Carb question: dripping fuel on shut off....

[BattlestarGalactic]

Something I can check into.  I have a digital gram scale that I use for my clutch tuning parts.   I have jet extension on the wagon and have cut the heck out of those black floats with NO ill effects.

Though, like I mentioned, the fuel never comes out the float sight hole.  Even when running or shut off.  Motor runs flawlessly, idles perfect.  It somehow drains the bowl, that is why I'm trying to figure out what passage from the bowl would allow that to happen.  I did try another PV and NEW gasket which had no improvement.  I have the carb torn down and will get all new parts.

Once I get a new gasket kit I am going to fill the bowls and mount the carb high enough to witness any fuel dripping from the bores.  If nothing, then I'll put it on the truck and retest it.  Just have to start it, maybe let it run for 30 seconds and shut it off.

[HarleyJack17]

Doubt this is it, but have you made sure the vent on the tank is good? I had one that would get warm and pressurize the fuel system. Fought it until I figured it out one day....may tank had so much pressue I had to wait for dark to get the cap off and when I did...whoooosh, pop went the tank.  The shoddy parts store cap had a bad spring in it or something. My tooth pic wedge is still in it 10 years later.

Again I doubt this is it, but it is easy to just crack the cap and see what happens.

[wayne]

I get most all my carb parts online from Walker carb the new web site can be a pain but when you get to high performance parts.You will be ok  they have all the parts you cant find anywhere.I like to buy just what i use and dont half to pay for a kit.

[BattlestarGalactic]

Doubt this is it, but have you made sure the vent on the tank is good? I had one that would get warm and pressurize the fuel system. Fought it until I figured it out one day....may tank had so much pressue I had to wait for dark to get the cap off and when I did...whoooosh, pop went the tank.  The shoddy parts store cap had a bad spring in it or something. My tooth pic wedge is still in it 10 years later.

Again I doubt this is it, but it is easy to just crack the cap and see what happens.

I run a fuel cell in the bed of the truck.  It has a roll over valve, so it is vented.   I also run 2x4 intake and I only have issue with one carb, so that eliminates that. 

Thanks for the input.  I know I've seen venting issues on stock tanks before.

I get most all my carb parts online from Walker carb the new web site can be a pain but when you get to high performance parts.You will be ok  they have all the parts you cant find anywhere.I like to buy just what i use and dont half to pay for a kit.

Having Summit Racing just minutes away I just get stuff there for the most part since I don't have to wait for delivery.  I used to buy just bowl gaskets and metering plate gaskets separately, but many times I need a PV and gasket or base plate gasket so I just buy the cheaper strip kit for $33 and get a nice selection of extra parts(like bowl screw gaskets and needle/seat gaskets).  I get regular Summit bucks for $15 or so and that helps pay for the little stuff like this.

[wayne]

We stopped their on the way home from the fe reunion nice place butt hard on the wallet to many deals.

[shady]

I once  used a blue gasket from a QF kit and had problems. Got a Holley gasket and problem solved. Really went round and round on that one. Same carb as yours.

[wayne]

Don terrills speedtech  speed talk . com forum  holley gurus id a leaking port please  this site may help some of you out.

[BattlestarGalactic]

We stoped their on the way home from the fe reunion nice place butt hard on the wallet to many deals.

I'm about 15 minutes south of Akron store.  I peruse the return tables looking for bargains, though I don't make a regular trip up there.  I've gotten some smokin' deals on stuff but there is a crowd that makes regular stops first thing in the morning to scoop up anything real good(A friend of mine is one).  He has a speed shop in his basement from all the stuff he has bought on the junk table). 

I once  used a blue gasket from a QF kit and had problems. Got a Holley gasket and problem solved. Really went round and round on that one. Same carb as yours.

I've learned years ago, ONLY Holley parts/gaskets.

[gt350hr]

  Larry ,
      One thing I was told to do after I modified "side hung " floats was to weigh the float before and after. My carb modifier friend said I should add bb's to the modified float ( or epoxy) to restore the original weight. The "light" float was "too" sensitive and messed with the fuel level in the bowl. I "corrected" mine and it made a difference.
   Randy

[BattlestarGalactic]

Interesting.  The ones in the truck carbs are stock plastic.  The wagons are cut up pretty badly for the extensions but has had no ill effects.