 Help with fuel tank venting |
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| flipb |
 May 15 2020, 08:31 AM
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Senior Member  Group: Members Posts: 1,784 Joined: 2-September 09 From: Fairfax, VA Member No.: 10,752 Region Association: MidAtlantic Region 
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I replaced the seal under the fuel cap a few years ago, and I recently realized that the fuel tank is forming an airtight vacuum as it drains. In fact I recently burned out and replaced a fuel pump, and in hindsight, I realized it probably burned out due to pulling against vacuum pressure in the tank.
When I remove the gas cap after a drive, there is a very noticeable suction. My question is: What's the proper routing for charcoal canister and fuel tank ventilation? I'm running carbs on a 2056cc engine. Photo here of the canister... the other end of the hoses seem to be loose/uncapped in the engine bay but could be kinked/blocked somewhere.  |
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| Mikey914 |
May 15 2020, 08:58 AM
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#2
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The rubber man Group: Members Posts: 12,745 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None
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The expansion tank should allow the pressure to equalize. Is something capped off? Or more than likely restricted / pinched. If it had no venting you would eventually just get to the point the pump would have cavitation.
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Posts in this topic
flipb Help with fuel tank venting May 15 2020, 08:31 AM
ClayPerrine The other end of the hoses in the engine compartme... May 15 2020, 12:02 PM
flipb
The other end of the hoses in the engine compartm... May 15 2020, 12:59 PM ClayPerrine
Thanks, super helpful. I think the entire tank... May 15 2020, 01:36 PM Mikey914 Could be it.
You are running a return line back to... May 15 2020, 12:59 PM flipb
Could be it.
You are running a return line back t... May 15 2020, 01:11 PM bbrock Definitely hook up the vapor lines like Clay says ... May 15 2020, 01:12 PM |
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