carb

Blackgar · 09-15-2020, 10:32 PM

Jim if you're talking about dripping after you shut the motor off you just aren't turning your fuel pump off early enough before you shut the motor off in this hot weather. If you are talking about with the engine running either your float level is too high, or your fuel pressure guage is not right

Larry Hill · 09-16-2020, 07:22 AM

Is the mounting surface level on intake side to side?

Ralph A Powell · 09-16-2020, 08:06 AM

Change both gaskets float bowl side and main body side also replace the the 4 bowl screw gaskets and torque the the bowl screws to 35 in-pounds and your problem should go away.

NORMAN BARNARD · 09-16-2020, 11:00 AM

power valve hitting the base plate screw "boss" in the vac. chamber not allowing the m/block gasket to seal to the venturi surface. this is a common problem with "older" venturi's. check a new venturi an you'll see what i mean..

this is also made worse if you are using the new non-compressible p/valve gasket with a mill'd surface of the venturi as they become closer together.

Daran Summerton · 09-16-2020, 11:27 AM

o ring on needle and seat

Jim Hanig · 09-17-2020, 01:32 PM

Quote:

Originally Posted by Blackgar

Jim if you're talking about dripping after you shut the motor off you just aren't turning your fuel pump off early enough before you shut the motor off in this hot weather. If you are talking about with the engine running either your float level is too high, or your fuel pressure guage is not right

No the fuel only comes out when the engine is running, some one suggested check the air bleeds . I did that and that seemed to fix it. Thank for the help.

Chevy55 · 09-17-2020, 07:36 PM

Also check the needle and seat, I've had debris stick in there and prevented it from sealing.

FED 387 · 09-17-2020, 09:27 PM

HSAB plugged or maybe you have the bowl gasket or metering plate gasket installed incorrectly OR you have the wrong gaskets to start with---a symptom of definitely siphoning fuel out

FED 387 · 09-20-2020, 05:20 PM

Not sure if you wrote "its solved" but you can run the engine up to about 2500RPM and put a gloved hand or towel over the carb top when the engine has almost died remove your hand or the towel and let the RPM come back up---do this 2-3 times and see if it clears up ---what you are doing is going from vacuum to siphoning and jostling any particles that may been the bleeds or the idle passages--kinda self cleaning or sloshing process by going back and forth

ss3011 · 09-18-2020, 08:21 AM

Quote:

Originally Posted by Jim Hanig

No the fuel only comes out when the engine is running, some one suggested check the air bleeds . I did that and that seemed to fix it. Thank for the help.

Was one or more of the air bleeds plugged up ?

09-15-2020, 10:32 PM	#1
Blackgar Member Join Date: Feb 2005 Location: San Antonio Posts: 119 Likes: 1 Liked 48 Times in 18 Posts	Re: carb Jim if you're talking about dripping after you shut the motor off you just aren't turning your fuel pump off early enough before you shut the motor off in this hot weather. If you are talking about with the engine running either your float level is too high, or your fuel pressure guage is not right

09-16-2020, 07:22 AM	#2
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,627 Likes: 1,917 Liked 10,676 Times in 2,220 Posts	Re: carb Is the mounting surface level on intake side to side? __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817

09-16-2020, 08:06 AM	#3
Ralph A Powell Member Join Date: Oct 2017 Location: Bay City Texas Posts: 387 Likes: 2 Liked 225 Times in 136 Posts	Re: carb Change both gaskets float bowl side and main body side also replace the the 4 bowl screw gaskets and torque the the bowl screws to 35 in-pounds and your problem should go away.

09-16-2020, 11:00 AM	#4
NORMAN BARNARD Member Join Date: Mar 2006 Location: EL PASO, TEXAS Posts: 156 Likes: 0 Liked 2 Times in 2 Posts	Re: carb power valve hitting the base plate screw "boss" in the vac. chamber not allowing the m/block gasket to seal to the venturi surface. this is a common problem with "older" venturi's. check a new venturi an you'll see what i mean.. this is also made worse if you are using the new non-compressible p/valve gasket with a mill'd surface of the venturi as they become closer together.

09-16-2020, 11:27 AM	#5
Daran Summerton Senior Member Join Date: Jun 2003 Location: Las Vegas nv Posts: 600 Likes: 18 Liked 66 Times in 37 Posts	Re: carb o ring on needle and seat __________________ 72 cutlass

09-17-2020, 07:36 PM	#7
Chevy55 Banned Join Date: Nov 2014 Posts: 324 Likes: 625 Liked 179 Times in 89 Posts	Re: carb Also check the needle and seat, I've had debris stick in there and prevented it from sealing.

09-17-2020, 09:27 PM	#8
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,416 Likes: 519 Liked 330 Times in 178 Posts	Re: carb HSAB plugged or maybe you have the bowl gasket or metering plate gasket installed incorrectly OR you have the wrong gaskets to start with---a symptom of definitely siphoning fuel out

09-20-2020, 05:20 PM	#9
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,416 Likes: 519 Liked 330 Times in 178 Posts	Re: carb Not sure if you wrote "its solved" but you can run the engine up to about 2500RPM and put a gloved hand or towel over the carb top when the engine has almost died remove your hand or the towel and let the RPM come back up---do this 2-3 times and see if it clears up ---what you are doing is going from vacuum to siphoning and jostling any particles that may been the bleeds or the idle passages--kinda self cleaning or sloshing process by going back and forth