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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

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  #1  
Old 02-22-2014, 08:47 AM
69'er 69'er is offline
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Another carburetor question

Hoping for a few more good responses like I received on my last issue! Thanks again all! 69 F-250 with a recently rebuilt 390. Timing and dwell are spot on. The carburetor is a Motorcraft 2 bbl factory rebuild. I've checked the wet fuel level while warmed up and running and it's good. The motor has not backfired since the rebuild. It started up and has run smoothly since it was first installed. It starts and runs great when it's cold. The problem is when it has been shut down after warming up and I try to start it again. Then it requires a lot of cranking- like it's flooded. However it is not flooded. Also sometimes after it's started and I begin to drive it will stall out and again be difficult to restart. It also stumbles a bit on taking off from a stop or accelerating from a low rpm. No doubt it's something simple I'm overlooking but it has me bumfoozled! Any suggestions would be much appreciated. The old truck has been my primary transportation for 25 years and I'd like to have it healthy again!
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Old 02-22-2014, 11:46 AM
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Sounds like not enough fuel getting to the carb once the engine is hot. This could be plugged fuel filter, weak fuel pump, or vapor lock. When it stalls I bet if you look down the throat of the carb and work the throttle you won't see the accelerator pump nozzles squirting any gas like they are supposed to.
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Old 02-22-2014, 02:20 PM
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Ok, thanks Jeff. I have a new filter that I'll try first. It makes sense. The pump is only about a year old but nothing would surprise me.
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Old 02-22-2014, 06:29 PM
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Well, it's not the filter and still am not sure about the pump. It is delivering fuel during the slow start-up but it's possible by the time I pull the breather that the pump has recovered. I'm doubting vapor lock. It wasn't a problem prior to the rebuild and this can happen after a 5 mile drive in very cold weather. I believe the pump is getting a good fuel supply judging from the flow when I disconnected it before removing the motor. When I have a few minutes again I'll disconnect the carburetor and pump the gas into a container to see how that goes.
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Old 02-23-2014, 07:03 AM
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When it's warm and you try to restart, do you give it a pedal press or just turn the key?
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Old 02-23-2014, 07:55 AM
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I just turn the key Rasputin unless I see that it's not going to start. In the beginning I tried about everything knowing I'd have to adjust to a new carburetor. If it hasn't set too long after turning it off it will start right up. After maybe 10 minutes it's anyone's guess what it will do.
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Old 02-23-2014, 02:56 PM
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I had a similar issue...turned out to be a bad coil. I thought it was the carb-but as that coil heated up in a few minutes-stall out. Never could tell when it was going to fire up again.
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Old 02-23-2014, 04:10 PM
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Thanks for the reply Matson but I don't think it's a coil getting heated up. The truck will always start but at certain times it just takes longer. I've had bad coils in the past too but this is different. Once the truck is running it doesn't stall except once in a great while it will stall shortly after a difficult start-up
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Old 02-24-2014, 06:38 AM
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Is it an automatic choke?
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Old 02-24-2014, 08:42 AM
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No, it's a manual choke Rasputin.
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Old 02-24-2014, 10:20 AM
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na na na na na
Unhappy hard start

69er, Make sure that the "I" terminal on the solenoid is hot when in cranking mode and that the same voltage is present at the "BAT" side of the coil also.
It also may be caused by the aging of the wiring, it gets frail, just like us.
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Old 02-24-2014, 10:35 AM
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Well, I'm thinkin' if the fuel delivery system IS getting fuel to the carb then the carb must not be giving it to the engine. You said factory rebuilt. So I'm assuming you bought a rebuilt carb. We don't know why someone had originally taken this carb off their vehicle. You checked fuel (bowl) level and it was correct. So one of the carb's internal passages is holding fuel back when it's hot. The key here seems to be heat. I am also assuming the rebuilt carb came with a real thin gasket that will transmit engine heat to the carb. I would buy a thick carb gasket like the later model vehicles came with and try that. Ford part number was E5HZ9C477A.
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Old 02-24-2014, 11:24 AM
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Quote:
Originally Posted by 69'er View Post
I just turn the key Rasputin unless I see that it's not going to start. In the beginning I tried about everything knowing I'd have to adjust to a new carburetor. If it hasn't set too long after turning it off it will start right up. After maybe 10 minutes it's anyone's guess what it will do.
I've got a very similar issue with my truck... After it's somewhat warmed up, I can shut it down for 10 - 15 minutes and it will act up. Usually it fires up, then stalls. The first couple times it happened, I was sure it was the typical hot start/possible flooding issue. I held the pedal to the floor, but all it would do was crank away and would not catch. Finally got mad and pumped the pedal a few times and it fired right up. I still haven't figured out what exactly is going on, it seems like a fuel delivery issue of some sort.

Will keep an eye on this thread to see what you figure out.
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Old 02-24-2014, 11:24 AM
 
 
 
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