Can an engine flood at idle ???

christian

Senior Member
Had an odd problem today, got stuck at a railroad crossing for about 10 mins. Of course, as the gates open and traffic starts flowing my A started to sputter and die before I could give it any gas.

So im in the roadway stalled out, with seemingly miles of cars behind me honking angrily, I limp to the side of the road using the starter motor and begin to access.

plenty of electrical power, with ignition on ammeter bounces like it should when cranking, took a screw driver to the plug leads while cranking, all showed spark then screw driver held near head bolts.

I figured the problem must be carburation since no way it could be timing since it was just running fine.

Car stunk like fuel but no gas was pouring out. good fuel flow.

After about 15 mins of this, I cranked it and it started right up.

Im starting to think it was flooded, but I've never herd of an engine flooding while running.


For disclosure, Im running a weber with a mr gasket fuel pump. Weber is a new unit from a reputable source. Been running it for about a month now with no issue. Only thing I can think that's been different this time around is I had the throttle lever pulled down to a fast idle all day, had it that way to warm up an never brought it back down.
 
hmm where was the spark lever?

What do the plugs look like? They will tell you alot about how the engine is running.

Sounds like this could be repeatable in a driveway if need be (get car hot and set things how you did that day for 10 minutes)

If its the weber downdraft carb i dont think you would see fuel pouring out anyways as i cant think of where fuel would pour from...
 
When I arrived home I pulled a plug. This is what it looked like. Smelled of fuel, but dry.
 

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When I arrived home I pulled a plug. This is what it looked like. Smelled of fuel, but dry.

Hey Christian,
Nice looking plug ! Crème / beige color , IMO, looks great ! Maybe a tad lean/ maybe right on :) ! Sorry, don't know about Webber carb details, but I'd venture to say that....YES, any carb can flood/be flooded ! You did say that you're using an elect fuel pump ? What pressure do you have pump regulated to carb for ? And, what pressure can pump put out ?
If NOT regulated and can pump great pressure..can/will force feed fuel past needle/seat. Otherwise, if you have pump regulated properly, I'd start looking for wet/loose connections first. Good luck
 
Hi guys, I'm using a mr gasket low pressure pump, unregulated. I went with this pump due to its availability and a few guys on here swear by them. After work last night I pulled the carb and manifold off. Both intake ports had pools of fuel in them. I'm thinking either the carb is leaking into the intake or as you mentioned, maybe too much pressure.
 
Hi guys, I'm using a mr gasket low pressure pump, unregulated. I went with this pump due to its availability and a few guys on here swear by them. After work last night I pulled the carb and manifold off. Both intake ports had pools of fuel in them. I'm thinking either the carb is leaking into the intake or as you mentioned, maybe too much pressure.

Web carb is set only for 2-3 of pressure. as per web instructions for this carb set up for Model A. Have fun modelAtony. Lafayette,LA
 
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