HELP!!! Fuel Problems!

[Aaron65]

Hey all,
My '53 Special with 263 Stromberg 2 barrel runs for 5 seconds then erupts fuel from the fuel bowl then dies. The fuel comes out the vent and goes all over outside and inside the carburetor and is flooding the heck out of my motor... This happens with the motor running or the starter turning it and all the spark plugs out...I've tried two carbs and it still happens. I've tried several needles and seats. I've tried two fuel caps, and no fuel cap. I've had both carbs apart and they look fine. It started happening last Friday. Could the fuel pump be the culprit? Supposedly the fuel pump has a diaphragm and spring design that slows down fuel flow when the needle in the carb is shut...could this go bad? Any ideas...for once I'm totally at a loss! PLEASE HELP!!!!!!!!!

Aaron

[Smartin]

If fuel pressure is too high, then yes, that may be the problem. At first, I was thinking the float was stuck, but that was out the window when you said you changed carbs, and had them apart.

[doc]

What Adam says is pretty well right on. It just about has to be excess fuel pressure. There is a relief valve in side the stock manual pump that is supposed to let the fuel by pass once it comes up to pressure. That is probably stuck or plugged up some way. Be sure to check the oil level and see if it has forced gas into the crank case. :Brow:
Install a new fuel pump and put a good pressure regulator just before the line goes into the carb. That should solve the problem. :pp

[Aaron65]

I really appreciate it guys...it really can only be the fuel pump now, but people looked at me like I was insane when I said it seems to have too much flow! Normally with fuel pumps it's not enough! :)

[Aaron65]

Well, it seems it was indeed the fuel pump...weird. If you've never rebuilt a combo fuel/vacuum pump, you owe it to yourself to try. Just kidding--it sucked (at least the vacuum side Ha ha). The only problem is a leak from the fuel filter to carb area...I didn't run it long because I need to change the contaminated oil...but knock on wood...I hope it's fixed! Thanks for the suggestions. Oh, the only problem I found on the fuel side was a bad outlet check valve...