Carburetor difficulty:
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Mountain Pass
Joined: Feb 2013
Posts: 132
Likes: 0
From: Southern Arizona
Carburetor difficulty:
Culprit: 1966 Ranchero,200IL 6, Autolite 1100 Carburetor
Problem: When drivingunder hard acceleration, the vehicle runs out of fuel. I can take the fuel capoff and there is a major inrush of air. I can then run for a little whilebefore the problem repeats.
Repairs done: Fueltank removed and cleaned, fuel lines cleaned, filter changed, new vented fuelcap. Fuel pump measured at 6PSI output.
Any suggestions on what to do next?
Super Moderator
Joined: Apr 2004
Posts: 34,507
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OK I see you swapped to a vented fuel cap. All the other stuff should have cleared any issues in the fuel system up to the carb. It is possible that your fuel pump is on it's way out and won't maintain the 6psi, but that is a longer shot than:
Float level in the carb.
Check the carb float level along with the rest of the viewable, checkable, replaceable parts and pieces of the carb. Get a rebuild kit and start your new hobby of carb rebuilding.
It is also possible that the incredible power and torque of the 200 is causing the fuel to stand on it's head in the back of the tank and causing the fuel in the carb and lines to spray back into the tank causing fuel starvation. The oil in the crankcase does the same, along with the windshield washer fluid. Sometimes the soft plugs pop out of the block due to the coolant being forced back. This is possible especially if you have upgraded to tires with more traction than the stock 6.95x14s such as the 7.75x14s.
Float level in the carb.
Check the carb float level along with the rest of the viewable, checkable, replaceable parts and pieces of the carb. Get a rebuild kit and start your new hobby of carb rebuilding.
It is also possible that the incredible power and torque of the 200 is causing the fuel to stand on it's head in the back of the tank and causing the fuel in the carb and lines to spray back into the tank causing fuel starvation. The oil in the crankcase does the same, along with the windshield washer fluid. Sometimes the soft plugs pop out of the block due to the coolant being forced back. This is possible especially if you have upgraded to tires with more traction than the stock 6.95x14s such as the 7.75x14s.
Thread Starter
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Mountain Pass
Joined: Feb 2013
Posts: 132
Likes: 0
From: Southern Arizona
I have rebuilt the carburetor, checked the settings down to decimal points I don't understand. I received another post that suggested I drill an extra hole in the plastic portion of the vented cap. I did this and that seems to allow more air into the system. HOWEVER, after my last test run I still ran out of gas. When inspecting the system I noticed the fuel filter was empty, this was after I had opened the tank to relieve any vacuum, so I will try replacing the fuel pump and see if that is the problem.
Thanks for the quick response and information, I have been fighting this for a couple of months and it is working on frayed patience.
Thanks for the quick response and information, I have been fighting this for a couple of months and it is working on frayed patience.
Super Moderator
Joined: Apr 2004
Posts: 34,507
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Yes, it sounds like the possible problems have been covered--and the problem persists. On a simple system like this one that is frustrating. Might be the pump. Any rubber lines left in the system that could be collapsing?
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
Since the tank has vacuum whenever the the gas cap is removed - you mention hearing an inrush of air - then the cap must be defective. Fuel pump pressure is about right, check volume too though. Should be at least 1 pint in 30 seconds.
Hotshot
Joined: Feb 2015
Posts: 17,559
Likes: 1,081
From: Central Delaware
If you have checked everything else and it's still happening, you are kinda stuck with the pump. Is the a intake and an exit filter on your pump? Have they/has it been replaced? Is there another filter at the carb connection? Has it been replaced?
Is it mechanical or electric pump? Usually a mechanical pump will let you know there is an issue because it will pump gas out the bleed hole in the side of the pump.
Is it mechanical or electric pump? Usually a mechanical pump will let you know there is an issue because it will pump gas out the bleed hole in the side of the pump.
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Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
Why would the OP swap in a vented fuel cap since this was the only type of cap used thru 1969?
The only reason a NON vented cap would be in place, if it was a 1970 with the Evaporative Emission system, and even then, not all states required it.
Plus, a 1970 vented or non vented fuel cap will not fit a 1964/65 Ranchero. Neither will any other year besides 1964/65.
1964/65 Ranchero's used several different versions of gas caps, because the cap is located on the left quarter panel and some had body side mouldings.
The 1965 cap used with side mouldings has a moulding on it (C5DZ-9030-B). No side mouldings, the cap is a "plain jane" type (C4DZ-9030-C).
These two fuel caps are the same 1964/65: Falcon Ranchero, Falcon station wagons and the Falcon sedan delivery.
These two caps were very hard to find for decades. Everyone w/a Ranchero or wagon wanted one, none could be found.
Today, I dunno if either type is reproduced.
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Cargo Master
Joined: Mar 2002
Posts: 3,132
Likes: 219
From: W (BY GOD) V
Why would the OP swap in a vented fuel cap since this was the only type of cap used thru 1969?
The only reason a NON vented cap would be in place, if it was a 1970 with the Evaporative Emission system, and even then, not all states required it.
Plus, a 1970 vented or non vented fuel cap will not fit a 1964/65 Ranchero.
Neither will any other year besides 1964/65.
He has a 1966 Bill, or are you reading something I missed again...
Cargo Master
Joined: Mar 2002
Posts: 3,132
Likes: 219
From: W (BY GOD) V
I have rebuilt the carburetor, checked the settings down to decimal points I don't understand. I received another post that suggested I drill an extra hole in the plastic portion of the vented cap. I did this and that seems to allow more air into the system. HOWEVER, after my last test run I still ran out of gas. When inspecting the system I noticed the fuel filter was empty, this was after I had opened the tank to relieve any vacuum, so I will try replacing the fuel pump and see if that is the problem.
Drive the cars w/o the filler cap and see what happens. DO NOT throw a cigarette out the window.
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
There may be more than one problem with fuel delivery to the carb here, that would not be unusual.
However, if the fuel tank is still building a partial vacuum as described in the first post, that will do it. Every time.
However, if the fuel tank is still building a partial vacuum as described in the first post, that will do it. Every time.
Thread Starter
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Mountain Pass
Joined: Feb 2013
Posts: 132
Likes: 0
From: Southern Arizona
OK, an update;
I have corrected the vented cap problem, removed and cleaned the fuel tank, cleaned the fuel lines, corrected a vacuum leak, replaced the fuel pump. I have driven the vehicle without a gas cap and everything else I can think of, still runs out of fuel, not as quickly but...............
Does anyone have a suggestion on where I should look at next. I plan to go through the carburetor again I a little while.
I have corrected the vented cap problem, removed and cleaned the fuel tank, cleaned the fuel lines, corrected a vacuum leak, replaced the fuel pump. I have driven the vehicle without a gas cap and everything else I can think of, still runs out of fuel, not as quickly but...............
Does anyone have a suggestion on where I should look at next. I plan to go through the carburetor again I a little while.
Thread Starter
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Mountain Pass
Joined: Feb 2013
Posts: 132
Likes: 0
From: Southern Arizona
Mid afternoon it gets in the mid 90s, this morning when I had the latest issue upper 60s. I addressed the vapor locking problem earlier, spacer between the carb and manifold, wooden clothespins on the fuel line and everything else I can think of.