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Carb problem or something else #1736483 01/22/15 08:31 PM 01/22/15 08:31 PM
Joined: May 2005 Posts: 272 Waterloo, Wi J joedee OP enthusiast
joedee OP enthusiast J Joined: May 2005 Posts: 272 Waterloo, Wi	Hi, Went to start the 440 and had to use starting fluid to get it to fire. Looks like hardly any gas was coming to the carb. Then let it sit overnight and the fuel filter was empty again. Why would the gas drain back? Now it will take forever to get it started again. Thank you Joe

Re: Carb problem or something else [Re: joedee] #1736484 01/22/15 08:35 PM 01/22/15 08:35 PM
Joined: Jan 2003 Posts: 32,964 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,964 Grand Prairie,Texas	Bad fuel pump most likely. I would use gas to start rather than starter fluid. That stuff is hard on an engine.

Re: Carb problem or something else [Re: joedee] #1736485 01/22/15 09:36 PM 01/22/15 09:36 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	recent problem? chronic problem? first thing I'd do is before I crank it, take off the air cleaner and look in the air horn & pull the throttle & see if you have several healthy squirts of gas from the nozzle live every 24 hour block of time like it's your last day on earth

Re: Carb problem or something else [Re: RapidRobert] #1736486 01/23/15 01:54 PM 01/23/15 01:54 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	Gas drains back because there is a bad valve in the fuel pump. Replace the pump. R.

Re: Carb problem or something else [Re: dogdays] #1736487 01/23/15 01:57 PM 01/23/15 01:57 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Quote: Gas drains back because there is a bad valve in the fuel pump. Replace the pump. R. I suggest you look up the siphon effect then explain to us how gas in the carb bowl jumps the air gap above it to go back to the tank. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: Carb problem or something else [Re: Supercuda] #1736488 01/24/15 12:20 AM 01/24/15 12:20 AM
Joined: Jan 2003 Posts: 42,714 Spokane Washington ScottSmith_Harms Mr Wizzard
ScottSmith_Harms Mr Wizzard Joined: Jan 2003 Posts: 42,714 Spokane Washington	Quote: Carb problem or something else Something else

Re: Carb problem or something else [Re: joedee] #1736489 01/24/15 07:57 AM 01/24/15 07:57 AM
Joined: Feb 2010 Posts: 18,493 Granite Bay CA Kern Dog Striving for excellence
Kern Dog Striving for excellence Joined: Feb 2010 Posts: 18,493 Granite Bay CA	ThermoQuads do this. These carbs are great when they are in good condition. Great mileage, great performance, but after years of operation, the Phenolic center warps and the seals at the base leak. Fuel doesn't just evaporate overnight, it slowly drips out and into the manifold. I have had this happen with several seasoned ThermoQuads. All the Holley carbs I've had seem to retain fuel for several weeks. One of the reason that Holley type carbs start easier is because the accelerator pumps on Holleys are at the bottom of the fuel bowl. Even if the carb is down to 1/4" of fuel and the main jets are uncovered, the car can start. Carter based carbs like the AVS, AFB and ThermoQuad have a well for the accelerator pump off to the side. They are harder to start once the fuel level drops. You'll need to respond with more info to get a more detailed suggestion.

Re: Carb problem or something else [Re: Supercuda] #1736490 01/24/15 03:14 PM 01/24/15 03:14 PM
Joined: Jan 2003 Posts: 32,964 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,964 Grand Prairie,Texas	Quote: Quote: Gas drains back because there is a bad valve in the fuel pump. Replace the pump. R. I suggest you look up the siphon effect then explain to us how gas in the carb bowl jumps the air gap above it to go back to the tank. If you read his original post you will see he said the fuel filter was empty.

Re: Carb problem or something else [Re: stumpy] #1736491 01/24/15 03:26 PM 01/24/15 03:26 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	Still wouldn't stop the fuel in the carb bowl from starting the engine. Empty fuel filters are fairly common. They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.

Re: Carb problem or something else [Re: Supercuda] #1736492 01/24/15 05:51 PM 01/24/15 05:51 PM
Joined: Jan 2003 Posts: 512 Niwot, CO Formerly denn... dynorad mopar
dynorad mopar Joined: Jan 2003 Posts: 512 Niwot, CO Formerly denn...	Many times engine heat will evaporate the fuel in the carb. I would have the same problem if it weren't for the electric pump I'm using.

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