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Should a California emmessions equiped '70 Chevelle have a vented or a non-vented fuel tank cap???
Would it be a anti-surge type of fuel tank cap???
Would it be a anti-surge type of fuel tank cap???
'70 w/CALIFORNIA EMMESSIONS FUEL CAP
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If it has the charcoal canister hooked up in the engine bay to vent the fumes from the tank, then use a non-vented cap. If the lines have been plugged you will have to use a vented cap to keep from creating vacuum in the gas tank. The vented caps can also leak fuel when gas sloshes against it.
My 72 had the line running to the front but not the canister, so I plugged it. Then started getting fuel starvation issues due to vacuum from no vent. So I put a vented cap on, but it leaked gas when the tank was past half full. Then I put a filter on the line to open it without dirt getting in along with a normal non-vented cap. All has been good ever since.
My 72 had the line running to the front but not the canister, so I plugged it. Then started getting fuel starvation issues due to vacuum from no vent. So I put a vented cap on, but it leaked gas when the tank was past half full. Then I put a filter on the line to open it without dirt getting in along with a normal non-vented cap. All has been good ever since.
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I taked with an engineer from Stant last nite. He stated that the California emmission cap (P/N 10583 locking fuel cap) Stant makes "will vent", but it will take more pressure than the normal EEC cap (P/N 10492 locking fuel cap) to vent.
He also stated that the cap vents thru the valve in the middle, pointing towards the inside of tank.
With this said P/N 10583 could be turned into a non-vented (non-leaking) gas cap if some epoxy was applied to seal the face of the valve.
He also stated that the cap vents thru the valve in the middle, pointing towards the inside of tank.
With this said P/N 10583 could be turned into a non-vented (non-leaking) gas cap if some epoxy was applied to seal the face of the valve.
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