Patrick R Posted March 11, 2022 Share Posted March 11, 2022 Hello, I am wanting to install a locking fuel cap on my 2001 Diplomat LE. Does anyone know if I need an unvented or vented cap? Link to comment Share on other sites More sharing options...
Schreyert Posted March 11, 2022 Share Posted March 11, 2022 (edited) I went vented, non-locking. If its a plastic style like my '01 Dip... Gates 31615D should be your non-locking part number. Amazon, or Auto Parts Stores. Should be able to cross that number into a locking equivalent. Edited March 11, 2022 by Schreyert 1 Link to comment Share on other sites More sharing options...
Georgia Mike Posted March 11, 2022 Share Posted March 11, 2022 I would like to get a locking fuel cap as well for my Dynasty. Only one of the bay doors on both sides of the fuel tank lock. Has anyone found a locking cap for these tanks? Link to comment Share on other sites More sharing options...
RVhorod Posted March 11, 2022 Share Posted March 11, 2022 If the fuel cap is threaded like mine it is probably non-vented. I found a locking cap at a local truck parts supply house. Link to comment Share on other sites More sharing options...
Patrick R Posted March 11, 2022 Author Share Posted March 11, 2022 49 minutes ago, Georgia Mike said: I would like to get a locking fuel cap as well for my Dynasty. Only one of the bay doors on both sides of the fuel tank lock. Has anyone found a locking cap for these tanks? I believe they make locking covers for your fuel caps. They go over your cap and just spin unless you unlock it and take it off. The ones I see are kind of pricey. Link to comment Share on other sites More sharing options...
Joe E. Posted March 17, 2022 Share Posted March 17, 2022 https://www.fillernecksupply.com/copy-of-aluminum-2-npt-threaded-filler-neck-pipe-sections-choose-length/ Joe E. 08 Amb Link to comment Share on other sites More sharing options...
Dale N Posted May 31, 2022 Share Posted May 31, 2022 Just replaced the caps on my 03 HR Neptune and used Autozone Duralast #5791. $18.01 each and seems to work well. Problem is they are not keyed the same and also use a different keyway. I color coded them so I know which is which. Dale N 03 Neptune Link to comment Share on other sites More sharing options...
Dr4Film Posted June 1, 2022 Share Posted June 1, 2022 On 3/11/2022 at 7:51 AM, Patrick R said: Hello, I am wanting to install a locking fuel cap on my 2001 Diplomat LE. Does anyone know if I need an unvented or vented cap? Patrick, a photo of what you have now would help us to determine if you have a vented or non-vented fuel cap. You don't want to replace a non-vented cap with a vented one otherwise you will possibly have diesel flowing out of the vents someday. The brass caps on my fuel tank are non-vented and non-locking. Link to comment Share on other sites More sharing options...
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