rodchester flooding

[stevegin]

I have a 88 regal with a 488 190hp mercruiser.

My problem is the carb is flooding over. Every time you start it about 5 seconds later you can watch gas flood out the top of the carb. I rebuild it and it did the same thing. I bought a brand new one it does the same thing. This one has me baffled. I have 3 fuel filters none them have a spec of dirt in them. It has a stock fuel pump on it. I changed it also, same thing. Anybody have any ideas??

 

[THE BEEF]

Re: rodchester flooding

Rebuilding the carb ,did you change the float from plastic to brass?
The plastic ones can get saturated with gas and cause all sorts of problems.
As far as the new carb, I would check the float setting.
Just a thought
Goodluck, Beef

 

[maxxman04]

Re: rodchester flooding

agreed. either float isn't set right, or wrong needle/seat. could simply be a small piece of debris in the seat. something the size of a speck of sand is all it takes. i assume mechanical fuel pump (i assume), so fuel pressure SHOULD be good, double check tho.

 

[VMAX]

Re: rodchester flooding

My boat has the same problem. (1984 Searay 5.0 with quadrajet) Only happens when warmed up, and needle and seat, and float have been replaced, and float level checked, several times. Isn't it possible for the fuel system to over-pressurize due to a restricted tank vent?
I'm going to put a gauge in the fuel line to check this. I suppose that an indirect test would be to crack the fuel fill cap after shutoff to see if the problem goes away. I have been a chevy mechanic for 25 years, and I have never seen a quadrajet on an automobile which would consistently flood only after hot shut-off, and restart. When my boat does this, the volume of excess fuel which flows out the nozzles is waaaay too much to attribute to percolation. Also, the engine usually starts normally, indicating a good mixture, and then floods a few seconds later, as if once the needle opens, it can't shut off the flow. I will post any information or solution that I find.
John

 

[Greg Gessler]

Re: rodchester flooding

Brass floats can also leak, so be sure to check. Place brass float in hot water and look for air bubles coming from the soldered seam. Hot water causes air to expand, so Its easy to see a leaker.