Cold start problem
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5th Wheeling
Joined: Jul 2009
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Cold start problem
My apologies if this has been covered before!
I have a 1982 F250 with a 351W and stock 2-barrel carb. Over the past couple months the truck has been getting progressively harder to start once it has sat for a day or more. Once warmed up it restarts nicely. It seems like its getting flooded. I had some success propping open the choke plate, but yesterday not even this trick would work. I have not attempted any adjustments to the carb/choke system. When cold the choke plate is closed like I would expect. The way it behaves is that when cranked it attempts to start initially but doesn't. After the first unsuccessful crank it shows no sign of firing. It sure sounds and behaves like a choke problem, but might be ignition too. Looking for any pointers.
Thanks!
I have a 1982 F250 with a 351W and stock 2-barrel carb. Over the past couple months the truck has been getting progressively harder to start once it has sat for a day or more. Once warmed up it restarts nicely. It seems like its getting flooded. I had some success propping open the choke plate, but yesterday not even this trick would work. I have not attempted any adjustments to the carb/choke system. When cold the choke plate is closed like I would expect. The way it behaves is that when cranked it attempts to start initially but doesn't. After the first unsuccessful crank it shows no sign of firing. It sure sounds and behaves like a choke problem, but might be ignition too. Looking for any pointers.
Thanks!
Elder User
Joined: Feb 2013
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Observe the choke for starters (no pun intended).
With the key off push the gas pedal to the floor on a cool morning.
Go look to ck the choke plate...it should now be COMPLETELY shut.
Crank it for maybe 5 seconds.
If no start, go observe the choke again. The cranking should have opened the plate just a little....maybe 1/4 inch opening max.
If all that looks ok, thats a start.
Another test...with the air cleaner off and key off, stick your face into the carb opening and pump the throttle linkage....you should see/hear gas squirting, maybe some misty vapor too. That is necessary to get a good starting point for the engine to start. If no squirting, report back. That's a problem.
With the key off push the gas pedal to the floor on a cool morning.
Go look to ck the choke plate...it should now be COMPLETELY shut.
Crank it for maybe 5 seconds.
If no start, go observe the choke again. The cranking should have opened the plate just a little....maybe 1/4 inch opening max.
If all that looks ok, thats a start.
Another test...with the air cleaner off and key off, stick your face into the carb opening and pump the throttle linkage....you should see/hear gas squirting, maybe some misty vapor too. That is necessary to get a good starting point for the engine to start. If no squirting, report back. That's a problem.
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5th Wheeling
Joined: Jul 2009
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Okay. I observed more tonight. I went to start it and it did exactly as described before. I then looked into the carb and moved the linkage to get gas to squirt. It did not. I then switched the tank selector from the rear (which has over a half tank and the gauge is working) to the front tank. Cranked it again for a minute and it fired right up, just like to is supposed to. Then while running I switched the tank selector back to the rear tank and it continued running just fine.
So what I observed is that it will not start rear tank. But will run once started on the rear tank. Also, it will start and continue running on the front tank.
Am I chasing a ghost, or is this something real?
So what I observed is that it will not start rear tank. But will run once started on the rear tank. Also, it will start and continue running on the front tank.
Am I chasing a ghost, or is this something real?
Elder User
Joined: Feb 2013
Posts: 608
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Maybe you can live with that routine?
I do know not getting gas to squirt down the throat of the carb is working against you. You could test what I'm saying. With a cold engine off. open the choke flapper and spray some Engine Starter down the carb throat, then set the choke closed. It should fire right up immediately. If it does, it proves your weak link is the lack of squirting gas.
I do know not getting gas to squirt down the throat of the carb is working against you. You could test what I'm saying. With a cold engine off. open the choke flapper and spray some Engine Starter down the carb throat, then set the choke closed. It should fire right up immediately. If it does, it proves your weak link is the lack of squirting gas.
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