396 mercruiser with Holley Carb

[Making Waves II]

Looking for help. When I started my recently rebuilt 396 Big block engine, I poured a little bit of gas down the carb and the engine started right away. After a couple of minutes the engine quit running. I tried to start it again and the engine runs fine for a couple of minutes then it quits. I noticed that the primary jets don't have any fuel coming out of them but the secondary Jets do. I changed the fuel pump thinking the old one might be weak.I took apart the primary fuel bowl and checked the float and needle setup. I lubricated everything and couldn't find anything wrong. I'm wondering what else I can check before I take the carb to a professional for rebuilding ( I'm not convinced that is the problem). Can the anti-siphon valve cause this problem? I cannot understand why the secondary jets get fuel but the primary jets do not. Any help would be greatly appreciated. Thanks.

 

[jimmbo]

When you took the Fuel Bowl off, did gas drain out of it? Which Holley carb are we talking about?

 

[Making Waves II]

Gas did not drain out, I want to say Holley 750 but I haven't run the list numbers to know for sure.

 

[jimmbo]

Gas did not drain out, I want to say Holley 750 but I haven't run the list numbers to know for sure.

Is it an Automotive Carb, or an actual Marine Holley?

 

[Making Waves II]

I'm not sure how do I tell?? The boat is new to me.

 

[Making Waves II]

I just googled it and its looks to be a automotive carb.

 

[alldodge]

Don't know of any marine manufacture which used the 396, so my guess is this is a auto motor which was stuck in a boat.

Since it runs a bit each time gas is poured in, then stops, the fuel pump isn't working, or lines/tank/filters and clogged

 

[Making Waves II]

The fuel pump is new just installed yesterday. If the secondary jets get fuel, would it still be a fuel delivery problem??
I'm trying to rule out carb problem.

 

[alldodge]

Pump throttle no fuel
Disconnect fuel line at carb and place line in a container
Crank motor, if fuel pumps out then its a carb problem, if it doesn't its a fuel delivery problem

 

[jimmbo]

A Marine Holley would have Vent tubes that are a J/U shape, or are connected to each other, If it is is an Automotive Carb, DO NOT use it