No cold start
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Freshman User
Joined: Apr 2009
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No cold start
Hey can someone give me some advice. I have a 81 f250 I6. If I let it sit for a couple of days with out starting, then go to start it the engine will just turn over and not start unless I pour gas down then carb. Then it runs great. Now when I get it started it will turn off and start back up no problem through out the day. What is the deal.
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Freshman User
Joined: Apr 2009
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Ok how do you check to see if the choke is closing? Also is the choke electric or mechanical? There is no wire to it so I assume mechanical? What is an acelerator pump?
Lead Driver
Joined: Dec 2002
Posts: 5,491
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From: Kuna ID
There is a plate on top of the carb that closes to reduce the amout of air, you will need to remove the air cleaner to see it. It's been years since I have seen an I6 carb, but if you dont have an electric choke, it may be controlled by a metal tube coming off the exhaust manifold. As the manifold heats up, the warm air travels up to the choke and allows it to open slowly. The accelerator pump shoot gas into the carb. When you step on the gas the accelerator pumps a stream of gas into the motor. How many times do you pump the pedal when you are starting it cold? When I had my 300, I had to pump that thing 9 times to get it to start.
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Freshman User
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There is a plate on top of the carb that closes to reduce the amout of air, you will need to remove the air cleaner to see it. It's been years since I have seen an I6 carb, but if you dont have an electric choke, it may be controlled by a metal tube coming off the exhaust manifold. As the manifold heats up, the warm air travels up to the choke and allows it to open slowly. The accelerator pump shoot gas into the carb. When you step on the gas the accelerator pumps a stream of gas into the motor. How many times do you pump the pedal when you are starting it cold? When I had my 300, I had to pump that thing 9 times to get it to start.
Never tried to pump the gas before starting only holding it to the floor. Just got this truck so don't know much about it.
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Lead Driver
Joined: Dec 2002
Posts: 5,491
Likes: 16
From: Kuna ID
Next time you try and start it cold, push the pedal all the way to the floor once and let go, then try to start it. One push should set the choke up and dump a little gas in the motor to help fire it up...if everything is working properly. If it happens to fire up for a second then die, do it again. If my truck has been sitting too long I may have to do this 2-3 times before it will stay running. Most motors are going to behave a little differently. If you do the one pump and nothing happens, try pumping it twice and try starting it. The only time you really want to hold the pedal to the floor is if you have flooded the motor with gas, in which case you can usually smell it. Holding the pedal down allows more air into the engine without adding extra gas.
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Freshman User
Joined: Apr 2009
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Next time you try and start it cold, push the pedal all the way to the floor once and let go, then try to start it. One push should set the choke up and dump a little gas in the motor to help fire it up...if everything is working properly. If it happens to fire up for a second then die, do it again. If my truck has been sitting too long I may have to do this 2-3 times before it will stay running. Most motors are going to behave a little differently. If you do the one pump and nothing happens, try pumping it twice and try starting it. The only time you really want to hold the pedal to the floor is if you have flooded the motor with gas, in which case you can usually smell it. Holding the pedal down allows more air into the engine without adding extra gas.
Great thanks for your help. I pump it 5 times and it fires right up.
Postmaster
Joined: Jun 2007
Posts: 2,621
Likes: 1
From: Sweetwater Texas
Just don't tell anyone how to start your truck, I call it the original anti-theft device. My F100 took 3 pumps of the pedal and one more right after she fired up.
BTW, if you end up buying anymore carbed vehicles, 95% benefit from a couple of pumps of the pedal before you start them.
BTW, if you end up buying anymore carbed vehicles, 95% benefit from a couple of pumps of the pedal before you start them.
FTE Legend
Joined: May 2008
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From: In my own world
the check valve in the fuel pump is bad, it allows the carb to drain back to the tank over a period of time. my 82 takes about 2 weeks. when you go to start it it has to fill the carb bowl up 1st. I don't mind it as long as the fuel pump functions properly otherwise. I just pump the heck out of it, while cranking until it starts.
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