How old is the pump?