STC fuel filler pipes for Ovation

[rickseeman]

I've heard of a Mooney STC for "vented" fuel filler standoffs (if that is the proper description) for the Ovation that allows for an extra 10 gallons of fuel. I guess when you do this you can fill the tank up like a normal tank instead of stopping when it gets to the bottom of the pipe. Does anyone have info on this? Or perhaps an STC number? I've searched, but because I really don't know what to call it, I've come up empty. TIA

[Niko182]

You can just keep on adding fuel past the fillers.

[Cruiser]

I believe what you are looking for is the 51 gallon fuel tanks AFM supplement. It allows a Total Capacity 108 gallons / Usable 102 gallons in M20M, M20R, and M20TN models. 
You will need to have one of the MSC order the kit

https://www.mooney.com/wp-content/uploads/2020/12/SUPP0006.pdf

[rickseeman]

Thank you. The way I read that is the vent is already there and I can get the 51 gallons in. All I need to do is order new fuel placards and do a new weight and balance?

[kortopates]

you’l also need the AFM in your POH, but no weight and balance change.

But your saying you filler necks already have the wedge vents with capacity markings? If so, great! But odd it’s missing the supplement and correct placards.


Sent from my iPhone using Tapatalk

[Cruiser]

2 hours ago, rickseeman said:

Thank you. The way I read that is the vent is already there and I can get the 51 gallons in. All I need to do is order new fuel placards and do a new weight and balance?

and have a logbook entry stating --- installed in accordance with Mooney Drawing Number 210217

p.s. - remember, Ovations have a maximum landing weight limit lower than MTOW. Be careful on fueling more than you use up before landing

. 

Edited December 31, 2022 by Cruiser

[LANCECASPER]

4 hours ago, rickseeman said:

I've heard of a Mooney STC for "vented" fuel filler standoffs (if that is the proper description) for the Ovation that allows for an extra 10 gallons of fuel. I guess when you do this you can fill the tank up like a normal tank instead of stopping when it gets to the bottom of the pipe. Does anyone have info on this? Or perhaps an STC number? I've searched, but because I really don't know what to call it, I've come up empty. TIA

That was what Mooney called Extended Range fuel tanks, not to be confused with Long Range fuel tanks (Monroy STC).

[rickseeman]

33 minutes ago, kortopates said:

you’l also need the AFM in your POH, but no weight and balance change.

But your saying you filler necks already have the wedge vents with capacity markings? If so, great! But odd it’s missing the supplement and correct placards.


Sent from my iPhone using Tapatalk

I wasn't saying I had the wedge vents. But the way I read it I thought it was insinuating that they were already there. It is placarded for 44.5 gal.

[kortopates]

18 minutes ago, rickseeman said:

But the way I read it I thought it was insinuating that they were already there.

No, what you read is the AFM (airplane manual supplement) that goes into your POH "after" you've had the modification, hence why it reads like it's there. This is provided by Mooney, therefore not an STC. Contact your favorite MSC to ask cost for installing it.

[rickseeman]

Will do. I tried Mooney but no answer, then tried LASAR but no answer.

[FlyingScot]

This is very interesting thread - but I don’t quite understand - is the extra capacity contingent on having some type of vent installed in the normal O filler neck, or is it simply an AFM change? Thanks. – Bob.

[rickseeman]

It's some small changes to go from 89 gal to 102 gal. The link from Cruiser above kinda explains it.

[Schllc]

I second the “interesting” comment. 
I am not familiar with the specific vents, and stc’s regarding turn differences from 41 gallon, 44gsllon and 52 gallon tanks…

But every long body I have had, has taken more fuel than the poh said it could hold. 
even the two with monroy tanks. It’s hard to say exactly how much more without draining the tanks, but there is no doubt they took more. 

[Niko182]

7 hours ago, Cruiser said:

I believe what you are looking for is the 51 gallon fuel tanks AFM supplement. It allows a Total Capacity 108 gallons / Usable 102 gallons in M20M, M20R, and M20TN models. 
You will need to have one of the MSC order the kit

https://www.mooney.com/wp-content/uploads/2020/12/SUPP0006.pdf

Did they ever make the kit for an S. I'd love to be able to legally remove the tabs if i could.

[Guest]

9 hours ago, FlyingScot said:

This is very interesting thread - but I don’t quite understand - is the extra capacity contingent on having some type of vent installed in the normal O filler neck, or is it simply an AFM change? Thanks. – Bob.

The changes involve adding new fuel placards to the fuel selector valve and the two wing filler ports. The addition volume already exists in the wing as do the NACA style fuel vents.

[FlyingScot]

10 hours ago, rickseeman said:

Will do. I tried Mooney but no answer, then tried LASAR but no answer.

If you find where this can be ordered, would you please post it - I would love to add this - thanks and Happy New Year!

[Schllc]

1 hour ago, FlyingScot said:

If you find where this can be ordered, would you please post it - I would love to add this - thanks and Happy New Year!

If all that’s involved is the placards, you can likely them placards on eBay, I found a fuel selector ring on there a few years ago for something like $30

[A64Pilot]

If it’s an STC, then you need the STC, or possibly a field approval if the STC is no longer viable.

