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Old 02-27-2006, 11:06 PM   #1 (permalink)
dtreid
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Making a venting fuel cap

How do I make my fuel cap fully venting? I bought what was suppost to be the correct one from GM, but it still holds vacuum in the tank.

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Old 02-27-2006, 11:07 PM   #2 (permalink)
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Simplest way? remove the O-Ring in the cap at top of threads.

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Old 02-27-2006, 11:08 PM   #3 (permalink)
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I learned this the hard way after taking a dremel and removing the plasctic center, spring and plunger in the cap of my original.
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Old 02-28-2006, 09:03 AM   #4 (permalink)
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I used a Harley Sportster cap I had laying collecting dust. I had drilled 4 small holes in the center plastic when I was racing the Sportster. I can blow both ways through it with no restriction.
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Old 02-28-2006, 01:39 PM   #5 (permalink)
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vaccum in the fuel tank

How often does this happen to these trucks. Is this a rare thing or should everyone try to vent the tank cap? I never heard of this before. Gasoline cars usually develop pressure in the tank instead of a vaccum, I think. Why does Diesel have a vaccum?
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Old 02-28-2006, 10:26 PM   #6 (permalink)
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gas forms pressure due to the volatility of it. try pouring gas on the ground, pour a likewise amount of diesel on the ground and wait 2 c which one evaporates into the atmosphere 1st. evaporating causes expansion by turning into gaseous versus liquid form. and it happens faster with a sloshing tank. it's also why the oil industry put those little rubber cups on the fuel nozzle when filling up. they slow the transition from liquid to a gaseous state.
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Old 03-01-2006, 07:39 AM   #7 (permalink)
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Quote:
Originally Posted by BigPappa View Post
How often does this happen to these trucks. Is this a rare thing or should everyone try to vent the tank cap? I never heard of this before. Gasoline cars usually develop pressure in the tank instead of a vaccum, I think. Why does Diesel have a vaccum?
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Old 03-01-2006, 07:39 AM   #8 (permalink)
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Quote:
Originally Posted by BigPappa View Post
How often does this happen to these trucks. Is this a rare thing or should everyone try to vent the tank cap? I never heard of this before. Gasoline cars usually develop pressure in the tank instead of a vaccum, I think. Why does Diesel have a vaccum?
FAQ's has
__________________
Look here-> GM 6.5 Reference Material & FAQ's <-Look here

Diagnostic Links & Common Failures: Turbo System * Lift Pump/OPS * PMD * Stalling


°Please include your vehicle details in your signature line. Did you read the FAQ's and search before posting?
*Bus 1, rest in peace. Bone stock, now just bones. 4.10 rear 10/13 mpg, 182,000 miles with a set of MCI motor coach seats.
*Currently driving an "Canadian Camo" Snow White 2001 5.7L Chevy Express.
*Bus 2, 99 7.3L PSD.
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Old 03-01-2006, 07:39 AM   #9 (permalink)
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Quote:
Originally Posted by BigPappa View Post
How often does this happen to these trucks. Is this a rare thing or should everyone try to vent the tank cap? I never heard of this before. Gasoline cars usually develop pressure in the tank instead of a vaccum, I think. Why does Diesel have a vaccum?
FAQ's has a l
__________________
Look here-> GM 6.5 Reference Material & FAQ's <-Look here

Diagnostic Links & Common Failures: Turbo System * Lift Pump/OPS * PMD * Stalling


°Please include your vehicle details in your signature line. Did you read the FAQ's and search before posting?
*Bus 1, rest in peace. Bone stock, now just bones. 4.10 rear 10/13 mpg, 182,000 miles with a set of MCI motor coach seats.
*Currently driving an "Canadian Camo" Snow White 2001 5.7L Chevy Express.
*Bus 2, 99 7.3L PSD.
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Old 03-01-2006, 07:39 AM   #10 (permalink)
knkreb
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Quote:
Originally Posted by BigPappa View Post
How often does this happen to these trucks. Is this a rare thing or should everyone try to vent the tank cap? I never heard of this before. Gasoline cars usually develop pressure in the tank instead of a vaccum, I think. Why does Diesel have a vaccum?
FAQ's has a link

__________________
Look here-> GM 6.5 Reference Material & FAQ's <-Look here

Diagnostic Links & Common Failures: Turbo System * Lift Pump/OPS * PMD * Stalling


°Please include your vehicle details in your signature line. Did you read the FAQ's and search before posting?
*Bus 1, rest in peace. Bone stock, now just bones. 4.10 rear 10/13 mpg, 182,000 miles with a set of MCI motor coach seats.
*Currently driving an "Canadian Camo" Snow White 2001 5.7L Chevy Express.
*Bus 2, 99 7.3L PSD.
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