Re: Motorcraft 4350 carb
08-14-2003, 09:57 AM
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Re: Motorcraft 4350 carb
Starting issues after sitting are 'usually' one of two things.
Either the gas filter is in upside down or there is a pinhole leak in
the gas line on the suction side of the fuel pump.
The gas filter has two outlets, the center outlet goes to the carb and
the top outlet goes to the return line. If the return line isn't at the
top, then gas can syphon back to the tank when it sits making it a
bugger to get going.
A pinhole leak does the same. It can be small enough that the suction
won't let gas leak, but it will let air in when off. It just leaves a
small stain on the gas line.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Tom Dobrowolsky wrote:
>
> The 4350 carb in my project J-10 (360 engine) is having some starting
> issues and, from a visual inspection, looks like it could use a cleaning
> and rebuilding. (I bought the truck used and don't know when it was
> last cleaned/adjusted/rebuilt/etc.) It takes a few attempts to start
> the truck up after it's been sitting a while. When it starts, it
> sputters for a few seconds, almost dying unless I gently touch the
> gas. However, once I start it up and let it run a bit, restarting it is
> surprisingly effortless. It seems to run like a champ then. The last
> couple of times I had it running, I sprayed a bunch of carb cleaner into
> the intake; maybe that helped.
>
> Perhaps I should just replace the fuel filter, tend to the stuff
> around the carb, and leave the beasty alone? This is my first plunge
> into the truly fantastic world of carburetion so I'm fishing for
> opinions. What other things should I be looking at?
>
> From all that I've read, people seem to approach these things with holy
> water and a priest to excorcise the thing before working on it...if they
> decide to touch the thing at all. I'm wondering whether or not I should
> just get my hands on a different carb. I've seen that Summit Racing sells
> a -------bore-to-square-bore adaptor plate. Assuming I replace it some
> day, what carb would be a suitable replacement?
>
> Cheers,
> /tom
>
> --
> ( ( ( ( ( ( ( ( ( ( * ) ) ) there is no antelope ) )
> |
> Rev. Tom Mary Dobrowolsky | The Information School
> http://students.washington.edu/agent /-\ University of Washington
Either the gas filter is in upside down or there is a pinhole leak in
the gas line on the suction side of the fuel pump.
The gas filter has two outlets, the center outlet goes to the carb and
the top outlet goes to the return line. If the return line isn't at the
top, then gas can syphon back to the tank when it sits making it a
bugger to get going.
A pinhole leak does the same. It can be small enough that the suction
won't let gas leak, but it will let air in when off. It just leaves a
small stain on the gas line.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Tom Dobrowolsky wrote:
>
> The 4350 carb in my project J-10 (360 engine) is having some starting
> issues and, from a visual inspection, looks like it could use a cleaning
> and rebuilding. (I bought the truck used and don't know when it was
> last cleaned/adjusted/rebuilt/etc.) It takes a few attempts to start
> the truck up after it's been sitting a while. When it starts, it
> sputters for a few seconds, almost dying unless I gently touch the
> gas. However, once I start it up and let it run a bit, restarting it is
> surprisingly effortless. It seems to run like a champ then. The last
> couple of times I had it running, I sprayed a bunch of carb cleaner into
> the intake; maybe that helped.
>
> Perhaps I should just replace the fuel filter, tend to the stuff
> around the carb, and leave the beasty alone? This is my first plunge
> into the truly fantastic world of carburetion so I'm fishing for
> opinions. What other things should I be looking at?
>
> From all that I've read, people seem to approach these things with holy
> water and a priest to excorcise the thing before working on it...if they
> decide to touch the thing at all. I'm wondering whether or not I should
> just get my hands on a different carb. I've seen that Summit Racing sells
> a -------bore-to-square-bore adaptor plate. Assuming I replace it some
> day, what carb would be a suitable replacement?
>
> Cheers,
> /tom
>
> --
> ( ( ( ( ( ( ( ( ( ( * ) ) ) there is no antelope ) )
> |
> Rev. Tom Mary Dobrowolsky | The Information School
> http://students.washington.edu/agent /-\ University of Washington
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