|
|
09-15-2020, 08:21 PM | #1 |
Senior Member
Join Date: Aug 2006
Location: Pukwana SD
Posts: 858
Likes: 555
Liked 97 Times in 47 Posts
|
carb
I have a 780 holley carb that has fuel coming through 1 booster, check the float change the gaskets 6 pounds of fuel pressure. the carb run fine till i put it back on the stocker motor. Changed the carb to another 780 it ran fine till i shut the motor down then restarted it ,same thing. Any guesses?
|
09-15-2020, 09:04 PM | #2 | |
Member
Join Date: Jul 2015
Posts: 354
Likes: 62
Liked 238 Times in 93 Posts
|
Re: carb
Quote:
|
|
Liked |
09-15-2020, 10:29 PM | #3 |
Senior Member
Join Date: Aug 2006
Location: Pukwana SD
Posts: 858
Likes: 555
Liked 97 Times in 47 Posts
|
Re: carb
I did check that and also changed the float ,the old float weight 14 grams new one 15 grams. it only slubbers fue out of one booster, changed the needle and seat. I Never had this happen in 40 years of holley carbs.
|
09-15-2020, 10:32 PM | #4 |
Member
Join Date: Feb 2005
Location: San Antonio
Posts: 112
Likes: 1
Liked 37 Times in 14 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 | #5 |
Live Reporter
Join Date: Oct 2004
Location: Hickory, Ky
Posts: 10,278
Likes: 1,636
Liked 9,456 Times in 1,957 Posts
|
Re: carb
Is the mounting surface level on intake side to side?
|
09-16-2020, 08:06 AM | #6 |
Member
Join Date: Oct 2017
Location: Bay City Texas
Posts: 357
Likes: 1
Liked 202 Times in 123 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 | #7 |
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. |
Liked |
09-17-2020, 01:32 PM | #8 | |
Senior Member
Join Date: Aug 2006
Location: Pukwana SD
Posts: 858
Likes: 555
Liked 97 Times in 47 Posts
|
Re: carb
Quote:
|
|
09-17-2020, 07:36 PM | #9 |
Member
Join Date: Nov 2014
Posts: 304
Likes: 606
Liked 167 Times in 83 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 | #10 |
VIP Member
Join Date: Jun 2006
Posts: 3,349
Likes: 328
Liked 280 Times in 150 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
|
|
|