Thread: New Problem - Fuel Coming Out of Front Fuel Vent

Tweet

I was about to start up my newly-put-together SBC and fuel started shooting out of the front fuel bowl vent when the fuel pump came on.

What the!

Any ideas? It worked before I took the carb off without a problem like this...

The only thing different this time is that I hooked up the electric choke. Could I have the pos and neg reversed? Or a bad choke?

I guess I should try it without the choke plugged in...

Sounds like your fuel float is stuck or too much fuel pressure?? Just a guess.

Don

What type carb??? Probably float.

Take the wooden handle of a hammer and lightly rap on the front bowl of the carb to see if it will unseat the float, assuming that is what you have.

In shipping sometimes they get stuck. We always had to do that to outboard motors we sold because the floats always stuck on brand new, out of the box motors.

Don

Originally Posted by Itoldyouso

Take the wooden handle of a hammer and lightly rap on the front bowl of the carb to see if it will unseat the float, assuming that is what you have.

In shipping sometimes they get stuck. We always had to do that to outboard motors we sold because the floats always stuck on brand new, out of the box motors.

Don

It's a Holly 600. I'll try the hammer thing since it got moved around a couple of times before I got it back on. I'll report back in a few minutes...

If not, how do I check for the other potential problems?

It's a well-used Holly 600, too. It looks like it has been around the block a few times!

Whar happens in a used carb is that gas left in there turns to varnish, and it gums up the inside. Your float and needle valve are probably stuck, and sometimes the only fix is to soak the carb and rebuild it.

Don

Whar happens in a used carb is that gas left in there turns to varnish, and it gums up the inside. Your float and needle valve are probably stuck, and sometimes the only fix is to soak the carb and rebuild it.

I'm not a Holley guy, but don't they have float adjusting screws on each bowl??


Don

Originally Posted by Itoldyouso

Whar happens in a used carb is that gas left in there turns to varnish, and it gums up the inside. Your float and needle valve are probably stuck, and sometimes the only fix is to soak the carb and rebuild it.

I'm not a Holley guy, but don't they have float adjusting screws on each bowl??

Don

I don't know fi the floats have adjustment screws. I'll have to look into it. I wonder if I should just start with another carb? I guess I can always just take the Edelbrock 650 off my other V8 an run it on this one for a while.

Good move. Keep a fire extinquisher handy during all this changing around.

Don

Originally Posted by Itoldyouso

Good move. Keep a fire extinquisher handy during all this changing around.

Don

It's sitting in the passenger seat!!

That's a long way to run for it if you have an engine flare-up.

It's not so far since the engine is in the rear!

The adjusting screw is on top of the bowl, it has a jam nut under it. Losen the nut and turn the screw to adjust the height. There is a site plug in the side, take it out and adjust until fuel just dribbles out of there.

I would suggest taking the bowl off first and cleaning it out.