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Fuel bowl draining.
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DRR Pro
Picture of RacerVX54
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So getting the car ready for the year finishing up a few thinks. Noticed my rear fuel bowl draining as soon as the motor is shut off. It is draining into the intake Alky carb thats is 12 years old Pro system sv-1. Metering gaskets look fine. What else would cause this. Think maybe a crack or something in the metering block itself...Planning on sending it in for a over haul at this point. Its been a great carb.. I am really scared to touch it honestly the car has been deadly.


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Brian Martin
Martin Racing
5.66 @121.55
 
Posts: 1378 | Location: Va.Beach .Va | Registered: August 03, 2005Reply With QuoteReport This Post
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Have you gone through the carb as part of your off season maintenance? Every off season my carbs get stripped, cleaned, all passages blown out, N&S removed and all gaskets replaced. I also verify the floats are good and check their set. If you haven’t done this, start there.
 
Posts: 13522 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
DRR Pro
Picture of RacerVX54
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opps post in wrong section. Ed have not done this season.Went thru it before last season new floats needle seat ect.


"Just Shut Up and Race"

Brian Martin
Martin Racing
5.66 @121.55
 
Posts: 1378 | Location: Va.Beach .Va | Registered: August 03, 2005Reply With QuoteReport This Post
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If it’s dumping fuel in while running floats…I change alky floats 2 to 3 times a year
 
Posts: 1246 | Location: USA | Registered: December 04, 2008Reply With QuoteReport This Post
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Picture of RacerVX54
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quote:
Originally posted by WHOMPWHOMP:
If it’s dumping fuel in while running floats…I change alky floats 2 to 3 times a year


Its not dumping it draining when you kill the motor. You can watch the float draining the sight glass


"Just Shut Up and Race"

Brian Martin
Martin Racing
5.66 @121.55
 
Posts: 1378 | Location: Va.Beach .Va | Registered: August 03, 2005Reply With QuoteReport This Post
DRR Pro
Picture of Alaskaracer
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I'd pull the carb off, clean the outside really good, and put it on a stand so you can watch the underside of it. Fill the float bowls with fuel and watch....if it's draining that fast, you'll find it quick...


Mark Goulette
Owner/Driver of the Livin' The Dream Racing dragster
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Posts: 1463 | Location: Back home in Alaska! | Registered: February 13, 2011Reply With QuoteReport This Post
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quote:
Originally posted by RacerVX54:
So getting the car ready for the year finishing up a few thinks. Noticed my rear fuel bowl draining as soon as the motor is shut off. It is draining into the intake Alky carb thats is 12 years old Pro system sv-1. Metering gaskets look fine. What else would cause this. Think maybe a crack or something in the metering block itself...Planning on sending it in for a over haul at this point. Its been a great carb.. I am really scared to touch it honestly the car has been deadly.


Does it have a rear power valve?
 
Posts: 2131 | Location: Tewksbury, MA,USA | Registered: November 03, 2000Reply With QuoteReport This Post



DRR Pro
Picture of RacerVX54
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quote:
Originally posted by TOP38:
quote:
Originally posted by RacerVX54:
So getting the car ready for the year finishing up a few thinks. Noticed my rear fuel bowl draining as soon as the motor is shut off. It is draining into the intake Alky carb thats is 12 years old Pro system sv-1. Metering gaskets look fine. What else would cause this. Think maybe a crack or something in the metering block itself...Planning on sending it in for a over haul at this point. Its been a great carb.. I am really scared to touch it honestly the car has been deadly.


Does it have a rear power valve?



No


"Just Shut Up and Race"

Brian Martin
Martin Racing
5.66 @121.55
 
Posts: 1378 | Location: Va.Beach .Va | Registered: August 03, 2005Reply With QuoteReport This Post
DRR Sportsman
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if it has a rear PV plug in the metering block, check to see if it's tight and the gasket is good.
 
Posts: 469 | Location: BENTON HARBOR, MI | Registered: August 29, 2007Reply With QuoteReport This Post
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Accelerator pump leaking? Mine was leaking on the front to end the season. The bowl would empty in between nights of racing. They are cheap and easy to replace.
 
Posts: 70 | Location: Sliding at the cones | Registered: May 26, 2009Reply With QuoteReport This Post
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quote:
Originally posted by RacerVX54:
quote:
Originally posted by TOP38:
quote:
Originally posted by RacerVX54:
So getting the car ready for the year finishing up a few thinks. Noticed my rear fuel bowl draining as soon as the motor is shut off. It is draining into the intake Alky carb thats is 12 years old Pro system sv-1. Metering gaskets look fine. What else would cause this. Think maybe a crack or something in the metering block itself...Planning on sending it in for a over haul at this point. Its been a great carb.. I am really scared to touch it honestly the car has been deadly.


Does it have a rear power valve?



No


As stated above check the PV plug gasket and also the metering block gasket.
 
Posts: 2131 | Location: Tewksbury, MA,USA | Registered: November 03, 2000Reply With QuoteReport This Post
DRR Top Comp
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Take the carb off but leave the fuel line connected (assuming it's a hose and not hardline) Fill the bowl and look under the carb and see where it's leaking from.
Why keep guessing?


.
Dave



F J B

 
Posts: 4436 | Location: Earth | Registered: February 08, 2006Reply With QuoteReport This Post
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Possible rear bowl vent plugged?
 
Posts: 290 | Location: Nevada | Registered: February 01, 2009Reply With QuoteReport This Post
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Many years ago I had a pair of 3-circuit Dominators that leaked through the intermediate tubes profusely, some guy I think named Marvin at Holley sent me 4 new metering blocks, problem solved, to this day the best performing carburetors as a single or a pair I have ever seen.


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Posts: 1570 | Location: Indy | Registered: November 21, 2008Reply With QuoteReport This Post



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quote:
Originally posted by DLR:
if it has a rear PV plug in the metering block, check to see if it's tight and the gasket is good.


X2. It will also drip at idle making the idle sloppy.


Matt Ward



 
Posts: 1389 | Location: South Carolina | Registered: March 20, 2004Reply With QuoteReport This Post
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Float is set too high, or oring on needle and seat is hard
 
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Did you get issue resolved?


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Posts: 3941 | Location: United States of Texas | Registered: April 02, 2011Reply With QuoteReport This Post
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quote:
Originally posted by Curly1:
Did you get issue resolved?


Power block off was good gasket was good. Talked to Patrick thinking corrosion or something else with the metering block. Carb is 12 years old and its been a good piece sent it in for updates and rebuild.


"Just Shut Up and Race"

Brian Martin
Martin Racing
5.66 @121.55
 
Posts: 1378 | Location: Va.Beach .Va | Registered: August 03, 2005Reply With QuoteReport This Post
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Good choice, he’ll make it right
 
Posts: 13522 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
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quote:
Originally posted by RacerVX54:
quote:
Originally posted by Curly1:
Did you get issue resolved?


Power block off was good gasket was good. Talked to Patrick thinking corrosion or something else with the metering block. Carb is 12 years old and its been a good piece sent it in for updates and rebuild.


I missed the alky fuel, if the metering blocks were machine after anodizing, meaning bare metal internal passages, it's like one corroded into another causing the leak. He is probably using billet blocks now and they should be machine first and then anodized. I ran alky for a while and it will do a number on areas with flowing fuel vs just sitting in a fuel tank. Anodizing is not a cure all also but it will increase the life span. Top end lube can also help.
 
Posts: 2131 | Location: Tewksbury, MA,USA | Registered: November 03, 2000Reply With QuoteReport This Post
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