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Need Help With 79 Ford F250 Truck.


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Old 08-08-2011, 06:48:02 PM
DougM DougM is offline
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Default Need Help With 79 Ford F250 Truck.

I have been experiencing a problem with my 1979 Ford F250 truck for 3 years and I am getting sick of the problem. The truck has a 400 cid engine with the model 2150 two barrel carb.

The problem is that if the truck sits more than 8 hours it will not start. Even if I pump the accelerator several times to pump gas into the carb, the engine will not start. I have to pour gas into the carb and then the engine will start.

My local mechanic has taken the carb off of the engine and has let it sit overnight on a bench. There is still gas in the carb the next day. So he is confident that the gas is not leaking out of the carb. He has done this two different occasions.

Does anyone have any ideas what might be causing the problem?

Lately I have been experiencing a second problem. When the truck is idling, the engine will die. The engine will start right up. Any ideas what might be causing this problem?

Thank you in advance for your help.
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Old 08-08-2011, 07:10:56 PM
oldproff oldproff is offline
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Default Re: Need Help With 79 Ford F250 Truck.

sounds like something in the acceleration system or choke system. Strip the air breather system down to the bare carb top where you can look down in it. Looking straight down in the carb you should see gas squirt when you push back on the throttle. Crank and run the engine. Shut off the engine. Let it sit for the 8 hours. then look in the carb it should squirt gas. If it does not the problem is in the accleration system. the choke should also close after it has cooled the 8 hours. Either of these conditions will cause the problem you describe. Bill K
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Old 08-08-2011, 09:04:39 PM
Bob Shannon Bob Shannon is offline
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Default Re: Need Help With 79 Ford F250 Truck.

High temps could be boiling off the gas left in the carb after you shut the engine off due to the high alky content in the gas. Try different gas and maybe higher octane. Let us know what you find...

---------- Post added at 08:04 PM ---------- Previous post was at 07:59 PM ----------

Try opening the hood after you shut it off and see what happens when you start it again.....
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Old 08-08-2011, 09:05:25 PM
sqm1 sqm1 is offline
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Default Re: Need Help With 79 Ford F250 Truck.

Check the fuel pump the valves may not be sealing causing the fuel to drain back to the tank leaving the fuel lines empty.Also check to make sure all rubber hose are not cracked letting air to get in an fuel draining back

Joe
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Old 08-08-2011, 09:53:24 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Need Help With 79 Ford F250 Truck.

You might also have a look at the accellerater pump in the carb. If it is the diaphram type, alky will harden the neoprene it is made of, and it will not function as it is supposed to. If it has cracks, it will allow air to enter the accellerater system, causing the symptoms you describe. Having a look at the choke/enrichment system is not a bad idea either. If the choke is not closing properly, the engine will stumble on accelleration, until the engine gets hot.

Andrew
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Old 08-09-2011, 07:29:23 AM
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grub54891 grub54891 is offline
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Default Re: Need Help With 79 Ford F250 Truck.

Spark,compression,fuel.Sound's like a fuel problem.Change out the fuel filter,and the pump.If it still does it rebuild the carb.Also make sure all the lines are ok.That should do it!
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Old 08-09-2011, 05:59:08 PM
BobRR BobRR is offline
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Default Re: Need Help With 79 Ford F250 Truck.

Problem one Definitely sounds like accelerator pump or linkage,also if it has a power valve change it. I would rebuild carb. first and look for vacuum leaks. second problem maybe the egr valve? Bob
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Old 08-11-2011, 11:50:08 AM
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AndyG AndyG is offline
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Default Re: Need Help With 79 Ford F250 Truck.

Find a different mechanic. If all he does is take it off of the engine and put it on a work bench. Have you checked for proper function of the choke? Is it an automatic choke or manual. If automatic it should set itself to choke closed + fast idle after the pedal is pushed to the floor one time and released. Carbureted engines need some choke even in warm weather. If the choke and fast idle are set correctly you should not need to pump the accelerator while starting.
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Old 08-11-2011, 01:12:46 PM
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Default Re: Need Help With 79 Ford F250 Truck.

You can take the top off the carb while it is still on the truck. Let it set for a few hours, then take the top off. If there is fuel in it, (close to the top), then it is either choke or accelerator pump. If there is little to no fuel, then it is purculating out or is draining back into the tank via the fuel pump.
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