Fuel Delivery Problems
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Fuel Delivery Problems
Hey guys, I have a 1969 F100 that I have had since my freshmen year of high school. I have done lots of work and improvements in the past 4 years, including switching from the original 3-on-the-tree transmission to a 4 speed t-18, and rebuilding a junk yard 300ci I-6 and swapping it with the original 360ci V-8.(I am rebuilding the 360 which had just over 100,000mi on it and I plan to swap it back) Anyway, I dropped the new engine in last June and it has been a dream ever since, until about a month ago when it started flooding like crazy. Fuel runs all down the carburetor and down intake manifold. When I remove the carb, there is fuel pooling inside the manifold. I first checked the needle valve on the carb because I figured it had failed, I went a head and rebuilt the carb. The problem was back within 15 miles. Next I checked the pressure that the fuel pump was delivering and found it to be correct. I put a second carb that I had on to see if it would make any difference, and it got me from Denver to Fort Collins (60 mies), but I was began getting trouble again inside the city, and now I’m back to where I started. Any ideas, I’m stumped.
Fleet Mechanic
Joined: Aug 2007
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From: Piney Woods of East Texas
Is sounds like the float is taking on fuel? When you take it apart, shake the float and see if you feel fuel in it. And Or submerge in fuel and see if you see bubbles.
Is the level to high?
Is the level to high?
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That occured to me too, however I have a brass float and it seemed to be solid when I rebuilt the carb. It is an old carter YF model and I found the foat specs in a book I have and I adjusted it a little, but it was not a big enough adjustment to account for the problem in my mind. Thanks though, any other ideas?
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Yah, the float was good, no fuel inside and it didnt bubble when I put it in water. I am in Colorado, and I was wondering if the jets could be the issue, however that dosent explain why it would run well and suddenely fail like this.
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well no, my orignal thought was something obstructing my needle valve, but i took it apart and everything was clean. i went a head and rebuilt it anyway b/c i had the kit and and put in a new needle valve then. plus the 2ed carb i tried was one that my dad had that he bought newly remanufactured a few years ago. and the problem was eventualy back.
i just ordered a pressure regulator to attach to my fuel line, it was only a cupple of bucks and it seems like the pressure in the line is overwhelming the valve. what do you think?
i just ordered a pressure regulator to attach to my fuel line, it was only a cupple of bucks and it seems like the pressure in the line is overwhelming the valve. what do you think?
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Fleet Mechanic
Joined: Aug 2007
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From: Piney Woods of East Texas
It's possiable but not likely with most pumps. Another possiable, is the retainer that holds the rod down for the float allowing it to lift up. It's been a long time since I have been in that model, does it use a casting in the lid to hold it down or the wire loop connecting to the seat.
On most float adjustments there are 2 settings, closed with the float level to the lid. And drop. Is the tilt of the engine putting the float in a position that it's not applying pressure. Like the tab is set for level but the float is not in the correct position, cocked.
Just sounding off.
On most float adjustments there are 2 settings, closed with the float level to the lid. And drop. Is the tilt of the engine putting the float in a position that it's not applying pressure. Like the tab is set for level but the float is not in the correct position, cocked.
Just sounding off.
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There is a casting in the lid. I have it adjusted right, I'm not sure what it is. I'm having a real pain in the *** too because I'm at school now and the place I'm living in now does not have a garage and it is cold as ****. I guess I'll just have to keep trying, I'll take the carb apart again and let you know about the retainer. Let me know if you think of anything else. Thanks
Postmaster
Joined: Sep 2004
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From: wi
300 carbs are known to loosen up remove the carb tip it upside down and retighten the screws that hold it all together. if that dont work auto zone can get ya a replacement carb for less then youd think or rebiuld that one
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I was kinda noticing that with the screws, but I sort of thought it was just me. I have already rebuit one of the carbs and the other has never been used untill now. I'll have some time today and tomorrow to work on it, so hopefuly I can get her going.