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Mod | | | Forums66 Topics128,053 Posts1,055,776 Members48,426 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2006 Posts: 2,393 Shop Shark | | Shop Shark Joined: Sep 2006 Posts: 2,393 | The gas tank is building up back pressure because there isn't a way for the tank to vent off. It could be the narrow relief line on the filler neck is plugged or it could be something as simple as you holding the fuel nozzle too tight into the fill neck of your truck. Fuel back pressure increases with high air temperature too. I assume it's reasonably warm in Costa Rica.
Drew
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