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05-03-2024, 06:32 PM | #1 | |
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Join Date: Sep 2019
Location: Scottsdale Arizona
Posts: 114
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Re: 1973-1991 Dual fuel tank systems theory of operation
Quote:
How would a charcoal canister keep gas from spewing out of the tanks? |
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05-03-2024, 09:38 PM | #2 |
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Join Date: Sep 2019
Location: Scottsdale Arizona
Posts: 114
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Re: 1973-1991 Dual fuel tank systems theory of operation
I spent a bit of time after work today troubleshooting. I started the truck up running on the left tank, and removed the gas cap. After a few minutes, I can see the gas level rising up through the fill port, until eventually it starts spilling out the fill port on the left tank.
Once that happened, I removed the power wire from the selector switch that feeds the left tank, so only the right tank was hooked to the switch, and started up again. Same result I disconnected the two vents where they tee together and plugged them off to rule out fuel somehow crossing from one tank to the other via the breather hose, and same result. Finally, just for ****s and giggles, I swapped the return lines at the fuel selector valve, and same result. I have no idea wtf is happening. |
05-04-2024, 12:21 PM | #3 | |
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Location: Pensacola, FL
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Re: 1973-1991 Dual fuel tank systems theory of operation
Quote:
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Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3 |
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05-04-2024, 12:24 PM | #4 |
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Location: Scottsdale Arizona
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Re: 1973-1991 Dual fuel tank systems theory of operation
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05-16-2024, 10:52 AM | #5 |
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Join Date: Sep 2011
Location: Canada
Posts: 86
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Re: 1973-1991 Dual fuel tank systems theory of operation
Great info in here! It is nice to know I can ditch the earlier problematic switch with the simple 2-position switch from the newer trucks. I'm hoping to get my second tank operational sometime this year. I have a feeling I should pick up the switch and a new valve at minimum, then go from there. The entire 10 years I have owned the truck I am not even sure what is in the left tank if anything lol.
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