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PMO owners, Enlighten me please.

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Shivers	Nov 2 2026, 03:20 PM Post #1
Senior Member Group: Members Posts: 3,704 Joined: 19-October 20 From: La Quinta, CA Member No.: 24,781 Region Association: Southern California	PMO fuel pressure regulator. With the barbed nipples it is 8mm for all of them including the one for the stock size 9.5mm supply line. The AN6 fittings are 9.5. How did you get around this? This one has 8mm supply feeding two 8mm nipples to the carbs. Am I missing something, do they all need to be one size? I ve been all over town trying to find a 9.5 barbed fitting with no luck. I’d call PMO but I could only find a fax number. A little help would be great. Thanks

friethmiller	Nov 2 2026, 04:18 PM Post #2
Senior Member Group: Members Posts: 1,604 Joined: 10-February 19 From: Austin, TX Member No.: 22,863 Region Association: Southwest Region	QUOTE(Shivers @ Nov 2 2026, 03:20 PM) PMO fuel pressure regulator. With the barbed nipples it is 8mm for all of them including the one for the stock size 9.5mm supply line. The AN6 fittings are 9.5. How did you get around this? This one has 8mm supply feeding two 8mm nipples to the carbs. Am I missing something, do they all need to be one size? I ve been all over town trying to find a 9.5 barbed fitting with no luck. I’d call PMO but I could only find a fax number. A little help would be great. Thanks Yeah Shivers... I just hit this problem a few days ago. I have the same set up. In a pinch, I bought a male to male 3/8" barbed union and reduced the hose to a 5/16" just before the inlet side of my PMO regulator. This seemed to work and it certainly eliminated the leak I had when using the 3/8" hose directly. If the inlet barb could be increased in size, that would be the better solution for sure. From what I understand, 5/16" = 8mm and 3/8" = 9.5mm UPDATE: Amazon has the correct unions for a better reduction. Perhaps the inlet can be had as well. What's the threaded size of the inlet barb fitting?

friethmiller	Nov 2 2026, 04:43 PM Post #3
Senior Member Group: Members Posts: 1,604 Joined: 10-February 19 From: Austin, TX Member No.: 22,863 Region Association: Southwest Region	BTW, I figured out what PMO stands for .... Leaky Gas Box! Make sure all those fittings are tight.

Shivers	Nov 2 2026, 05:18 PM Post #4
Senior Member Group: Members Posts: 3,704 Joined: 19-October 20 From: La Quinta, CA Member No.: 24,781 Region Association: Southern California	QUOTE(friethmiller @ Nov 2 2026, 02:18 PM) QUOTE(Shivers @ Nov 2 2026, 03:20 PM) PMO fuel pressure regulator. With the barbed nipples it is 8mm for all of them including the one for the stock size 9.5mm supply line. The AN6 fittings are 9.5. How did you get around this? This one has 8mm supply feeding two 8mm nipples to the carbs. Am I missing something, do they all need to be one size? I ve been all over town trying to find a 9.5 barbed fitting with no luck. I’d call PMO but I could only find a fax number. A little help would be great. Thanks Yeah Shivers... I just hit this problem a few days ago. I have the same set up. In a pinch, I bought a male to male 3/8" barbed union and reduced the hose to a 5/16" just before the inlet side of my PMO regulator. This seemed to work and it certainly eliminated the leak I had when using the 3/8" hose directly. If the inlet barb could be increased in size, that would be the better solution for sure. From what I understand, 5/16" = 8mm and 3/8" = 9.5mm UPDATE: Amazon has the correct unions for a better reduction. Perhaps the inlet can be had as well. What's the threaded size of the inlet barb fitting? I was actually hoping someone here would know It's not pipe thread, I think it is metric but otherwise I'm clueless. Thanks for the leak tip. I have some good pipe dope for the threads

infraredcalvin	Nov 2 2026, 10:14 PM Post #5
Distracted Member Group: Members Posts: 1,781 Joined: 25-August 08 From: Ladera Ranch, CA Member No.: 9,463 Region Association: Southern California	They make that part with AN fittings… I’d bet you can remove the barb fitting and fit a proper AN sized to your liking…

frank_c	Nov 3 2026, 12:13 AM Post #6
Member Group: Members Posts: 119 Joined: 29-December 24 From: Austin, TX Member No.: 28,542 Region Association: None	QUOTE(infraredcalvin @ Nov 2 2026, 11:14 PM) They make that part with AN fittings… I’d bet you can remove the barb fitting and fit a proper AN sized to your liking… I went the AN route. No leaks after ~12 years (knock on wood).

Shivers	Nov 3 2026, 03:26 AM Post #7
Senior Member Group: Members Posts: 3,704 Joined: 19-October 20 From: La Quinta, CA Member No.: 24,781 Region Association: Southern California	QUOTE(friethmiller @ Nov 2 2026, 02:43 PM) BTW, I figured out what PMO stands for .... Leaky Gas Box! Make sure all those fittings are tight. I ordered one of these, I hope it fits. I ID’d the threads the best I could. It will be here tomorrow, I’ll let you know if it will work.

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Time is now: 3rd November 2026 - 03:41 AM