[Cruiser]

the only physical change is replacing the placards, which (I believe) can be done by the owner/operator and adding the AFMS to your POH. 
Some feel that filling the volume above the tubes is too slow because the venting holes at the top of the filler ring are small. They have been known to be enlarged ...
Mooney long bodies came with three different length filler tubes. The longest was for M20S Eagles with a full indication at the bottom of the tube - 75 gallons. 
The middle length tube on most M20R Ovations equals 89 gallons when filled to the bottom of the tube. 
The shortest length tube (which is basically no tube) fills the wing tanks full to the 108/102 gallon useable fuel level. 

Just remember that the landing weight is less than the MTOW so you need to burn enough fuel to get below that restriction during the flight.

Edited December 31, 2022 by Cruiser

[Cruiser]

10 hours ago, Niko182 said:

Did they ever make the kit for an S. I'd love to be able to legally remove the tabs if i could.

not that I know of, the 310 HP STC includes increasing the fuel capacity of the M20S to 89 gallons. 

 

[rbp]

The only modification is removing the filler necks?  and changing the placards? 

[A64Pilot]

2 hours ago, rbp said:

The only modification is removing the filler necks?  and changing the placards? 

I don’t know squat about it, but it seems you can drill a hole and add a vent to that neck which would seem to accomplish the same as removal. Some aircraft (not necessarily Mooney’s) you can shoot fuel under the filler neck and overfill the tanks, not that i’ve ever done that.

But your changing the Type Certificate by changing fuel capacity unless factory drawings covering your serial number allow it, then if it’s an STC, you can’t just duplicate the work of an STC, you have to purchase it. An STC of course is an FAA change to the TC, something we aren’t allowed to do on our own.

It would have to be placards, a change to the manual and change to W&B as a min.

‘But I know nothing of this actually, but would bet money there may be aircraft flying around with vent holes in their filler necks without any STC

[rickseeman]

For those wanting more info on this topic I found this in a previous thread from 2016. I'm not sure of the kit cost.

I just went through legally converting from 89USG to 102USG about 7 months ago.  With the existing 44.5 necks, you're not prevented from filling to 51USG per se - you just need to work a bit longer to fill them to that (the newer necks have a mark at "44.5USG" on the lower filler opening, and a "51USG" marking on the upper portion).  We replaced the existing filler necks with two new ones, each having a V-shaped notch cut out below the filler openings to allow filling to the upper-lip without having to "burp" them as you fill over 44.5USG.

 The kit gets you the two metal necks, a couple of placards for the fuel caps, and a plastic ring corresponding to 51.0USG per side that replaces the one around the fuel shutoff valve on the floor.  Along with that, we re-calibrated the quantities and changed the JPI EDM900 to display 51USG per tank.

Folks who have 1994 through 1998 airplanes with the mechanical Sigma-Tek fuel quantity indicators who choose to legally convert to 102USG will need to find a way to display correct fuel quantity.  Not sure how or if you can change the quantity indication on the '99 through '04 Moritz gauges.

[Mark89114]

I have a 2000 ovation and the fuel fairy might put more in than recommended based on fuel pricing or distance to go but when I filled to the bottom of what people are call the tabs the gauges showed 2-3 gallons short.  I think there is a slot on one side of the filler, is that what we are calling a vent?  When the tanks are filled full-full I can get an extra 4-5 gallons but it takes a minute but I think I am a long way from this extra theoretical amount  44.5 to 51.  I know I have extra gas as the fuel totalizer shows fuel being used for about 4-5 gallons before the fuel gauges start moving.  I think my fuel gauges are very accurate, I don't trust them but on my long legs they seem to indicate accurately.  I don't see how any modifications to the fillers would be easy, I believe the whole contraption is riveted in place?    

[rbp]

On 12/31/2022 at 1:56 PM, rickseeman said:

For those wanting more info on this topic I found this in a previous thread from 2016. I'm not sure of the kit cost.

I just went through legally converting from 89USG to 102USG about 7 months ago.  With the existing 44.5 necks, you're not prevented from filling to 51USG per se - you just need to work a bit longer to fill them to that (the newer necks have a mark at "44.5USG" on the lower filler opening, and a "51USG" marking on the upper portion).  We replaced the existing filler necks with two new ones, each having a V-shaped notch cut out below the filler openings to allow filling to the upper-lip without having to "burp" them as you fill over 44.5USG.

 The kit gets you the two metal necks, a couple of placards for the fuel caps, and a plastic ring corresponding to 51.0USG per side that replaces the one around the fuel shutoff valve on the floor.  Along with that, we re-calibrated the quantities and changed the JPI EDM900 to display 51USG per tank.

Folks who have 1994 through 1998 airplanes with the mechanical Sigma-Tek fuel quantity indicators who choose to legally convert to 102USG will need to find a way to display correct fuel quantity.  Not sure how or if you can change the quantity indication on the '99 through '04 Moritz gauges.

"AIRPLANE FLIGHT MANUAL SUPPLEMENT FOR
MOONEY M20M, M20R, M20TN
WITH
51 GALLON CAPACITY USEABLE FUEL TANK CONFIGURATION INSTALLED

This Supplement must be attached to the FAA Approved Airplane Flight Manual when the 51 Gallon Fuel Tank configuration is installed in accordance with Mooney Drawing Number 210217"

does anyone have this drawing?