1975 merc 850 fuel issues

merc75

Cadet
Joined
Feb 24, 2014
Messages
7
Tried my new to me 1975 850 merc on the water engine ran great but keep losing fuel pressure. i think my carb floats are not sealing off when i trim up gas starts leaking out front of carbs could that cause gas line to lose pressure? thought it may be my fuel line but tried the line on my other boat no issues there or could it be bad fuel pump working part time?
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,997
Re: 1975 merc 850 fuel issues

Fuel running out of the carbs when motor is tilted is normal. I am not sure I understand the balance of your post. Does the motor loose fuel prime and stall, causing you to pump primer to refill the carbs? If so, the fuel pump likely needs to be rebuilt.
 
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