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#26 |
Registered User
Join Date: Jul 2007
Location: Toppenish, WA
Posts: 15,507
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Re: Stumbling after 20 miles of driving
There is no possible way that you can have a pressure build up in that tank except when it is sitting in the sun and heat. You have one line out and no lines in.
If it still stumbles when you leave the cap off the sock on the pickup tube is probably full of dirt or trash. And I don't care if it is a brand new out of the box vented cap, unless you have tested it it is still suspect. As I stated earlier, I went through three brand name caps that were even marked vented but none of them would vent. I finally got a winner with the fourth one off the same parts shelf with the same parts number. One other thing it could be is that the inside of the hose between the line and the tank is collapsed inside and sucks in and blocks off the fuel. |
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#27 |
Registered User
Join Date: Nov 2009
Location: Triangle area of NC
Posts: 67
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Re: Stumbling after 20 miles of driving
I'm done posting in this thread. If any of the people that were following along want to know what I find tomorrow feel free to send me a PM. I'm not going to continue participating in a pointless argument.
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#28 |
Registered User
Join Date: Jul 2009
Location: Russellville, Arkansas
Posts: 1,699
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Re: Stumbling after 20 miles of driving
I had problems with dried hardened fuel flaking off the hard fuel line and plugging my sintered bronze fuel filter in the QJ carb. It looked like rolled up brown rice paper. I guess you'd call it shellac. This caused it to stall, sputter at higher speeds, but if I pulled over or slowed down and idled a little, it would clear up until I sped up again. Happened three orfour times. Just had to clean the bronze filter. Take your plastic filter off and check the inlet side for blockage. Mine happened after sitting 13 years with old gas in it. Good luck.
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#29 |
Registered User
Join Date: Nov 2008
Location: Glenville, Pa
Posts: 445
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Re: Stumbling after 20 miles of driving
Could be your spark plug wires. I had a similar problem that would get worse as the motor got warm. One of my plug wires was arcing against the block.
__________________
http://67-72chevytrucks.com/vboard/s...d.php?t=355153 |
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#30 | |
I really hate wet sanding!
![]() Join Date: Dec 2008
Location: Brookfield, MO
Posts: 601
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Re: Stumbling after 20 miles of driving
Quote:
__________________
Jeff, 68 C-10 75 C-20, now a C-10! 10 F-150 |
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