Water in the tanks

[Schllc]

9 hours ago, Pinecone said:

Hmm, does installing them get rid of that stupid spring loaded flap????

Are you talking about the locking tab when you close the cap?

[Fly Boomer]

38 minutes ago, Schllc said:

Are you talking about the locking tab when you close the cap?

I can answer.  It has nothing to do with the cap.  Once the cap is removed, there is a flat plate blocking access to the tank.  The plate is hinged on one side, and spring-loaded to remain "up".  To stick the tank or even get a look into the tank, you have to overcome a fairly powerful spring to hold the flap down.  PIA

EDIT:  I think it's an anti-siphon aid.  If you forget the cap, the fuel only siphons out half as fast.

[wombat]

I thought the flap was added with the long-range fuel STC to reduce the speed of fuel flow into the main tank when the fuel level in the aux (Outer) tank is above the level of the main tank filler neck.  Otherwise it'd be really easy to fill the aux tank and then have it just start flowing out of the main's filler onto the ground.

[kortopates]

I thought the flap was added with the long-range fuel STC to reduce the speed of fuel flow into the main tank when the fuel level in the aux (Outer) tank is above the level of the main tank filler neck.  Otherwise it'd be really easy to fill the aux tank and then have it just start flowing out of the main's filler onto the ground.

No, anti siphon valves are standard.


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[Schllc]

5 hours ago, Fly Boomer said:

I can answer.  It has nothing to do with the cap.  Once the cap is removed, there is a flat plate blocking access to the tank.  The plate is hinged on one side, and spring-loaded to remain "up".  To stick the tank or even get a look into the tank, you have to overcome a fairly powerful spring to hold the flap down.  PIA

EDIT:  I think it's an anti-siphon aid.  If you forget the cap, the fuel only siphons out half as fast.

Then all that  would be removed if you have the Shaw caps. I’m not familiar with all the different types on mooney”s over the years. 
the entire old collar,neck and cap are an assembly. 

[Fly Boomer]

9 hours ago, Schllc said:

Then all that  would be removed if you have the Shaw caps. I’m not familiar with all the different types on mooney”s over the years. 
the entire old collar,neck and cap are an assembly. 

All four of mine are Shaw 531s.  So the Newton caps would get rid of the flapper thingy?  A few years ago, Maxwell said he could get rid of the anti-siphon devices, but I don't remember how.

[Pinecone]

21 hours ago, wombat said:

I thought the flap was added with the long-range fuel STC to reduce the speed of fuel flow into the main tank when the fuel level in the aux (Outer) tank is above the level of the main tank filler neck.  Otherwise it'd be really easy to fill the aux tank and then have it just start flowing out of the main's filler onto the ground.

Nope.  The connection from the aux to main is a -4 fitting.  So that limits flow.  It takes a while for the fuel to move from the aux to the main.  

The way I fill now is to fill the aux, then the main, put on the main cap, then top off the aux.

[Marc_B]

On 5/30/2025 at 1:17 PM, Pinecone said:

The way I fill now is to fill the aux, then the main, put on the main cap, then top off the aux.

Wouldn't filling up mains, then aux allow pretty much the same?  Or better yet, mains then aux on one side, same on the other, then come back and top off the aux again on the first side then do the same for the other side...

[wombat]

When I'm filling up, I do main, aux, main, aux, then put the main cap on and switch to the other side.

Then with as much time as I feel like putting into it, I'll just go back and forth topping off the aux tanks.  I've gone back and forth for about 30 minutes and it still wasn't done. I've gotten 52.5 gallons in that I've measured fairly accurately, but I think I could probably get another 5 gallons in if I gave it enough time.

[skykrawler]

Even if the o-rings have been replaced - if the airplane is not hangered and left in the rain (in Seattle):

 

https://www.aircraftspruce.com/catalog/pspages/jpt_13-21885.php

or cheaper...

https://www.amazon.com/Multi-Purpose-Silicone-Microwave-Resistant-Dishwasher/dp/B083FK34M9/ref=asc_df_B083FK34M9?mcid=27f9543d2bd03a4bafead465603a80d3&hvocijid=7626931227964126913-B083FK34M9-&hvexpln=73&tag=hyprod-20&linkCode=df0&hvadid=721245378154&hvpos=&hvnetw=g&hvrand=7626931227964126913&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9008565&hvtargid=pla-2281435178058&th=1

 

 

....or something like that.

[Schllc]

Or “Cheapest”  which is probably better in wind…

https://www.amazon.com/ScotchBlue-PROSharp-Edge-Lock-2093-48EC/dp/B0DWF2V6DZ/ref=mp_s_a_1_5_sspa?crid=2LI609SB8WSG4&dib=eyJ2IjoiMSJ9.yHfaQtyGmgNb-Od6b1-i8NFTVabh4w7UeBy-nerlByzB_noMFrgpZfOHPdZ59RpfpNtky-CIGVP7MF_P7qZMc2eXTD39bEeaRisLZTo0wQKZARJh2uYqBSkUgNpUJngcgUwGRIbDJQPqtpZsXXDlY3Lu4OQ3yqdwfdHOkhcNUG5E75P_WsGMBzYBQA5vrrR90Ze1kDrzovwpqKSHG6qkgQ.N-J7fmzRt6vODL0LBiWm-8GqdlI9vfePxLyDNSk6IAQ&dib_tag=se&keywords=blue+painters+tape&qid=1748786232&sprefix=blue+painters+tape%2Caps%2C127&sr=8-5-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9waG9uZV9zZWFyY2hfbXRm&psc=1

[Marc_B]

https://www.aircraftspruce.com/catalog/pspages/jpt_13-21885.php

@skykrawler I've heard that these have a sticky back and aren't really made to use repeatedly.  They're also sticky enough it might pull off paint if not careful.

[Pinecone]

23 hours ago, Marc_B said:

Wouldn't filling up mains, then aux allow pretty much the same?  Or better yet, mains then aux on one side, same on the other, then come back and top off the aux again on the first side then do the same for the other side...

If you fill main with aux empty, fuel starts moving into aux.  So when you stop filling main and put on the cap, the level in the main is still going down.  So you fill the aux, but the main is not full, so the level in the aux goes down and leaves you short of full.

Filling aux first means fuel is moving from aux to main.  Then you fill the main, which reduces flow from aux to main.  So you then top the aux after doing the same to the other side and you are much closer to full.

[GeeBee]

4 hours ago, Marc_B said:

https://www.aircraftspruce.com/catalog/pspages/jpt_13-21885.php

@skykrawler I've heard that these have a sticky back and aren't really made to use repeatedly.  They're also sticky enough it might pull off paint if not careful.

I have those and they work, but if they pull your paint, you really need a new paint job.

The way to renew the sticky is to wash them in water. The sticky is what they use on gel lint rollers, the more contaminated they become the less they stick until you wash them.