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1969 C10 pickup chugging or Choking at 50+mph


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MaxC10
New User

Jun 29, 2015, 10:58 AM

Post #1 of 4 (753 views)
1969 C10 pickup chugging or Choking at 50+mph Sign In

I have a 1969 Chevy C10 that I recently purchased, 307 V8 2bbl carb, 4 speed manual. It runs great up to 50 mph but then it starts to choke and chug until I get back below 50 mph it also seems to be worse going uphill. I had to replace the fuel pump and fuel lines before it would run. The new soft fuel lines are kind of flat from being in a roll and I am wondering if that could be contributing to the problem or if it has something to do with the carb? Any suggestions on best solutions? Replace soft fuel lines with something more "open", fuel system cleaners, rebuild carb? Thanks!


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jun 29, 2015, 11:22 AM

Post #2 of 4 (748 views)
Re: 1969 C10 pickup chugging or Choking at 50+mph Sign In

This will have to beckon lots of ideas and suggestions:


Sorry for that fuel line. Can and should now use line where rubber is supposed to be fuel line rated for fuel injection that so far I can get go collapse like that so guess you have the right stuff just too old on a roll. Look for pressure and PCV or rated to hold vacuum and it shouldn't collapse. Yes - truck is using more fuel the faster you go.


The real best would be to make up and properly use metal line especially from fuel pump to carb. Some of the vintage did boil fuel if quite hot out usually when stopped after a good run upon take off then snap out of it.


Carb should be at least checked out, cleaned and a rebuild nice if you are up to it. DON'T LOSE DINKY PARTS OR FORCE ANYTHING. You can if careful and it's basically good now take just the top off for a good look but don't if you really don't know how.


How many vacuum pull offs does this have and do they both hold vacuum now? You'll need carb #s to get new ones if failed, both can cause lousy cold running and if one at rear may limit how far throttle can open till warmed up always thinking it's cold no matter the temp.


Is this new engine much newer and really a 307 original? They look a lot alike Chev to chev real small blocks. Olds soon took over the exact CID # and Chev's was then a 305 later. Totally different engines either was used in many GM cars of assorted divisions later in the 70s. Know what you have as best you can,


T



MaxC10
New User

Jul 2, 2015, 12:54 PM

Post #3 of 4 (711 views)
Re: 1969 C10 pickup chugging or Choking at 50+mph Sign In

Thank you for the time you took for your response Tom. I replaced the "flat" fuel line I had with one that had a better shape to it and it seems to have solved the problem.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jul 2, 2015, 1:57 PM

Post #4 of 4 (707 views)
Re: 1969 C10 pickup chugging or Choking at 50+mph Sign In

Can't argue with that. Come back if you ever need to get into the carb. Did some untold # of them. When right they are just fine,


T







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