Carburetor problems
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Senior User
Joined: Aug 2012
Posts: 113
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From: Phoenix
Carburetor problems
I have a rebuilt holley 1904 on my 223 inline six (I hate this carb). When it starts cold, with a bit of choke it fires right up. My problem is that I live in Phoenix and the daytime temp ranges from 104-119(yes that really happened last week). When I stop the truck go inside from 15-45 minutes she is flooded out and very difficult to start if not needing 3 or 4 attempts. The engine is really smelling of gas and puts out some smoke when finally started. My best success comes when I pull the air cleaner off and start it with a naked carb. I have heard about heat transfer with these engines and carbs and boiling the gas causing this problem. Any thoughts or experiences with this problem? Is there a needle sticking maybe? I'm not real carb savvy just yet.
Senior User
Joined: May 2012
Posts: 136
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From: Michigan
Carburetor problems
Tyrantsparky,
I have the same carb in my 62 F100 Stepside. I don't have the heat problem but then I live in North Carolina. There should be at least 6 flange gaskets between the carb and the intake mount. Here is the place I bought mine.
Holley 1904 Flange Gasket
Hope this helps your problem.
Cazman
I have the same carb in my 62 F100 Stepside. I don't have the heat problem but then I live in North Carolina. There should be at least 6 flange gaskets between the carb and the intake mount. Here is the place I bought mine.
Holley 1904 Flange Gasket
Hope this helps your problem.
Cazman
Cargo Master
Joined: Oct 2005
Posts: 2,084
Likes: 94
From: Stanton, Michigan, USA
Yep, the underhood temps are too hot for your fuel. You need to try to insulate the fuel lines and maybe even route the fuel line through a ice/water heat exchanger (an old racer's trick - Moroso Fuel Cool Can - Fuel Coolers ). You might want to also consider adding a fuel additive to your fuel - such as: Lucas Fuel Treatment : Lucas Oil - although it doesn't make a claim to help with vapor lock conditions specifically, it may help.
This issue is steadily becoming more and more of a problem with older, carburetor-equipped vehicles, not because the vehicles are old, but because the gasoline they make nowadays has been modified to the point that our old Detroit iron beasts of burden are NOT happy with it.
Earlier today I decided to order some of the above additive and will start using it in my old FE-powered '65 trucks and small engine machines that are not happy with today's fuel. I look at it as just an added cost to running these old beasts, which is still less expensive than newer vehicles & equipment........
BarnieTrk
Cargo Master
Joined: Jul 2006
Posts: 3,014
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From: Concord, CA
Fuel and heat don't mix well. Over the weekend I filled the Dodge up. I don't like the placement of the filler tube by Dodge. The bottom of the tube is level with the top of the tank. So guess what happens when full, on just a slight incline and warm weather?
I just spent an hour outside carefully opening the cap as there was a drip. A slight turn and the pressure released sprayed me with fuel. Back on with the cap and just cracked it enough to allow fuel to fill a clean oil pan. By the time it stopped I took out 1 1/4 gallons due to expansion.
I just spent an hour outside carefully opening the cap as there was a drip. A slight turn and the pressure released sprayed me with fuel. Back on with the cap and just cracked it enough to allow fuel to fill a clean oil pan. By the time it stopped I took out 1 1/4 gallons due to expansion.
Elder User
Joined: Jun 2012
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Your most likely problem is the gas tank is being over pressured by expansion. Remove the vacume breaker inside the cap or get a cap that vents outward to atmosphere..... this can be a very bad problem. I have seen heat expansion push 2 1/2 gallons or so gas into the carb through the open valves, past the piston rings and into the oil pan to leak out the front seal....
In regards to the carb,,,,,
Vapor lock does not cause flooding....
A rebuilt carb does not mean it is done right....
Mosty likely is the float level setting or leaking float valve which may just need cleaning. The heat may be causing the valve to leak by due to seat expansion.... that would not be likely as that area should be vented to atmosphere but can explain the diff in cold and hot if the vents are closed off.
In regards to the carb,,,,,
Vapor lock does not cause flooding....
A rebuilt carb does not mean it is done right....
Mosty likely is the float level setting or leaking float valve which may just need cleaning. The heat may be causing the valve to leak by due to seat expansion.... that would not be likely as that area should be vented to atmosphere but can explain the diff in cold and hot if the vents are closed off.
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